如何从文件扩展名中获取 MIME 类型？
对于 ASP.NET 或其他
这些选项在 ASP.NET Core 中进行了一些更改，如下所示 (credits)：
new FileExtensionContentTypeProvider().TryGetContentType(fileName, out contentType); （仅限 vNext）从未测试过，但看起来您可以通过公开的 Mappings 属性正式扩展 mime 类型列表。
从未测试过，但看起来您可以通过公开的 Mappings 属性正式扩展 mime 类型列表。
使用 MimeTypes NuGet 包
从 .NET Framework 的参考源复制 MimeMappings 文件
对于 .NET Framework >= 4.5：
使用 System.Web.MimeMapping.GetMimeMapping 方法，它是 .NET Framework 4.5 中 BCL 的一部分：
string mimeType = MimeMapping.GetMimeMapping(fileName);
如果您需要添加自定义映射，您可能可以使用反射将映射添加到 BCL MimeMapping 类，它使用公开此方法的自定义字典，因此您应该调用以下内容来添加映射（从未测试过，但应该可能。 工作）。
无论如何，当使用反射添加 MIME 类型时，请注意，由于您正在访问私有字段，其名称可能会更改甚至完全删除，因此您应该格外小心并添加双重检查并为每一步提供故障安全操作.
MimeMapping._mappingDictionary.AddMapping(string fileExtension, string mimeType)
更新
有关许多贡献者添加的最新映射，请参阅此 GitHub 存储库：
https://github.com/samuelneff/MimeTypeMap
和 NuGet 包
https://www.nuget.org/packages/MimeTypeMapOfficial/
我发现我的应用程序使用的许多 mime 类型不在默认的 Windows 注册表中，而其他类型在注册表中，但不在 IIS 包含的列表中。我已经从这些位置编译了一个列表，并添加了一些我们使用的其他位置。
编辑：查看具有贡献 here 的最新版本，包括有效且确定性的双向映射。
private static IDictionary<string, string> _mappings = new Dictionary<string, string>(StringComparer.InvariantCultureIgnoreCase) {
#region Big freaking list of mime types
// combination of values from Windows 7 Registry and
// from C:\Windows\System32\inetsrv\config\applicationHost.config
// some added, including .7z and .dat
{".323", "text/h323"},
{".3g2", "video/3gpp2"},
{".3gp", "video/3gpp"},
{".3gp2", "video/3gpp2"},
{".3gpp", "video/3gpp"},
{".7z", "application/x-7z-compressed"},
{".aa", "audio/audible"},
{".AAC", "audio/aac"},
{".aaf", "application/octet-stream"},
{".aax", "audio/vnd.audible.aax"},
{".ac3", "audio/ac3"},
{".aca", "application/octet-stream"},
{".accda", "application/msaccess.addin"},
{".accdb", "application/msaccess"},
{".accdc", "application/msaccess.cab"},
{".accde", "application/msaccess"},
{".accdr", "application/msaccess.runtime"},
{".accdt", "application/msaccess"},
{".accdw", "application/msaccess.webapplication"},
{".accft", "application/msaccess.ftemplate"},
{".acx", "application/internet-property-stream"},
{".AddIn", "text/xml"},
{".ade", "application/msaccess"},
{".adobebridge", "application/x-bridge-url"},
{".adp", "application/msaccess"},
{".ADT", "audio/vnd.dlna.adts"},
{".ADTS", "audio/aac"},
{".afm", "application/octet-stream"},
{".ai", "application/postscript"},
{".aif", "audio/x-aiff"},
{".aifc", "audio/aiff"},
{".aiff", "audio/aiff"},
{".air", "application/vnd.adobe.air-application-installer-package+zip"},
{".amc", "application/x-mpeg"},
{".application", "application/x-ms-application"},
{".art", "image/x-jg"},
{".asa", "application/xml"},
{".asax", "application/xml"},
{".ascx", "application/xml"},
{".asd", "application/octet-stream"},
{".asf", "video/x-ms-asf"},
{".ashx", "application/xml"},
{".asi", "application/octet-stream"},
{".asm", "text/plain"},
{".asmx", "application/xml"},
{".aspx", "application/xml"},
{".asr", "video/x-ms-asf"},
{".asx", "video/x-ms-asf"},
{".atom", "application/atom+xml"},
{".au", "audio/basic"},
{".avi", "video/x-msvideo"},
{".axs", "application/olescript"},
{".bas", "text/plain"},
{".bcpio", "application/x-bcpio"},
{".bin", "application/octet-stream"},
{".bmp", "image/bmp"},
{".c", "text/plain"},
{".cab", "application/octet-stream"},
{".caf", "audio/x-caf"},
{".calx", "application/vnd.ms-office.calx"},
{".cat", "application/vnd.ms-pki.seccat"},
{".cc", "text/plain"},
{".cd", "text/plain"},
{".cdda", "audio/aiff"},
{".cdf", "application/x-cdf"},
{".cer", "application/x-x509-ca-cert"},
{".chm", "application/octet-stream"},
{".class", "application/x-java-applet"},
{".clp", "application/x-msclip"},
{".cmx", "image/x-cmx"},
{".cnf", "text/plain"},
{".cod", "image/cis-cod"},
{".config", "application/xml"},
{".contact", "text/x-ms-contact"},
{".coverage", "application/xml"},
{".cpio", "application/x-cpio"},
{".cpp", "text/plain"},
{".crd", "application/x-mscardfile"},
{".crl", "application/pkix-crl"},
{".crt", "application/x-x509-ca-cert"},
{".cs", "text/plain"},
{".csdproj", "text/plain"},
{".csh", "application/x-csh"},
{".csproj", "text/plain"},
{".css", "text/css"},
{".csv", "text/csv"},
{".cur", "application/octet-stream"},
{".cxx", "text/plain"},
{".dat", "application/octet-stream"},
{".datasource", "application/xml"},
{".dbproj", "text/plain"},
{".dcr", "application/x-director"},
{".def", "text/plain"},
{".deploy", "application/octet-stream"},
{".der", "application/x-x509-ca-cert"},
{".dgml", "application/xml"},
{".dib", "image/bmp"},
{".dif", "video/x-dv"},
{".dir", "application/x-director"},
{".disco", "text/xml"},
{".dll", "application/x-msdownload"},
{".dll.config", "text/xml"},
{".dlm", "text/dlm"},
{".doc", "application/msword"},
{".docm", "application/vnd.ms-word.document.macroEnabled.12"},
{".docx", "application/vnd.openxmlformats-officedocument.wordprocessingml.document"},
{".dot", "application/msword"},
{".dotm", "application/vnd.ms-word.template.macroEnabled.12"},
{".dotx", "application/vnd.openxmlformats-officedocument.wordprocessingml.template"},
{".dsp", "application/octet-stream"},
{".dsw", "text/plain"},
{".dtd", "text/xml"},
{".dtsConfig", "text/xml"},
{".dv", "video/x-dv"},
{".dvi", "application/x-dvi"},
{".dwf", "drawing/x-dwf"},
{".dwp", "application/octet-stream"},
{".dxr", "application/x-director"},
{".eml", "message/rfc822"},
{".emz", "application/octet-stream"},
{".eot", "application/octet-stream"},
{".eps", "application/postscript"},
{".etl", "application/etl"},
{".etx", "text/x-setext"},
{".evy", "application/envoy"},
{".exe", "application/octet-stream"},
{".exe.config", "text/xml"},
{".fdf", "application/vnd.fdf"},
{".fif", "application/fractals"},
{".filters", "Application/xml"},
{".fla", "application/octet-stream"},
{".flr", "x-world/x-vrml"},
{".flv", "video/x-flv"},
{".fsscript", "application/fsharp-script"},
{".fsx", "application/fsharp-script"},
{".generictest", "application/xml"},
{".gif", "image/gif"},
{".group", "text/x-ms-group"},
{".gsm", "audio/x-gsm"},
{".gtar", "application/x-gtar"},
{".gz", "application/x-gzip"},
{".h", "text/plain"},
{".hdf", "application/x-hdf"},
{".hdml", "text/x-hdml"},
{".hhc", "application/x-oleobject"},
{".hhk", "application/octet-stream"},
{".hhp", "application/octet-stream"},
{".hlp", "application/winhlp"},
{".hpp", "text/plain"},
{".hqx", "application/mac-binhex40"},
{".hta", "application/hta"},
{".htc", "text/x-component"},
{".htm", "text/html"},
{".html", "text/html"},
{".htt", "text/webviewhtml"},
{".hxa", "application/xml"},
{".hxc", "application/xml"},
{".hxd", "application/octet-stream"},
{".hxe", "application/xml"},
{".hxf", "application/xml"},
{".hxh", "application/octet-stream"},
{".hxi", "application/octet-stream"},
{".hxk", "application/xml"},
{".hxq", "application/octet-stream"},
{".hxr", "application/octet-stream"},
{".hxs", "application/octet-stream"},
{".hxt", "text/html"},
{".hxv", "application/xml"},
{".hxw", "application/octet-stream"},
{".hxx", "text/plain"},
{".i", "text/plain"},
{".ico", "image/x-icon"},
{".ics", "application/octet-stream"},
{".idl", "text/plain"},
{".ief", "image/ief"},
{".iii", "application/x-iphone"},
{".inc", "text/plain"},
{".inf", "application/octet-stream"},
{".inl", "text/plain"},
{".ins", "application/x-internet-signup"},
{".ipa", "application/x-itunes-ipa"},
{".ipg", "application/x-itunes-ipg"},
{".ipproj", "text/plain"},
{".ipsw", "application/x-itunes-ipsw"},
{".iqy", "text/x-ms-iqy"},
{".isp", "application/x-internet-signup"},
{".ite", "application/x-itunes-ite"},
{".itlp", "application/x-itunes-itlp"},
{".itms", "application/x-itunes-itms"},
{".itpc", "application/x-itunes-itpc"},
{".IVF", "video/x-ivf"},
{".jar", "application/java-archive"},
{".java", "application/octet-stream"},
{".jck", "application/liquidmotion"},
{".jcz", "application/liquidmotion"},
{".jfif", "image/pjpeg"},
{".jnlp", "application/x-java-jnlp-file"},
{".jpb", "application/octet-stream"},
{".jpe", "image/jpeg"},
{".jpeg", "image/jpeg"},
{".jpg", "image/jpeg"},
{".js", "application/x-javascript"},
{".json", "application/json"},
{".jsx", "text/jscript"},
{".jsxbin", "text/plain"},
{".latex", "application/x-latex"},
{".library-ms", "application/windows-library+xml"},
{".lit", "application/x-ms-reader"},
{".loadtest", "application/xml"},
{".lpk", "application/octet-stream"},
{".lsf", "video/x-la-asf"},
{".lst", "text/plain"},
{".lsx", "video/x-la-asf"},
{".lzh", "application/octet-stream"},
{".m13", "application/x-msmediaview"},
{".m14", "application/x-msmediaview"},
{".m1v", "video/mpeg"},
{".m2t", "video/vnd.dlna.mpeg-tts"},
{".m2ts", "video/vnd.dlna.mpeg-tts"},
{".m2v", "video/mpeg"},
{".m3u", "audio/x-mpegurl"},
{".m3u8", "audio/x-mpegurl"},
{".m4a", "audio/m4a"},
{".m4b", "audio/m4b"},
{".m4p", "audio/m4p"},
{".m4r", "audio/x-m4r"},
{".m4v", "video/x-m4v"},
{".mac", "image/x-macpaint"},
{".mak", "text/plain"},
{".man", "application/x-troff-man"},
{".manifest", "application/x-ms-manifest"},
{".map", "text/plain"},
{".master", "application/xml"},
{".mda", "application/msaccess"},
{".mdb", "application/x-msaccess"},
{".mde", "application/msaccess"},
{".mdp", "application/octet-stream"},
{".me", "application/x-troff-me"},
{".mfp", "application/x-shockwave-flash"},
{".mht", "message/rfc822"},
{".mhtml", "message/rfc822"},
{".mid", "audio/mid"},
{".midi", "audio/mid"},
{".mix", "application/octet-stream"},
{".mk", "text/plain"},
{".mmf", "application/x-smaf"},
{".mno", "text/xml"},
{".mny", "application/x-msmoney"},
{".mod", "video/mpeg"},
{".mov", "video/quicktime"},
{".movie", "video/x-sgi-movie"},
{".mp2", "video/mpeg"},
{".mp2v", "video/mpeg"},
{".mp3", "audio/mpeg"},
{".mp4", "video/mp4"},
{".mp4v", "video/mp4"},
{".mpa", "video/mpeg"},
{".mpe", "video/mpeg"},
{".mpeg", "video/mpeg"},
{".mpf", "application/vnd.ms-mediapackage"},
{".mpg", "video/mpeg"},
{".mpp", "application/vnd.ms-project"},
{".mpv2", "video/mpeg"},
{".mqv", "video/quicktime"},
{".ms", "application/x-troff-ms"},
{".msi", "application/octet-stream"},
{".mso", "application/octet-stream"},
{".mts", "video/vnd.dlna.mpeg-tts"},
{".mtx", "application/xml"},
{".mvb", "application/x-msmediaview"},
{".mvc", "application/x-miva-compiled"},
{".mxp", "application/x-mmxp"},
{".nc", "application/x-netcdf"},
{".nsc", "video/x-ms-asf"},
{".nws", "message/rfc822"},
{".ocx", "application/octet-stream"},
{".oda", "application/oda"},
{".odc", "text/x-ms-odc"},
{".odh", "text/plain"},
{".odl", "text/plain"},
{".odp", "application/vnd.oasis.opendocument.presentation"},
{".ods", "application/oleobject"},
{".odt", "application/vnd.oasis.opendocument.text"},
{".one", "application/onenote"},
{".onea", "application/onenote"},
{".onepkg", "application/onenote"},
{".onetmp", "application/onenote"},
{".onetoc", "application/onenote"},
{".onetoc2", "application/onenote"},
{".orderedtest", "application/xml"},
{".osdx", "application/opensearchdescription+xml"},
{".p10", "application/pkcs10"},
{".p12", "application/x-pkcs12"},
{".p7b", "application/x-pkcs7-certificates"},
{".p7c", "application/pkcs7-mime"},
{".p7m", "application/pkcs7-mime"},
{".p7r", "application/x-pkcs7-certreqresp"},
{".p7s", "application/pkcs7-signature"},
{".pbm", "image/x-portable-bitmap"},
{".pcast", "application/x-podcast"},
{".pct", "image/pict"},
{".pcx", "application/octet-stream"},
{".pcz", "application/octet-stream"},
{".pdf", "application/pdf"},
{".pfb", "application/octet-stream"},
{".pfm", "application/octet-stream"},
{".pfx", "application/x-pkcs12"},
{".pgm", "image/x-portable-graymap"},
{".pic", "image/pict"},
{".pict", "image/pict"},
{".pkgdef", "text/plain"},
{".pkgundef", "text/plain"},
{".pko", "application/vnd.ms-pki.pko"},
{".pls", "audio/scpls"},
{".pma", "application/x-perfmon"},
{".pmc", "application/x-perfmon"},
{".pml", "application/x-perfmon"},
{".pmr", "application/x-perfmon"},
{".pmw", "application/x-perfmon"},
{".png", "image/png"},
{".pnm", "image/x-portable-anymap"},
{".pnt", "image/x-macpaint"},
{".pntg", "image/x-macpaint"},
{".pnz", "image/png"},
{".pot", "application/vnd.ms-powerpoint"},
{".potm", "application/vnd.ms-powerpoint.template.macroEnabled.12"},
{".potx", "application/vnd.openxmlformats-officedocument.presentationml.template"},
{".ppa", "application/vnd.ms-powerpoint"},
{".ppam", "application/vnd.ms-powerpoint.addin.macroEnabled.12"},
{".ppm", "image/x-portable-pixmap"},
{".pps", "application/vnd.ms-powerpoint"},
{".ppsm", "application/vnd.ms-powerpoint.slideshow.macroEnabled.12"},
{".ppsx", "application/vnd.openxmlformats-officedocument.presentationml.slideshow"},
{".ppt", "application/vnd.ms-powerpoint"},
{".pptm", "application/vnd.ms-powerpoint.presentation.macroEnabled.12"},
{".pptx", "application/vnd.openxmlformats-officedocument.presentationml.presentation"},
{".prf", "application/pics-rules"},
{".prm", "application/octet-stream"},
{".prx", "application/octet-stream"},
{".ps", "application/postscript"},
{".psc1", "application/PowerShell"},
{".psd", "application/octet-stream"},
{".psess", "application/xml"},
{".psm", "application/octet-stream"},
{".psp", "application/octet-stream"},
{".pub", "application/x-mspublisher"},
{".pwz", "application/vnd.ms-powerpoint"},
{".qht", "text/x-html-insertion"},
{".qhtm", "text/x-html-insertion"},
{".qt", "video/quicktime"},
{".qti", "image/x-quicktime"},
{".qtif", "image/x-quicktime"},
{".qtl", "application/x-quicktimeplayer"},
{".qxd", "application/octet-stream"},
{".ra", "audio/x-pn-realaudio"},
{".ram", "audio/x-pn-realaudio"},
{".rar", "application/octet-stream"},
{".ras", "image/x-cmu-raster"},
{".rat", "application/rat-file"},
{".rc", "text/plain"},
{".rc2", "text/plain"},
{".rct", "text/plain"},
{".rdlc", "application/xml"},
{".resx", "application/xml"},
{".rf", "image/vnd.rn-realflash"},
{".rgb", "image/x-rgb"},
{".rgs", "text/plain"},
{".rm", "application/vnd.rn-realmedia"},
{".rmi", "audio/mid"},
{".rmp", "application/vnd.rn-rn_music_package"},
{".roff", "application/x-troff"},
{".rpm", "audio/x-pn-realaudio-plugin"},
{".rqy", "text/x-ms-rqy"},
{".rtf", "application/rtf"},
{".rtx", "text/richtext"},
{".ruleset", "application/xml"},
{".s", "text/plain"},
{".safariextz", "application/x-safari-safariextz"},
{".scd", "application/x-msschedule"},
{".sct", "text/scriptlet"},
{".sd2", "audio/x-sd2"},
{".sdp", "application/sdp"},
{".sea", "application/octet-stream"},
{".searchConnector-ms", "application/windows-search-connector+xml"},
{".setpay", "application/set-payment-initiation"},
{".setreg", "application/set-registration-initiation"},
{".settings", "application/xml"},
{".sgimb", "application/x-sgimb"},
{".sgml", "text/sgml"},
{".sh", "application/x-sh"},
{".shar", "application/x-shar"},
{".shtml", "text/html"},
{".sit", "application/x-stuffit"},
{".sitemap", "application/xml"},
{".skin", "application/xml"},
{".sldm", "application/vnd.ms-powerpoint.slide.macroEnabled.12"},
{".sldx", "application/vnd.openxmlformats-officedocument.presentationml.slide"},
{".slk", "application/vnd.ms-excel"},
{".sln", "text/plain"},
{".slupkg-ms", "application/x-ms-license"},
{".smd", "audio/x-smd"},
{".smi", "application/octet-stream"},
{".smx", "audio/x-smd"},
{".smz", "audio/x-smd"},
{".snd", "audio/basic"},
{".snippet", "application/xml"},
{".snp", "application/octet-stream"},
{".sol", "text/plain"},
{".sor", "text/plain"},
{".spc", "application/x-pkcs7-certificates"},
{".spl", "application/futuresplash"},
{".src", "application/x-wais-source"},
{".srf", "text/plain"},
{".SSISDeploymentManifest", "text/xml"},
{".ssm", "application/streamingmedia"},
{".sst", "application/vnd.ms-pki.certstore"},
{".stl", "application/vnd.ms-pki.stl"},
{".sv4cpio", "application/x-sv4cpio"},
{".sv4crc", "application/x-sv4crc"},
{".svc", "application/xml"},
{".swf", "application/x-shockwave-flash"},
{".t", "application/x-troff"},
{".tar", "application/x-tar"},
{".tcl", "application/x-tcl"},
{".testrunconfig", "application/xml"},
{".testsettings", "application/xml"},
{".tex", "application/x-tex"},
{".texi", "application/x-texinfo"},
{".texinfo", "application/x-texinfo"},
{".tgz", "application/x-compressed"},
{".thmx", "application/vnd.ms-officetheme"},
{".thn", "application/octet-stream"},
{".tif", "image/tiff"},
{".tiff", "image/tiff"},
{".tlh", "text/plain"},
{".tli", "text/plain"},
{".toc", "application/octet-stream"},
{".tr", "application/x-troff"},
{".trm", "application/x-msterminal"},
{".trx", "application/xml"},
{".ts", "video/vnd.dlna.mpeg-tts"},
{".tsv", "text/tab-separated-values"},
{".ttf", "application/octet-stream"},
{".tts", "video/vnd.dlna.mpeg-tts"},
{".txt", "text/plain"},
{".u32", "application/octet-stream"},
{".uls", "text/iuls"},
{".user", "text/plain"},
{".ustar", "application/x-ustar"},
{".vb", "text/plain"},
{".vbdproj", "text/plain"},
{".vbk", "video/mpeg"},
{".vbproj", "text/plain"},
{".vbs", "text/vbscript"},
{".vcf", "text/x-vcard"},
{".vcproj", "Application/xml"},
{".vcs", "text/plain"},
{".vcxproj", "Application/xml"},
{".vddproj", "text/plain"},
{".vdp", "text/plain"},
{".vdproj", "text/plain"},
{".vdx", "application/vnd.ms-visio.viewer"},
{".vml", "text/xml"},
{".vscontent", "application/xml"},
{".vsct", "text/xml"},
{".vsd", "application/vnd.visio"},
{".vsi", "application/ms-vsi"},
{".vsix", "application/vsix"},
{".vsixlangpack", "text/xml"},
{".vsixmanifest", "text/xml"},
{".vsmdi", "application/xml"},
{".vspscc", "text/plain"},
{".vss", "application/vnd.visio"},
{".vsscc", "text/plain"},
{".vssettings", "text/xml"},
{".vssscc", "text/plain"},
{".vst", "application/vnd.visio"},
{".vstemplate", "text/xml"},
{".vsto", "application/x-ms-vsto"},
{".vsw", "application/vnd.visio"},
{".vsx", "application/vnd.visio"},
{".vtx", "application/vnd.visio"},
{".wav", "audio/wav"},
{".wave", "audio/wav"},
{".wax", "audio/x-ms-wax"},
{".wbk", "application/msword"},
{".wbmp", "image/vnd.wap.wbmp"},
{".wcm", "application/vnd.ms-works"},
{".wdb", "application/vnd.ms-works"},
{".wdp", "image/vnd.ms-photo"},
{".webarchive", "application/x-safari-webarchive"},
{".webtest", "application/xml"},
{".wiq", "application/xml"},
{".wiz", "application/msword"},
{".wks", "application/vnd.ms-works"},
{".WLMP", "application/wlmoviemaker"},
{".wlpginstall", "application/x-wlpg-detect"},
{".wlpginstall3", "application/x-wlpg3-detect"},
{".wm", "video/x-ms-wm"},
{".wma", "audio/x-ms-wma"},
{".wmd", "application/x-ms-wmd"},
{".wmf", "application/x-msmetafile"},
{".wml", "text/vnd.wap.wml"},
{".wmlc", "application/vnd.wap.wmlc"},
{".wmls", "text/vnd.wap.wmlscript"},
{".wmlsc", "application/vnd.wap.wmlscriptc"},
{".wmp", "video/x-ms-wmp"},
{".wmv", "video/x-ms-wmv"},
{".wmx", "video/x-ms-wmx"},
{".wmz", "application/x-ms-wmz"},
{".wpl", "application/vnd.ms-wpl"},
{".wps", "application/vnd.ms-works"},
{".wri", "application/x-mswrite"},
{".wrl", "x-world/x-vrml"},
{".wrz", "x-world/x-vrml"},
{".wsc", "text/scriptlet"},
{".wsdl", "text/xml"},
{".wvx", "video/x-ms-wvx"},
{".x", "application/directx"},
{".xaf", "x-world/x-vrml"},
{".xaml", "application/xaml+xml"},
{".xap", "application/x-silverlight-app"},
{".xbap", "application/x-ms-xbap"},
{".xbm", "image/x-xbitmap"},
{".xdr", "text/plain"},
{".xht", "application/xhtml+xml"},
{".xhtml", "application/xhtml+xml"},
{".xla", "application/vnd.ms-excel"},
{".xlam", "application/vnd.ms-excel.addin.macroEnabled.12"},
{".xlc", "application/vnd.ms-excel"},
{".xld", "application/vnd.ms-excel"},
{".xlk", "application/vnd.ms-excel"},
{".xll", "application/vnd.ms-excel"},
{".xlm", "application/vnd.ms-excel"},
{".xls", "application/vnd.ms-excel"},
{".xlsb", "application/vnd.ms-excel.sheet.binary.macroEnabled.12"},
{".xlsm", "application/vnd.ms-excel.sheet.macroEnabled.12"},
{".xlsx", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"},
{".xlt", "application/vnd.ms-excel"},
{".xltm", "application/vnd.ms-excel.template.macroEnabled.12"},
{".xltx", "application/vnd.openxmlformats-officedocument.spreadsheetml.template"},
{".xlw", "application/vnd.ms-excel"},
{".xml", "text/xml"},
{".xmta", "application/xml"},
{".xof", "x-world/x-vrml"},
{".XOML", "text/plain"},
{".xpm", "image/x-xpixmap"},
{".xps", "application/vnd.ms-xpsdocument"},
{".xrm-ms", "text/xml"},
{".xsc", "application/xml"},
{".xsd", "text/xml"},
{".xsf", "text/xml"},
{".xsl", "text/xml"},
{".xslt", "text/xml"},
{".xsn", "application/octet-stream"},
{".xss", "application/xml"},
{".xtp", "application/octet-stream"},
{".xwd", "image/x-xwindowdump"},
{".z", "application/x-compress"},
{".zip", "application/x-zip-compressed"},
#endregion
};
public static string GetMimeType(string extension)
{
if (extension == null)
{
throw new ArgumentNullException("extension");
}
if (!extension.StartsWith("."))
{
extension = "." + extension;
}
string mime;
return _mappings.TryGetValue(extension, out mime) ? mime : "application/octet-stream";
}
.docx 和 .xlsx 以及其他重要的网络扩展，例如 .csv、.swf 和 .air。
您可以使用此辅助功能：
private string GetMimeType (string fileName)
{
string mimeType = "application/unknown";
string ext = System.IO.Path.GetExtension(fileName).ToLower();
Microsoft.Win32.RegistryKey regKey = Microsoft.Win32.Registry.ClassesRoot.OpenSubKey(ext);
if (regKey != null && regKey.GetValue("Content Type") != null)
mimeType = regKey.GetValue("Content Type").ToString();
return mimeType;
}
var mimeType = MimeMapping.GetMimeMapping(fileName);
System.Web.dll v4.5
// Summary:
// Returns the MIME mapping for the specified file name.
//
// Parameters:
// fileName:
// The file name that is used to determine the MIME type.
public static string GetMimeMapping(string fileName);
我喜欢 Samuel Neff 所做的工作，但不喜欢每次都创建字典的想法和开销。
我将事物重组为开关盒。是的，你不能迭代它，但在我的例子中，我只用它来快速查找一个值。特别是因为它是在 Web 服务中完成的，所以我最不想要的就是应用程序准备其结构时的大量开销。编译器会将其转换为散列查找，因此速度非常快。
public static string GetMimeType(string extension)
{
if (extension == null)
throw new ArgumentNullException("extension");
if (extension.StartsWith("."))
extension = extension.Substring(1);
switch (extension.ToLower())
{
#region Big freaking list of mime types
case "323": return "text/h323";
case "3g2": return "video/3gpp2";
case "3gp": return "video/3gpp";
case "3gp2": return "video/3gpp2";
case "3gpp": return "video/3gpp";
case "7z": return "application/x-7z-compressed";
case "aa": return "audio/audible";
case "aac": return "audio/aac";
case "aaf": return "application/octet-stream";
case "aax": return "audio/vnd.audible.aax";
case "ac3": return "audio/ac3";
case "aca": return "application/octet-stream";
case "accda": return "application/msaccess.addin";
case "accdb": return "application/msaccess";
case "accdc": return "application/msaccess.cab";
case "accde": return "application/msaccess";
case "accdr": return "application/msaccess.runtime";
case "accdt": return "application/msaccess";
case "accdw": return "application/msaccess.webapplication";
case "accft": return "application/msaccess.ftemplate";
case "acx": return "application/internet-property-stream";
case "addin": return "text/xml";
case "ade": return "application/msaccess";
case "adobebridge": return "application/x-bridge-url";
case "adp": return "application/msaccess";
case "adt": return "audio/vnd.dlna.adts";
case "adts": return "audio/aac";
case "afm": return "application/octet-stream";
case "ai": return "application/postscript";
case "aif": return "audio/x-aiff";
case "aifc": return "audio/aiff";
case "aiff": return "audio/aiff";
case "air": return "application/vnd.adobe.air-application-installer-package+zip";
case "amc": return "application/x-mpeg";
case "application": return "application/x-ms-application";
case "art": return "image/x-jg";
case "asa": return "application/xml";
case "asax": return "application/xml";
case "ascx": return "application/xml";
case "asd": return "application/octet-stream";
case "asf": return "video/x-ms-asf";
case "ashx": return "application/xml";
case "asi": return "application/octet-stream";
case "asm": return "text/plain";
case "asmx": return "application/xml";
case "aspx": return "application/xml";
case "asr": return "video/x-ms-asf";
case "asx": return "video/x-ms-asf";
case "atom": return "application/atom+xml";
case "au": return "audio/basic";
case "avi": return "video/x-msvideo";
case "axs": return "application/olescript";
case "bas": return "text/plain";
case "bcpio": return "application/x-bcpio";
case "bin": return "application/octet-stream";
case "bmp": return "image/bmp";
case "c": return "text/plain";
case "cab": return "application/octet-stream";
case "caf": return "audio/x-caf";
case "calx": return "application/vnd.ms-office.calx";
case "cat": return "application/vnd.ms-pki.seccat";
case "cc": return "text/plain";
case "cd": return "text/plain";
case "cdda": return "audio/aiff";
case "cdf": return "application/x-cdf";
case "cer": return "application/x-x509-ca-cert";
case "chm": return "application/octet-stream";
case "class": return "application/x-java-applet";
case "clp": return "application/x-msclip";
case "cmx": return "image/x-cmx";
case "cnf": return "text/plain";
case "cod": return "image/cis-cod";
case "config": return "application/xml";
case "contact": return "text/x-ms-contact";
case "coverage": return "application/xml";
case "cpio": return "application/x-cpio";
case "cpp": return "text/plain";
case "crd": return "application/x-mscardfile";
case "crl": return "application/pkix-crl";
case "crt": return "application/x-x509-ca-cert";
case "cs": return "text/plain";
case "csdproj": return "text/plain";
case "csh": return "application/x-csh";
case "csproj": return "text/plain";
case "css": return "text/css";
case "csv": return "text/csv";
case "cur": return "application/octet-stream";
case "cxx": return "text/plain";
case "dat": return "application/octet-stream";
case "datasource": return "application/xml";
case "dbproj": return "text/plain";
case "dcr": return "application/x-director";
case "def": return "text/plain";
case "deploy": return "application/octet-stream";
case "der": return "application/x-x509-ca-cert";
case "dgml": return "application/xml";
case "dib": return "image/bmp";
case "dif": return "video/x-dv";
case "dir": return "application/x-director";
case "disco": return "text/xml";
case "dll": return "application/x-msdownload";
case "dll.config": return "text/xml";
case "dlm": return "text/dlm";
case "doc": return "application/msword";
case "docm": return "application/vnd.ms-word.document.macroenabled.12";
case "docx": return "application/vnd.openxmlformats-officedocument.wordprocessingml.document";
case "dot": return "application/msword";
case "dotm": return "application/vnd.ms-word.template.macroenabled.12";
case "dotx": return "application/vnd.openxmlformats-officedocument.wordprocessingml.template";
case "dsp": return "application/octet-stream";
case "dsw": return "text/plain";
case "dtd": return "text/xml";
case "dtsconfig": return "text/xml";
case "dv": return "video/x-dv";
case "dvi": return "application/x-dvi";
case "dwf": return "drawing/x-dwf";
case "dwp": return "application/octet-stream";
case "dxr": return "application/x-director";
case "eml": return "message/rfc822";
case "emz": return "application/octet-stream";
case "eot": return "application/octet-stream";
case "eps": return "application/postscript";
case "etl": return "application/etl";
case "etx": return "text/x-setext";
case "evy": return "application/envoy";
case "exe": return "application/octet-stream";
case "exe.config": return "text/xml";
case "fdf": return "application/vnd.fdf";
case "fif": return "application/fractals";
case "filters": return "application/xml";
case "fla": return "application/octet-stream";
case "flr": return "x-world/x-vrml";
case "flv": return "video/x-flv";
case "fsscript": return "application/fsharp-script";
case "fsx": return "application/fsharp-script";
case "generictest": return "application/xml";
case "gif": return "image/gif";
case "group": return "text/x-ms-group";
case "gsm": return "audio/x-gsm";
case "gtar": return "application/x-gtar";
case "gz": return "application/x-gzip";
case "h": return "text/plain";
case "hdf": return "application/x-hdf";
case "hdml": return "text/x-hdml";
case "hhc": return "application/x-oleobject";
case "hhk": return "application/octet-stream";
case "hhp": return "application/octet-stream";
case "hlp": return "application/winhlp";
case "hpp": return "text/plain";
case "hqx": return "application/mac-binhex40";
case "hta": return "application/hta";
case "htc": return "text/x-component";
case "htm": return "text/html";
case "html": return "text/html";
case "htt": return "text/webviewhtml";
case "hxa": return "application/xml";
case "hxc": return "application/xml";
case "hxd": return "application/octet-stream";
case "hxe": return "application/xml";
case "hxf": return "application/xml";
case "hxh": return "application/octet-stream";
case "hxi": return "application/octet-stream";
case "hxk": return "application/xml";
case "hxq": return "application/octet-stream";
case "hxr": return "application/octet-stream";
case "hxs": return "application/octet-stream";
case "hxt": return "text/html";
case "hxv": return "application/xml";
case "hxw": return "application/octet-stream";
case "hxx": return "text/plain";
case "i": return "text/plain";
case "ico": return "image/x-icon";
case "ics": return "application/octet-stream";
case "idl": return "text/plain";
case "ief": return "image/ief";
case "iii": return "application/x-iphone";
case "inc": return "text/plain";
case "inf": return "application/octet-stream";
case "inl": return "text/plain";
case "ins": return "application/x-internet-signup";
case "ipa": return "application/x-itunes-ipa";
case "ipg": return "application/x-itunes-ipg";
case "ipproj": return "text/plain";
case "ipsw": return "application/x-itunes-ipsw";
case "iqy": return "text/x-ms-iqy";
case "isp": return "application/x-internet-signup";
case "ite": return "application/x-itunes-ite";
case "itlp": return "application/x-itunes-itlp";
case "itms": return "application/x-itunes-itms";
case "itpc": return "application/x-itunes-itpc";
case "ivf": return "video/x-ivf";
case "jar": return "application/java-archive";
case "java": return "application/octet-stream";
case "jck": return "application/liquidmotion";
case "jcz": return "application/liquidmotion";
case "jfif": return "image/pjpeg";
case "jnlp": return "application/x-java-jnlp-file";
case "jpb": return "application/octet-stream";
case "jpe": return "image/jpeg";
case "jpeg": return "image/jpeg";
case "jpg": return "image/jpeg";
case "js": return "application/x-javascript";
case "jsx": return "text/jscript";
case "jsxbin": return "text/plain";
case "latex": return "application/x-latex";
case "library-ms": return "application/windows-library+xml";
case "lit": return "application/x-ms-reader";
case "loadtest": return "application/xml";
case "lpk": return "application/octet-stream";
case "lsf": return "video/x-la-asf";
case "lst": return "text/plain";
case "lsx": return "video/x-la-asf";
case "lzh": return "application/octet-stream";
case "m13": return "application/x-msmediaview";
case "m14": return "application/x-msmediaview";
case "m1v": return "video/mpeg";
case "m2t": return "video/vnd.dlna.mpeg-tts";
case "m2ts": return "video/vnd.dlna.mpeg-tts";
case "m2v": return "video/mpeg";
case "m3u": return "audio/x-mpegurl";
case "m3u8": return "audio/x-mpegurl";
case "m4a": return "audio/m4a";
case "m4b": return "audio/m4b";
case "m4p": return "audio/m4p";
case "m4r": return "audio/x-m4r";
case "m4v": return "video/x-m4v";
case "mac": return "image/x-macpaint";
case "mak": return "text/plain";
case "man": return "application/x-troff-man";
case "manifest": return "application/x-ms-manifest";
case "map": return "text/plain";
case "master": return "application/xml";
case "mda": return "application/msaccess";
case "mdb": return "application/x-msaccess";
case "mde": return "application/msaccess";
case "mdp": return "application/octet-stream";
case "me": return "application/x-troff-me";
case "mfp": return "application/x-shockwave-flash";
case "mht": return "message/rfc822";
case "mhtml": return "message/rfc822";
case "mid": return "audio/mid";
case "midi": return "audio/mid";
case "mix": return "application/octet-stream";
case "mk": return "text/plain";
case "mmf": return "application/x-smaf";
case "mno": return "text/xml";
case "mny": return "application/x-msmoney";
case "mod": return "video/mpeg";
case "mov": return "video/quicktime";
case "movie": return "video/x-sgi-movie";
case "mp2": return "video/mpeg";
case "mp2v": return "video/mpeg";
case "mp3": return "audio/mpeg";
case "mp4": return "video/mp4";
case "mp4v": return "video/mp4";
case "mpa": return "video/mpeg";
case "mpe": return "video/mpeg";
case "mpeg": return "video/mpeg";
case "mpf": return "application/vnd.ms-mediapackage";
case "mpg": return "video/mpeg";
case "mpp": return "application/vnd.ms-project";
case "mpv2": return "video/mpeg";
case "mqv": return "video/quicktime";
case "ms": return "application/x-troff-ms";
case "msi": return "application/octet-stream";
case "mso": return "application/octet-stream";
case "mts": return "video/vnd.dlna.mpeg-tts";
case "mtx": return "application/xml";
case "mvb": return "application/x-msmediaview";
case "mvc": return "application/x-miva-compiled";
case "mxp": return "application/x-mmxp";
case "nc": return "application/x-netcdf";
case "nsc": return "video/x-ms-asf";
case "nws": return "message/rfc822";
case "ocx": return "application/octet-stream";
case "oda": return "application/oda";
case "odc": return "text/x-ms-odc";
case "odh": return "text/plain";
case "odl": return "text/plain";
case "odp": return "application/vnd.oasis.opendocument.presentation";
case "ods": return "application/oleobject";
case "odt": return "application/vnd.oasis.opendocument.text";
case "one": return "application/onenote";
case "onea": return "application/onenote";
case "onepkg": return "application/onenote";
case "onetmp": return "application/onenote";
case "onetoc": return "application/onenote";
case "onetoc2": return "application/onenote";
case "orderedtest": return "application/xml";
case "osdx": return "application/opensearchdescription+xml";
case "p10": return "application/pkcs10";
case "p12": return "application/x-pkcs12";
case "p7b": return "application/x-pkcs7-certificates";
case "p7c": return "application/pkcs7-mime";
case "p7m": return "application/pkcs7-mime";
case "p7r": return "application/x-pkcs7-certreqresp";
case "p7s": return "application/pkcs7-signature";
case "pbm": return "image/x-portable-bitmap";
case "pcast": return "application/x-podcast";
case "pct": return "image/pict";
case "pcx": return "application/octet-stream";
case "pcz": return "application/octet-stream";
case "pdf": return "application/pdf";
case "pfb": return "application/octet-stream";
case "pfm": return "application/octet-stream";
case "pfx": return "application/x-pkcs12";
case "pgm": return "image/x-portable-graymap";
case "pic": return "image/pict";
case "pict": return "image/pict";
case "pkgdef": return "text/plain";
case "pkgundef": return "text/plain";
case "pko": return "application/vnd.ms-pki.pko";
case "pls": return "audio/scpls";
case "pma": return "application/x-perfmon";
case "pmc": return "application/x-perfmon";
case "pml": return "application/x-perfmon";
case "pmr": return "application/x-perfmon";
case "pmw": return "application/x-perfmon";
case "png": return "image/png";
case "pnm": return "image/x-portable-anymap";
case "pnt": return "image/x-macpaint";
case "pntg": return "image/x-macpaint";
case "pnz": return "image/png";
case "pot": return "application/vnd.ms-powerpoint";
case "potm": return "application/vnd.ms-powerpoint.template.macroenabled.12";
case "potx": return "application/vnd.openxmlformats-officedocument.presentationml.template";
case "ppa": return "application/vnd.ms-powerpoint";
case "ppam": return "application/vnd.ms-powerpoint.addin.macroenabled.12";
case "ppm": return "image/x-portable-pixmap";
case "pps": return "application/vnd.ms-powerpoint";
case "ppsm": return "application/vnd.ms-powerpoint.slideshow.macroenabled.12";
case "ppsx": return "application/vnd.openxmlformats-officedocument.presentationml.slideshow";
case "ppt": return "application/vnd.ms-powerpoint";
case "pptm": return "application/vnd.ms-powerpoint.presentation.macroenabled.12";
case "pptx": return "application/vnd.openxmlformats-officedocument.presentationml.presentation";
case "prf": return "application/pics-rules";
case "prm": return "application/octet-stream";
case "prx": return "application/octet-stream";
case "ps": return "application/postscript";
case "psc1": return "application/powershell";
case "psd": return "application/octet-stream";
case "psess": return "application/xml";
case "psm": return "application/octet-stream";
case "psp": return "application/octet-stream";
case "pub": return "application/x-mspublisher";
case "pwz": return "application/vnd.ms-powerpoint";
case "qht": return "text/x-html-insertion";
case "qhtm": return "text/x-html-insertion";
case "qt": return "video/quicktime";
case "qti": return "image/x-quicktime";
case "qtif": return "image/x-quicktime";
case "qtl": return "application/x-quicktimeplayer";
case "qxd": return "application/octet-stream";
case "ra": return "audio/x-pn-realaudio";
case "ram": return "audio/x-pn-realaudio";
case "rar": return "application/octet-stream";
case "ras": return "image/x-cmu-raster";
case "rat": return "application/rat-file";
case "rc": return "text/plain";
case "rc2": return "text/plain";
case "rct": return "text/plain";
case "rdlc": return "application/xml";
case "resx": return "application/xml";
case "rf": return "image/vnd.rn-realflash";
case "rgb": return "image/x-rgb";
case "rgs": return "text/plain";
case "rm": return "application/vnd.rn-realmedia";
case "rmi": return "audio/mid";
case "rmp": return "application/vnd.rn-rn_music_package";
case "roff": return "application/x-troff";
case "rpm": return "audio/x-pn-realaudio-plugin";
case "rqy": return "text/x-ms-rqy";
case "rtf": return "application/rtf";
case "rtx": return "text/richtext";
case "ruleset": return "application/xml";
case "s": return "text/plain";
case "safariextz": return "application/x-safari-safariextz";
case "scd": return "application/x-msschedule";
case "sct": return "text/scriptlet";
case "sd2": return "audio/x-sd2";
case "sdp": return "application/sdp";
case "sea": return "application/octet-stream";
case "searchconnector-ms": return "application/windows-search-connector+xml";
case "setpay": return "application/set-payment-initiation";
case "setreg": return "application/set-registration-initiation";
case "settings": return "application/xml";
case "sgimb": return "application/x-sgimb";
case "sgml": return "text/sgml";
case "sh": return "application/x-sh";
case "shar": return "application/x-shar";
case "shtml": return "text/html";
case "sit": return "application/x-stuffit";
case "sitemap": return "application/xml";
case "skin": return "application/xml";
case "sldm": return "application/vnd.ms-powerpoint.slide.macroenabled.12";
case "sldx": return "application/vnd.openxmlformats-officedocument.presentationml.slide";
case "slk": return "application/vnd.ms-excel";
case "sln": return "text/plain";
case "slupkg-ms": return "application/x-ms-license";
case "smd": return "audio/x-smd";
case "smi": return "application/octet-stream";
case "smx": return "audio/x-smd";
case "smz": return "audio/x-smd";
case "snd": return "audio/basic";
case "snippet": return "application/xml";
case "snp": return "application/octet-stream";
case "sol": return "text/plain";
case "sor": return "text/plain";
case "spc": return "application/x-pkcs7-certificates";
case "spl": return "application/futuresplash";
case "src": return "application/x-wais-source";
case "srf": return "text/plain";
case "ssisdeploymentmanifest": return "text/xml";
case "ssm": return "application/streamingmedia";
case "sst": return "application/vnd.ms-pki.certstore";
case "stl": return "application/vnd.ms-pki.stl";
case "sv4cpio": return "application/x-sv4cpio";
case "sv4crc": return "application/x-sv4crc";
case "svc": return "application/xml";
case "swf": return "application/x-shockwave-flash";
case "t": return "application/x-troff";
case "tar": return "application/x-tar";
case "tcl": return "application/x-tcl";
case "testrunconfig": return "application/xml";
case "testsettings": return "application/xml";
case "tex": return "application/x-tex";
case "texi": return "application/x-texinfo";
case "texinfo": return "application/x-texinfo";
case "tgz": return "application/x-compressed";
case "thmx": return "application/vnd.ms-officetheme";
case "thn": return "application/octet-stream";
case "tif": return "image/tiff";
case "tiff": return "image/tiff";
case "tlh": return "text/plain";
case "tli": return "text/plain";
case "toc": return "application/octet-stream";
case "tr": return "application/x-troff";
case "trm": return "application/x-msterminal";
case "trx": return "application/xml";
case "ts": return "video/vnd.dlna.mpeg-tts";
case "tsv": return "text/tab-separated-values";
case "ttf": return "application/octet-stream";
case "tts": return "video/vnd.dlna.mpeg-tts";
case "txt": return "text/plain";
case "u32": return "application/octet-stream";
case "uls": return "text/iuls";
case "user": return "text/plain";
case "ustar": return "application/x-ustar";
case "vb": return "text/plain";
case "vbdproj": return "text/plain";
case "vbk": return "video/mpeg";
case "vbproj": return "text/plain";
case "vbs": return "text/vbscript";
case "vcf": return "text/x-vcard";
case "vcproj": return "application/xml";
case "vcs": return "text/plain";
case "vcxproj": return "application/xml";
case "vddproj": return "text/plain";
case "vdp": return "text/plain";
case "vdproj": return "text/plain";
case "vdx": return "application/vnd.ms-visio.viewer";
case "vml": return "text/xml";
case "vscontent": return "application/xml";
case "vsct": return "text/xml";
case "vsd": return "application/vnd.visio";
case "vsi": return "application/ms-vsi";
case "vsix": return "application/vsix";
case "vsixlangpack": return "text/xml";
case "vsixmanifest": return "text/xml";
case "vsmdi": return "application/xml";
case "vspscc": return "text/plain";
case "vss": return "application/vnd.visio";
case "vsscc": return "text/plain";
case "vssettings": return "text/xml";
case "vssscc": return "text/plain";
case "vst": return "application/vnd.visio";
case "vstemplate": return "text/xml";
case "vsto": return "application/x-ms-vsto";
case "vsw": return "application/vnd.visio";
case "vsx": return "application/vnd.visio";
case "vtx": return "application/vnd.visio";
case "wav": return "audio/wav";
case "wave": return "audio/wav";
case "wax": return "audio/x-ms-wax";
case "wbk": return "application/msword";
case "wbmp": return "image/vnd.wap.wbmp";
case "wcm": return "application/vnd.ms-works";
case "wdb": return "application/vnd.ms-works";
case "wdp": return "image/vnd.ms-photo";
case "webarchive": return "application/x-safari-webarchive";
case "webtest": return "application/xml";
case "wiq": return "application/xml";
case "wiz": return "application/msword";
case "wks": return "application/vnd.ms-works";
case "wlmp": return "application/wlmoviemaker";
case "wlpginstall": return "application/x-wlpg-detect";
case "wlpginstall3": return "application/x-wlpg3-detect";
case "wm": return "video/x-ms-wm";
case "wma": return "audio/x-ms-wma";
case "wmd": return "application/x-ms-wmd";
case "wmf": return "application/x-msmetafile";
case "wml": return "text/vnd.wap.wml";
case "wmlc": return "application/vnd.wap.wmlc";
case "wmls": return "text/vnd.wap.wmlscript";
case "wmlsc": return "application/vnd.wap.wmlscriptc";
case "wmp": return "video/x-ms-wmp";
case "wmv": return "video/x-ms-wmv";
case "wmx": return "video/x-ms-wmx";
case "wmz": return "application/x-ms-wmz";
case "wpl": return "application/vnd.ms-wpl";
case "wps": return "application/vnd.ms-works";
case "wri": return "application/x-mswrite";
case "wrl": return "x-world/x-vrml";
case "wrz": return "x-world/x-vrml";
case "wsc": return "text/scriptlet";
case "wsdl": return "text/xml";
case "wvx": return "video/x-ms-wvx";
case "x": return "application/directx";
case "xaf": return "x-world/x-vrml";
case "xaml": return "application/xaml+xml";
case "xap": return "application/x-silverlight-app";
case "xbap": return "application/x-ms-xbap";
case "xbm": return "image/x-xbitmap";
case "xdr": return "text/plain";
case "xht": return "application/xhtml+xml";
case "xhtml": return "application/xhtml+xml";
case "xla": return "application/vnd.ms-excel";
case "xlam": return "application/vnd.ms-excel.addin.macroenabled.12";
case "xlc": return "application/vnd.ms-excel";
case "xld": return "application/vnd.ms-excel";
case "xlk": return "application/vnd.ms-excel";
case "xll": return "application/vnd.ms-excel";
case "xlm": return "application/vnd.ms-excel";
case "xls": return "application/vnd.ms-excel";
case "xlsb": return "application/vnd.ms-excel.sheet.binary.macroenabled.12";
case "xlsm": return "application/vnd.ms-excel.sheet.macroenabled.12";
case "xlsx": return "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
case "xlt": return "application/vnd.ms-excel";
case "xltm": return "application/vnd.ms-excel.template.macroenabled.12";
case "xltx": return "application/vnd.openxmlformats-officedocument.spreadsheetml.template";
case "xlw": return "application/vnd.ms-excel";
case "xml": return "text/xml";
case "xmta": return "application/xml";
case "xof": return "x-world/x-vrml";
case "xoml": return "text/plain";
case "xpm": return "image/x-xpixmap";
case "xps": return "application/vnd.ms-xpsdocument";
case "xrm-ms": return "text/xml";
case "xsc": return "application/xml";
case "xsd": return "text/xml";
case "xsf": return "text/xml";
case "xsl": return "text/xml";
case "xslt": return "text/xml";
case "xsn": return "application/octet-stream";
case "xss": return "application/xml";
case "xtp": return "application/octet-stream";
case "xwd": return "image/x-xwindowdump";
case "z": return "application/x-compress";
case "zip": return "application/x-zip-compressed";
#endregion
default: return "application/octet-stream";
}
}
if/else、while、for...这些都不存在。但是，switch/case 应用于通常在枚举中找到的小整数值，确实存在。这是一个非常优雅的小手术。它也根本不适用于字符串，这意味着你写的实际上只是一堆字符串比较。 Dictionary 对象在任何一天都能胜过。
我编写了一个程序来获取 Apache mime.types file 并将其转换为由文件扩展名键入的 C# Dictionary<string, string>。这是here。
实际输出是 this file （但您可能想要获取它并再次运行它，以防 Apache 文件自我上次运行以来已更新）。
public static Dictionary<string, string> MimeTypes = new Dictionary<string, string>
{
{ "123", "application/vnd.lotus-1-2-3" },
{ "3dml", "text/vnd.in3d.3dml" },
{ "3g2", "video/3gpp2" },
{ "3gp", "video/3gpp" },
{ "7z", "application/x-7z-compressed" },
{ "aab", "application/x-authorware-bin" },
{ "aac", "audio/x-aac" },
{ "aam", "application/x-authorware-map" },
{ "aas", "application/x-authorware-seg" },
{ "abw", "application/x-abiword" },
...
Dictionary<String,String[]> 及其所有扩展。它对于根据提交的内容类型检查下载并在需要时添加默认扩展很有用。
您可以在注册表中找到该信息。例如，.pdf 文件的 MIME 类型可以在键 HKEY_CLASSES_ROOT\.pdf 中的值 "Content Type" 中找到：
string mimeType = Registry.GetValue(@"HKEY_CLASSES_ROOT\.pdf", "Content Type", null) as string;
我知道问题是针对 C# 我只想保留 Javascript 格式，因为我刚刚转换了 Samuel 的答案：
export const contentTypes = {
".323": "text/h323",
".3g2": "video/3gpp2",
".3gp": "video/3gpp",
".3gp2": "video/3gpp2",
".3gpp": "video/3gpp",
".7z": "application/x-7z-compressed",
".aa": "audio/audible",
".AAC": "audio/aac",
".aaf": "application/octet-stream",
".aax": "audio/vnd.audible.aax",
".ac3": "audio/ac3",
".aca": "application/octet-stream",
".accda": "application/msaccess.addin",
".accdb": "application/msaccess",
".accdc": "application/msaccess.cab",
".accde": "application/msaccess",
".accdr": "application/msaccess.runtime",
".accdt": "application/msaccess",
".accdw": "application/msaccess.webapplication",
".accft": "application/msaccess.ftemplate",
".acx": "application/internet-property-stream",
".AddIn": "text/xml",
".ade": "application/msaccess",
".adobebridge": "application/x-bridge-url",
".adp": "application/msaccess",
".ADT": "audio/vnd.dlna.adts",
".ADTS": "audio/aac",
".afm": "application/octet-stream",
".ai": "application/postscript",
".aif": "audio/x-aiff",
".aifc": "audio/aiff",
".aiff": "audio/aiff",
".air": "application/vnd.adobe.air-application-installer-package+zip",
".amc": "application/x-mpeg",
".application": "application/x-ms-application",
".art": "image/x-jg",
".asa": "application/xml",
".asax": "application/xml",
".ascx": "application/xml",
".asd": "application/octet-stream",
".asf": "video/x-ms-asf",
".ashx": "application/xml",
".asi": "application/octet-stream",
".asm": "text/plain",
".asmx": "application/xml",
".aspx": "application/xml",
".asr": "video/x-ms-asf",
".asx": "video/x-ms-asf",
".atom": "application/atom+xml",
".au": "audio/basic",
".avi": "video/x-msvideo",
".axs": "application/olescript",
".bas": "text/plain",
".bcpio": "application/x-bcpio",
".bin": "application/octet-stream",
".bmp": "image/bmp",
".c": "text/plain",
".cab": "application/octet-stream",
".caf": "audio/x-caf",
".calx": "application/vnd.ms-office.calx",
".cat": "application/vnd.ms-pki.seccat",
".cc": "text/plain",
".cd": "text/plain",
".cdda": "audio/aiff",
".cdf": "application/x-cdf",
".cer": "application/x-x509-ca-cert",
".chm": "application/octet-stream",
".class": "application/x-java-applet",
".clp": "application/x-msclip",
".cmx": "image/x-cmx",
".cnf": "text/plain",
".cod": "image/cis-cod",
".config": "application/xml",
".contact": "text/x-ms-contact",
".coverage": "application/xml",
".cpio": "application/x-cpio",
".cpp": "text/plain",
".crd": "application/x-mscardfile",
".crl": "application/pkix-crl",
".crt": "application/x-x509-ca-cert",
".cs": "text/plain",
".csdproj": "text/plain",
".csh": "application/x-csh",
".csproj": "text/plain",
".css": "text/css",
".csv": "text/csv",
".cur": "application/octet-stream",
".cxx": "text/plain",
".dat": "application/octet-stream",
".datasource": "application/xml",
".dbproj": "text/plain",
".dcr": "application/x-director",
".def": "text/plain",
".deploy": "application/octet-stream",
".der": "application/x-x509-ca-cert",
".dgml": "application/xml",
".dib": "image/bmp",
".dif": "video/x-dv",
".dir": "application/x-director",
".disco": "text/xml",
".dll": "application/x-msdownload",
".dll.config": "text/xml",
".dlm": "text/dlm",
".doc": "application/msword",
".docm": "application/vnd.ms-word.document.macroEnabled.12",
".docx": "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
".dot": "application/msword",
".dotm": "application/vnd.ms-word.template.macroEnabled.12",
".dotx": "application/vnd.openxmlformats-officedocument.wordprocessingml.template",
".dsp": "application/octet-stream",
".dsw": "text/plain",
".dtd": "text/xml",
".dtsConfig": "text/xml",
".dv": "video/x-dv",
".dvi": "application/x-dvi",
".dwf": "drawing/x-dwf",
".dwp": "application/octet-stream",
".dxr": "application/x-director",
".eml": "message/rfc822",
".emz": "application/octet-stream",
".eot": "application/octet-stream",
".eps": "application/postscript",
".etl": "application/etl",
".etx": "text/x-setext",
".evy": "application/envoy",
".exe": "application/octet-stream",
".exe.config": "text/xml",
".fdf": "application/vnd.fdf",
".fif": "application/fractals",
".filters": "Application/xml",
".fla": "application/octet-stream",
".flr": "x-world/x-vrml",
".flv": "video/x-flv",
".fsscript": "application/fsharp-script",
".fsx": "application/fsharp-script",
".generictest": "application/xml",
".gif": "image/gif",
".group": "text/x-ms-group",
".gsm": "audio/x-gsm",
".gtar": "application/x-gtar",
".gz": "application/x-gzip",
".h": "text/plain",
".hdf": "application/x-hdf",
".hdml": "text/x-hdml",
".hhc": "application/x-oleobject",
".hhk": "application/octet-stream",
".hhp": "application/octet-stream",
".hlp": "application/winhlp",
".hpp": "text/plain",
".hqx": "application/mac-binhex40",
".hta": "application/hta",
".htc": "text/x-component",
".htm": "text/html",
".html": "text/html",
".htt": "text/webviewhtml",
".hxa": "application/xml",
".hxc": "application/xml",
".hxd": "application/octet-stream",
".hxe": "application/xml",
".hxf": "application/xml",
".hxh": "application/octet-stream",
".hxi": "application/octet-stream",
".hxk": "application/xml",
".hxq": "application/octet-stream",
".hxr": "application/octet-stream",
".hxs": "application/octet-stream",
".hxt": "text/html",
".hxv": "application/xml",
".hxw": "application/octet-stream",
".hxx": "text/plain",
".i": "text/plain",
".ico": "image/x-icon",
".ics": "application/octet-stream",
".idl": "text/plain",
".ief": "image/ief",
".iii": "application/x-iphone",
".inc": "text/plain",
".inf": "application/octet-stream",
".inl": "text/plain",
".ins": "application/x-internet-signup",
".ipa": "application/x-itunes-ipa",
".ipg": "application/x-itunes-ipg",
".ipproj": "text/plain",
".ipsw": "application/x-itunes-ipsw",
".iqy": "text/x-ms-iqy",
".isp": "application/x-internet-signup",
".ite": "application/x-itunes-ite",
".itlp": "application/x-itunes-itlp",
".itms": "application/x-itunes-itms",
".itpc": "application/x-itunes-itpc",
".IVF": "video/x-ivf",
".jar": "application/java-archive",
".java": "application/octet-stream",
".jck": "application/liquidmotion",
".jcz": "application/liquidmotion",
".jfif": "image/pjpeg",
".jnlp": "application/x-java-jnlp-file",
".jpb": "application/octet-stream",
".jpe": "image/jpeg",
".jpeg": "image/jpeg",
".jpg": "image/jpeg",
".js": "application/x-javascript",
".json": "application/json",
".jsx": "text/jscript",
".jsxbin": "text/plain",
".latex": "application/x-latex",
".library-ms": "application/windows-library+xml",
".lit": "application/x-ms-reader",
".loadtest": "application/xml",
".lpk": "application/octet-stream",
".lsf": "video/x-la-asf",
".lst": "text/plain",
".lsx": "video/x-la-asf",
".lzh": "application/octet-stream",
".m13": "application/x-msmediaview",
".m14": "application/x-msmediaview",
".m1v": "video/mpeg",
".m2t": "video/vnd.dlna.mpeg-tts",
".m2ts": "video/vnd.dlna.mpeg-tts",
".m2v": "video/mpeg",
".m3u": "audio/x-mpegurl",
".m3u8": "audio/x-mpegurl",
".m4a": "audio/m4a",
".m4b": "audio/m4b",
".m4p": "audio/m4p",
".m4r": "audio/x-m4r",
".m4v": "video/x-m4v",
".mac": "image/x-macpaint",
".mak": "text/plain",
".man": "application/x-troff-man",
".manifest": "application/x-ms-manifest",
".map": "text/plain",
".master": "application/xml",
".mda": "application/msaccess",
".mdb": "application/x-msaccess",
".mde": "application/msaccess",
".mdp": "application/octet-stream",
".me": "application/x-troff-me",
".mfp": "application/x-shockwave-flash",
".mht": "message/rfc822",
".mhtml": "message/rfc822",
".mid": "audio/mid",
".midi": "audio/mid",
".mix": "application/octet-stream",
".mk": "text/plain",
".mmf": "application/x-smaf",
".mno": "text/xml",
".mny": "application/x-msmoney",
".mod": "video/mpeg",
".mov": "video/quicktime",
".movie": "video/x-sgi-movie",
".mp2": "video/mpeg",
".mp2v": "video/mpeg",
".mp3": "audio/mpeg",
".mp4": "video/mp4",
".mp4v": "video/mp4",
".mpa": "video/mpeg",
".mpe": "video/mpeg",
".mpeg": "video/mpeg",
".mpf": "application/vnd.ms-mediapackage",
".mpg": "video/mpeg",
".mpp": "application/vnd.ms-project",
".mpv2": "video/mpeg",
".mqv": "video/quicktime",
".ms": "application/x-troff-ms",
".msi": "application/octet-stream",
".mso": "application/octet-stream",
".mts": "video/vnd.dlna.mpeg-tts",
".mtx": "application/xml",
".mvb": "application/x-msmediaview",
".mvc": "application/x-miva-compiled",
".mxp": "application/x-mmxp",
".nc": "application/x-netcdf",
".nsc": "video/x-ms-asf",
".nws": "message/rfc822",
".ocx": "application/octet-stream",
".oda": "application/oda",
".odc": "text/x-ms-odc",
".odh": "text/plain",
".odl": "text/plain",
".odp": "application/vnd.oasis.opendocument.presentation",
".ods": "application/oleobject",
".odt": "application/vnd.oasis.opendocument.text",
".one": "application/onenote",
".onea": "application/onenote",
".onepkg": "application/onenote",
".onetmp": "application/onenote",
".onetoc": "application/onenote",
".onetoc2": "application/onenote",
".orderedtest": "application/xml",
".osdx": "application/opensearchdescription+xml",
".p10": "application/pkcs10",
".p12": "application/x-pkcs12",
".p7b": "application/x-pkcs7-certificates",
".p7c": "application/pkcs7-mime",
".p7m": "application/pkcs7-mime",
".p7r": "application/x-pkcs7-certreqresp",
".p7s": "application/pkcs7-signature",
".pbm": "image/x-portable-bitmap",
".pcast": "application/x-podcast",
".pct": "image/pict",
".pcx": "application/octet-stream",
".pcz": "application/octet-stream",
".pdf": "application/pdf",
".pfb": "application/octet-stream",
".pfm": "application/octet-stream",
".pfx": "application/x-pkcs12",
".pgm": "image/x-portable-graymap",
".pic": "image/pict",
".pict": "image/pict",
".pkgdef": "text/plain",
".pkgundef": "text/plain",
".pko": "application/vnd.ms-pki.pko",
".pls": "audio/scpls",
".pma": "application/x-perfmon",
".pmc": "application/x-perfmon",
".pml": "application/x-perfmon",
".pmr": "application/x-perfmon",
".pmw": "application/x-perfmon",
".png": "image/png",
".pnm": "image/x-portable-anymap",
".pnt": "image/x-macpaint",
".pntg": "image/x-macpaint",
".pnz": "image/png",
".pot": "application/vnd.ms-powerpoint",
".potm": "application/vnd.ms-powerpoint.template.macroEnabled.12",
".potx": "application/vnd.openxmlformats-officedocument.presentationml.template",
".ppa": "application/vnd.ms-powerpoint",
".ppam": "application/vnd.ms-powerpoint.addin.macroEnabled.12",
".ppm": "image/x-portable-pixmap",
".pps": "application/vnd.ms-powerpoint",
".ppsm": "application/vnd.ms-powerpoint.slideshow.macroEnabled.12",
".ppsx": "application/vnd.openxmlformats-officedocument.presentationml.slideshow",
".ppt": "application/vnd.ms-powerpoint",
".pptm": "application/vnd.ms-powerpoint.presentation.macroEnabled.12",
".pptx": "application/vnd.openxmlformats-officedocument.presentationml.presentation",
".prf": "application/pics-rules",
".prm": "application/octet-stream",
".prx": "application/octet-stream",
".ps": "application/postscript",
".psc1": "application/PowerShell",
".psd": "application/octet-stream",
".psess": "application/xml",
".psm": "application/octet-stream",
".psp": "application/octet-stream",
".pub": "application/x-mspublisher",
".pwz": "application/vnd.ms-powerpoint",
".qht": "text/x-html-insertion",
".qhtm": "text/x-html-insertion",
".qt": "video/quicktime",
".qti": "image/x-quicktime",
".qtif": "image/x-quicktime",
".qtl": "application/x-quicktimeplayer",
".qxd": "application/octet-stream",
".ra": "audio/x-pn-realaudio",
".ram": "audio/x-pn-realaudio",
".rar": "application/octet-stream",
".ras": "image/x-cmu-raster",
".rat": "application/rat-file",
".rc": "text/plain",
".rc2": "text/plain",
".rct": "text/plain",
".rdlc": "application/xml",
".resx": "application/xml",
".rf": "image/vnd.rn-realflash",
".rgb": "image/x-rgb",
".rgs": "text/plain",
".rm": "application/vnd.rn-realmedia",
".rmi": "audio/mid",
".rmp": "application/vnd.rn-rn_music_package",
".roff": "application/x-troff",
".rpm": "audio/x-pn-realaudio-plugin",
".rqy": "text/x-ms-rqy",
".rtf": "application/rtf",
".rtx": "text/richtext",
".ruleset": "application/xml",
".s": "text/plain",
".safariextz": "application/x-safari-safariextz",
".scd": "application/x-msschedule",
".sct": "text/scriptlet",
".sd2": "audio/x-sd2",
".sdp": "application/sdp",
".sea": "application/octet-stream",
".searchConnector-ms": "application/windows-search-connector+xml",
".setpay": "application/set-payment-initiation",
".setreg": "application/set-registration-initiation",
".settings": "application/xml",
".sgimb": "application/x-sgimb",
".sgml": "text/sgml",
".sh": "application/x-sh",
".shar": "application/x-shar",
".shtml": "text/html",
".sit": "application/x-stuffit",
".sitemap": "application/xml",
".skin": "application/xml",
".sldm": "application/vnd.ms-powerpoint.slide.macroEnabled.12",
".sldx": "application/vnd.openxmlformats-officedocument.presentationml.slide",
".slk": "application/vnd.ms-excel",
".sln": "text/plain",
".slupkg-ms": "application/x-ms-license",
".smd": "audio/x-smd",
".smi": "application/octet-stream",
".smx": "audio/x-smd",
".smz": "audio/x-smd",
".snd": "audio/basic",
".snippet": "application/xml",
".snp": "application/octet-stream",
".sol": "text/plain",
".sor": "text/plain",
".spc": "application/x-pkcs7-certificates",
".spl": "application/futuresplash",
".src": "application/x-wais-source",
".srf": "text/plain",
".SSISDeploymentManifest": "text/xml",
".ssm": "application/streamingmedia",
".sst": "application/vnd.ms-pki.certstore",
".stl": "application/vnd.ms-pki.stl",
".sv4cpio": "application/x-sv4cpio",
".sv4crc": "application/x-sv4crc",
".svc": "application/xml",
".swf": "application/x-shockwave-flash",
".t": "application/x-troff",
".tar": "application/x-tar",
".tcl": "application/x-tcl",
".testrunconfig": "application/xml",
".testsettings": "application/xml",
".tex": "application/x-tex",
".texi": "application/x-texinfo",
".texinfo": "application/x-texinfo",
".tgz": "application/x-compressed",
".thmx": "application/vnd.ms-officetheme",
".thn": "application/octet-stream",
".tif": "image/tiff",
".tiff": "image/tiff",
".tlh": "text/plain",
".tli": "text/plain",
".toc": "application/octet-stream",
".tr": "application/x-troff",
".trm": "application/x-msterminal",
".trx": "application/xml",
".ts": "video/vnd.dlna.mpeg-tts",
".tsv": "text/tab-separated-values",
".ttf": "application/octet-stream",
".tts": "video/vnd.dlna.mpeg-tts",
".txt": "text/plain",
".u32": "application/octet-stream",
".uls": "text/iuls",
".user": "text/plain",
".ustar": "application/x-ustar",
".vb": "text/plain",
".vbdproj": "text/plain",
".vbk": "video/mpeg",
".vbproj": "text/plain",
".vbs": "text/vbscript",
".vcf": "text/x-vcard",
".vcproj": "Application/xml",
".vcs": "text/plain",
".vcxproj": "Application/xml",
".vddproj": "text/plain",
".vdp": "text/plain",
".vdproj": "text/plain",
".vdx": "application/vnd.ms-visio.viewer",
".vml": "text/xml",
".vscontent": "application/xml",
".vsct": "text/xml",
".vsd": "application/vnd.visio",
".vsi": "application/ms-vsi",
".vsix": "application/vsix",
".vsixlangpack": "text/xml",
".vsixmanifest": "text/xml",
".vsmdi": "application/xml",
".vspscc": "text/plain",
".vss": "application/vnd.visio",
".vsscc": "text/plain",
".vssettings": "text/xml",
".vssscc": "text/plain",
".vst": "application/vnd.visio",
".vstemplate": "text/xml",
".vsto": "application/x-ms-vsto",
".vsw": "application/vnd.visio",
".vsx": "application/vnd.visio",
".vtx": "application/vnd.visio",
".wav": "audio/wav",
".wave": "audio/wav",
".wax": "audio/x-ms-wax",
".wbk": "application/msword",
".wbmp": "image/vnd.wap.wbmp",
".wcm": "application/vnd.ms-works",
".wdb": "application/vnd.ms-works",
".wdp": "image/vnd.ms-photo",
".webarchive": "application/x-safari-webarchive",
".webtest": "application/xml",
".wiq": "application/xml",
".wiz": "application/msword",
".wks": "application/vnd.ms-works",
".WLMP": "application/wlmoviemaker",
".wlpginstall": "application/x-wlpg-detect",
".wlpginstall3": "application/x-wlpg3-detect",
".wm": "video/x-ms-wm",
".wma": "audio/x-ms-wma",
".wmd": "application/x-ms-wmd",
".wmf": "application/x-msmetafile",
".wml": "text/vnd.wap.wml",
".wmlc": "application/vnd.wap.wmlc",
".wmls": "text/vnd.wap.wmlscript",
".wmlsc": "application/vnd.wap.wmlscriptc",
".wmp": "video/x-ms-wmp",
".wmv": "video/x-ms-wmv",
".wmx": "video/x-ms-wmx",
".wmz": "application/x-ms-wmz",
".wpl": "application/vnd.ms-wpl",
".wps": "application/vnd.ms-works",
".wri": "application/x-mswrite",
".wrl": "x-world/x-vrml",
".wrz": "x-world/x-vrml",
".wsc": "text/scriptlet",
".wsdl": "text/xml",
".wvx": "video/x-ms-wvx",
".x": "application/directx",
".xaf": "x-world/x-vrml",
".xaml": "application/xaml+xml",
".xap": "application/x-silverlight-app",
".xbap": "application/x-ms-xbap",
".xbm": "image/x-xbitmap",
".xdr": "text/plain",
".xht": "application/xhtml+xml",
".xhtml": "application/xhtml+xml",
".xla": "application/vnd.ms-excel",
".xlam": "application/vnd.ms-excel.addin.macroEnabled.12",
".xlc": "application/vnd.ms-excel",
".xld": "application/vnd.ms-excel",
".xlk": "application/vnd.ms-excel",
".xll": "application/vnd.ms-excel",
".xlm": "application/vnd.ms-excel",
".xls": "application/vnd.ms-excel",
".xlsb": "application/vnd.ms-excel.sheet.binary.macroEnabled.12",
".xlsm": "application/vnd.ms-excel.sheet.macroEnabled.12",
".xlsx": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
".xlt": "application/vnd.ms-excel",
".xltm": "application/vnd.ms-excel.template.macroEnabled.12",
".xltx": "application/vnd.openxmlformats-officedocument.spreadsheetml.template",
".xlw": "application/vnd.ms-excel",
".xml": "text/xml",
".xmta": "application/xml",
".xof": "x-world/x-vrml",
".XOML": "text/plain",
".xpm": "image/x-xpixmap",
".xps": "application/vnd.ms-xpsdocument",
".xrm-ms": "text/xml",
".xsc": "application/xml",
".xsd": "text/xml",
".xsf": "text/xml",
".xsl": "text/xml",
".xslt": "text/xml",
".xsn": "application/octet-stream",
".xss": "application/xml",
".xtp": "application/octet-stream",
".xwd": "image/x-xwindowdump",
".z": "application/x-compress",
".zip": "application/x-zip-compressed"
}
此处介绍的两种解决方案的组合：
using System;
using System.Collections.Generic;
namespace Mime
{
class Mime
{
public static string GetMimeType(string fileName)
{
if (string.IsNullOrEmpty(fileName) || string.IsNullOrWhiteSpace(fileName))
{
throw new ArgumentNullException("filename must contain a filename");
}
string extension = System.IO.Path.GetExtension(fileName).ToLower();
if (!extension.StartsWith("."))
{
extension = "." + extension;
}
string mime;
if (_mappings.TryGetValue(extension, out mime))
return mime;
if (GetWindowsMimeType(extension, out mime))
{
_mappings.Add(extension, mime);
return mime;
}
return "application/octet-stream";
}
public static bool GetWindowsMimeType(string ext, out string mime)
{
mime="application/octet-stream";
Microsoft.Win32.RegistryKey regKey = Microsoft.Win32.Registry.ClassesRoot.OpenSubKey(ext);
if (regKey != null)
{
object val=regKey.GetValue("Content Type") ;
if (val != null)
{
string strval = val.ToString();
if(!(string.IsNullOrEmpty(strval)||string.IsNullOrWhiteSpace(strval)))
{
mime=strval;
return true;
}
}
}
return false;
}
static IDictionary<string, string> _mappings = new Dictionary<string, string>(StringComparer.InvariantCultureIgnoreCase) {
#region Big freaking list of mime types
// combination of values from Windows 7 Registry and
// from C:\Windows\System32\inetsrv\config\applicationHost.config
// some added, including .7z and .dat
{".323", "text/h323"},
{".3g2", "video/3gpp2"},
{".3gp", "video/3gpp"},
{".3gp2", "video/3gpp2"},
{".3gpp", "video/3gpp"},
{".7z", "application/x-7z-compressed"},
{".aa", "audio/audible"},
{".AAC", "audio/aac"},
{".aaf", "application/octet-stream"},
{".aax", "audio/vnd.audible.aax"},
{".ac3", "audio/ac3"},
{".aca", "application/octet-stream"},
{".accda", "application/msaccess.addin"},
{".accdb", "application/msaccess"},
{".accdc", "application/msaccess.cab"},
{".accde", "application/msaccess"},
{".accdr", "application/msaccess.runtime"},
{".accdt", "application/msaccess"},
{".accdw", "application/msaccess.webapplication"},
{".accft", "application/msaccess.ftemplate"},
{".acx", "application/internet-property-stream"},
{".AddIn", "text/xml"},
{".ade", "application/msaccess"},
{".adobebridge", "application/x-bridge-url"},
{".adp", "application/msaccess"},
{".ADT", "audio/vnd.dlna.adts"},
{".ADTS", "audio/aac"},
{".afm", "application/octet-stream"},
{".ai", "application/postscript"},
{".aif", "audio/x-aiff"},
{".aifc", "audio/aiff"},
{".aiff", "audio/aiff"},
{".air", "application/vnd.adobe.air-application-installer-package+zip"},
{".amc", "application/x-mpeg"},
{".application", "application/x-ms-application"},
{".art", "image/x-jg"},
{".asa", "application/xml"},
{".asax", "application/xml"},
{".ascx", "application/xml"},
{".asd", "application/octet-stream"},
{".asf", "video/x-ms-asf"},
{".ashx", "application/xml"},
{".asi", "application/octet-stream"},
{".asm", "text/plain"},
{".asmx", "application/xml"},
{".aspx", "application/xml"},
{".asr", "video/x-ms-asf"},
{".asx", "video/x-ms-asf"},
{".atom", "application/atom+xml"},
{".au", "audio/basic"},
{".avi", "video/x-msvideo"},
{".axs", "application/olescript"},
{".bas", "text/plain"},
{".bcpio", "application/x-bcpio"},
{".bin", "application/octet-stream"},
{".bmp", "image/bmp"},
{".c", "text/plain"},
{".cab", "application/octet-stream"},
{".caf", "audio/x-caf"},
{".calx", "application/vnd.ms-office.calx"},
{".cat", "application/vnd.ms-pki.seccat"},
{".cc", "text/plain"},
{".cd", "text/plain"},
{".cdda", "audio/aiff"},
{".cdf", "application/x-cdf"},
{".cer", "application/x-x509-ca-cert"},
{".chm", "application/octet-stream"},
{".class", "application/x-java-applet"},
{".clp", "application/x-msclip"},
{".cmx", "image/x-cmx"},
{".cnf", "text/plain"},
{".cod", "image/cis-cod"},
{".config", "application/xml"},
{".contact", "text/x-ms-contact"},
{".coverage", "application/xml"},
{".cpio", "application/x-cpio"},
{".cpp", "text/plain"},
{".crd", "application/x-mscardfile"},
{".crl", "application/pkix-crl"},
{".crt", "application/x-x509-ca-cert"},
{".cs", "text/plain"},
{".csdproj", "text/plain"},
{".csh", "application/x-csh"},
{".csproj", "text/plain"},
{".css", "text/css"},
{".csv", "text/csv"},
{".cur", "application/octet-stream"},
{".cxx", "text/plain"},
{".dat", "application/octet-stream"},
{".datasource", "application/xml"},
{".dbproj", "text/plain"},
{".dcr", "application/x-director"},
{".def", "text/plain"},
{".deploy", "application/octet-stream"},
{".der", "application/x-x509-ca-cert"},
{".dgml", "application/xml"},
{".dib", "image/bmp"},
{".dif", "video/x-dv"},
{".dir", "application/x-director"},
{".disco", "text/xml"},
{".dll", "application/x-msdownload"},
{".dll.config", "text/xml"},
{".dlm", "text/dlm"},
{".doc", "application/msword"},
{".docm", "application/vnd.ms-word.document.macroEnabled.12"},
{".docx", "application/vnd.openxmlformats-officedocument.wordprocessingml.document"},
{".dot", "application/msword"},
{".dotm", "application/vnd.ms-word.template.macroEnabled.12"},
{".dotx", "application/vnd.openxmlformats-officedocument.wordprocessingml.template"},
{".dsp", "application/octet-stream"},
{".dsw", "text/plain"},
{".dtd", "text/xml"},
{".dtsConfig", "text/xml"},
{".dv", "video/x-dv"},
{".dvi", "application/x-dvi"},
{".dwf", "drawing/x-dwf"},
{".dwp", "application/octet-stream"},
{".dxr", "application/x-director"},
{".eml", "message/rfc822"},
{".emz", "application/octet-stream"},
{".eot", "application/octet-stream"},
{".eps", "application/postscript"},
{".etl", "application/etl"},
{".etx", "text/x-setext"},
{".evy", "application/envoy"},
{".exe", "application/octet-stream"},
{".exe.config", "text/xml"},
{".fdf", "application/vnd.fdf"},
{".fif", "application/fractals"},
{".filters", "Application/xml"},
{".fla", "application/octet-stream"},
{".flr", "x-world/x-vrml"},
{".flv", "video/x-flv"},
{".fsscript", "application/fsharp-script"},
{".fsx", "application/fsharp-script"},
{".generictest", "application/xml"},
{".gif", "image/gif"},
{".group", "text/x-ms-group"},
{".gsm", "audio/x-gsm"},
{".gtar", "application/x-gtar"},
{".gz", "application/x-gzip"},
{".h", "text/plain"},
{".hdf", "application/x-hdf"},
{".hdml", "text/x-hdml"},
{".hhc", "application/x-oleobject"},
{".hhk", "application/octet-stream"},
{".hhp", "application/octet-stream"},
{".hlp", "application/winhlp"},
{".hpp", "text/plain"},
{".hqx", "application/mac-binhex40"},
{".hta", "application/hta"},
{".htc", "text/x-component"},
{".htm", "text/html"},
{".html", "text/html"},
{".htt", "text/webviewhtml"},
{".hxa", "application/xml"},
{".hxc", "application/xml"},
{".hxd", "application/octet-stream"},
{".hxe", "application/xml"},
{".hxf", "application/xml"},
{".hxh", "application/octet-stream"},
{".hxi", "application/octet-stream"},
{".hxk", "application/xml"},
{".hxq", "application/octet-stream"},
{".hxr", "application/octet-stream"},
{".hxs", "application/octet-stream"},
{".hxt", "text/html"},
{".hxv", "application/xml"},
{".hxw", "application/octet-stream"},
{".hxx", "text/plain"},
{".i", "text/plain"},
{".ico", "image/x-icon"},
{".ics", "application/octet-stream"},
{".idl", "text/plain"},
{".ief", "image/ief"},
{".iii", "application/x-iphone"},
{".inc", "text/plain"},
{".inf", "application/octet-stream"},
{".inl", "text/plain"},
{".ins", "application/x-internet-signup"},
{".ipa", "application/x-itunes-ipa"},
{".ipg", "application/x-itunes-ipg"},
{".ipproj", "text/plain"},
{".ipsw", "application/x-itunes-ipsw"},
{".iqy", "text/x-ms-iqy"},
{".isp", "application/x-internet-signup"},
{".ite", "application/x-itunes-ite"},
{".itlp", "application/x-itunes-itlp"},
{".itms", "application/x-itunes-itms"},
{".itpc", "application/x-itunes-itpc"},
{".IVF", "video/x-ivf"},
{".jar", "application/java-archive"},
{".java", "application/octet-stream"},
{".jck", "application/liquidmotion"},
{".jcz", "application/liquidmotion"},
{".jfif", "image/pjpeg"},
{".jnlp", "application/x-java-jnlp-file"},
{".jpb", "application/octet-stream"},
{".jpe", "image/jpeg"},
{".jpeg", "image/jpeg"},
{".jpg", "image/jpeg"},
{".js", "application/x-javascript"},
{".jsx", "text/jscript"},
{".jsxbin", "text/plain"},
{".latex", "application/x-latex"},
{".library-ms", "application/windows-library+xml"},
{".lit", "application/x-ms-reader"},
{".loadtest", "application/xml"},
{".lpk", "application/octet-stream"},
{".lsf", "video/x-la-asf"},
{".lst", "text/plain"},
{".lsx", "video/x-la-asf"},
{".lzh", "application/octet-stream"},
{".m13", "application/x-msmediaview"},
{".m14", "application/x-msmediaview"},
{".m1v", "video/mpeg"},
{".m2t", "video/vnd.dlna.mpeg-tts"},
{".m2ts", "video/vnd.dlna.mpeg-tts"},
{".m2v", "video/mpeg"},
{".m3u", "audio/x-mpegurl"},
{".m3u8", "audio/x-mpegurl"},
{".m4a", "audio/m4a"},
{".m4b", "audio/m4b"},
{".m4p", "audio/m4p"},
{".m4r", "audio/x-m4r"},
{".m4v", "video/x-m4v"},
{".mac", "image/x-macpaint"},
{".mak", "text/plain"},
{".man", "application/x-troff-man"},
{".manifest", "application/x-ms-manifest"},
{".map", "text/plain"},
{".master", "application/xml"},
{".mda", "application/msaccess"},
{".mdb", "application/x-msaccess"},
{".mde", "application/msaccess"},
{".mdp", "application/octet-stream"},
{".me", "application/x-troff-me"},
{".mfp", "application/x-shockwave-flash"},
{".mht", "message/rfc822"},
{".mhtml", "message/rfc822"},
{".mid", "audio/mid"},
{".midi", "audio/mid"},
{".mix", "application/octet-stream"},
{".mk", "text/plain"},
{".mmf", "application/x-smaf"},
{".mno", "text/xml"},
{".mny", "application/x-msmoney"},
{".mod", "video/mpeg"},
{".mov", "video/quicktime"},
{".movie", "video/x-sgi-movie"},
{".mp2", "video/mpeg"},
{".mp2v", "video/mpeg"},
{".mp3", "audio/mpeg"},
{".mp4", "video/mp4"},
{".mp4v", "video/mp4"},
{".mpa", "video/mpeg"},
{".mpe", "video/mpeg"},
{".mpeg", "video/mpeg"},
{".mpf", "application/vnd.ms-mediapackage"},
{".mpg", "video/mpeg"},
{".mpp", "application/vnd.ms-project"},
{".mpv2", "video/mpeg"},
{".mqv", "video/quicktime"},
{".ms", "application/x-troff-ms"},
{".msi", "application/octet-stream"},
{".mso", "application/octet-stream"},
{".mts", "video/vnd.dlna.mpeg-tts"},
{".mtx", "application/xml"},
{".mvb", "application/x-msmediaview"},
{".mvc", "application/x-miva-compiled"},
{".mxp", "application/x-mmxp"},
{".nc", "application/x-netcdf"},
{".nsc", "video/x-ms-asf"},
{".nws", "message/rfc822"},
{".ocx", "application/octet-stream"},
{".oda", "application/oda"},
{".odc", "text/x-ms-odc"},
{".odh", "text/plain"},
{".odl", "text/plain"},
{".odp", "application/vnd.oasis.opendocument.presentation"},
{".ods", "application/oleobject"},
{".odt", "application/vnd.oasis.opendocument.text"},
{".one", "application/onenote"},
{".onea", "application/onenote"},
{".onepkg", "application/onenote"},
{".onetmp", "application/onenote"},
{".onetoc", "application/onenote"},
{".onetoc2", "application/onenote"},
{".orderedtest", "application/xml"},
{".osdx", "application/opensearchdescription+xml"},
{".p10", "application/pkcs10"},
{".p12", "application/x-pkcs12"},
{".p7b", "application/x-pkcs7-certificates"},
{".p7c", "application/pkcs7-mime"},
{".p7m", "application/pkcs7-mime"},
{".p7r", "application/x-pkcs7-certreqresp"},
{".p7s", "application/pkcs7-signature"},
{".pbm", "image/x-portable-bitmap"},
{".pcast", "application/x-podcast"},
{".pct", "image/pict"},
{".pcx", "application/octet-stream"},
{".pcz", "application/octet-stream"},
{".pdf", "application/pdf"},
{".pfb", "application/octet-stream"},
{".pfm", "application/octet-stream"},
{".pfx", "application/x-pkcs12"},
{".pgm", "image/x-portable-graymap"},
{".pic", "image/pict"},
{".pict", "image/pict"},
{".pkgdef", "text/plain"},
{".pkgundef", "text/plain"},
{".pko", "application/vnd.ms-pki.pko"},
{".pls", "audio/scpls"},
{".pma", "application/x-perfmon"},
{".pmc", "application/x-perfmon"},
{".pml", "application/x-perfmon"},
{".pmr", "application/x-perfmon"},
{".pmw", "application/x-perfmon"},
{".png", "image/png"},
{".pnm", "image/x-portable-anymap"},
{".pnt", "image/x-macpaint"},
{".pntg", "image/x-macpaint"},
{".pnz", "image/png"},
{".pot", "application/vnd.ms-powerpoint"},
{".potm", "application/vnd.ms-powerpoint.template.macroEnabled.12"},
{".potx", "application/vnd.openxmlformats-officedocument.presentationml.template"},
{".ppa", "application/vnd.ms-powerpoint"},
{".ppam", "application/vnd.ms-powerpoint.addin.macroEnabled.12"},
{".ppm", "image/x-portable-pixmap"},
{".pps", "application/vnd.ms-powerpoint"},
{".ppsm", "application/vnd.ms-powerpoint.slideshow.macroEnabled.12"},
{".ppsx", "application/vnd.openxmlformats-officedocument.presentationml.slideshow"},
{".ppt", "application/vnd.ms-powerpoint"},
{".pptm", "application/vnd.ms-powerpoint.presentation.macroEnabled.12"},
{".pptx", "application/vnd.openxmlformats-officedocument.presentationml.presentation"},
{".prf", "application/pics-rules"},
{".prm", "application/octet-stream"},
{".prx", "application/octet-stream"},
{".ps", "application/postscript"},
{".psc1", "application/PowerShell"},
{".psd", "application/octet-stream"},
{".psess", "application/xml"},
{".psm", "application/octet-stream"},
{".psp", "application/octet-stream"},
{".pub", "application/x-mspublisher"},
{".pwz", "application/vnd.ms-powerpoint"},
{".qht", "text/x-html-insertion"},
{".qhtm", "text/x-html-insertion"},
{".qt", "video/quicktime"},
{".qti", "image/x-quicktime"},
{".qtif", "image/x-quicktime"},
{".qtl", "application/x-quicktimeplayer"},
{".qxd", "application/octet-stream"},
{".ra", "audio/x-pn-realaudio"},
{".ram", "audio/x-pn-realaudio"},
{".rar", "application/octet-stream"},
{".ras", "image/x-cmu-raster"},
{".rat", "application/rat-file"},
{".rc", "text/plain"},
{".rc2", "text/plain"},
{".rct", "text/plain"},
{".rdlc", "application/xml"},
{".resx", "application/xml"},
{".rf", "image/vnd.rn-realflash"},
{".rgb", "image/x-rgb"},
{".rgs", "text/plain"},
{".rm", "application/vnd.rn-realmedia"},
{".rmi", "audio/mid"},
{".rmp", "application/vnd.rn-rn_music_package"},
{".roff", "application/x-troff"},
{".rpm", "audio/x-pn-realaudio-plugin"},
{".rqy", "text/x-ms-rqy"},
{".rtf", "application/rtf"},
{".rtx", "text/richtext"},
{".ruleset", "application/xml"},
{".s", "text/plain"},
{".safariextz", "application/x-safari-safariextz"},
{".scd", "application/x-msschedule"},
{".sct", "text/scriptlet"},
{".sd2", "audio/x-sd2"},
{".sdp", "application/sdp"},
{".sea", "application/octet-stream"},
{".searchConnector-ms", "application/windows-search-connector+xml"},
{".setpay", "application/set-payment-initiation"},
{".setreg", "application/set-registration-initiation"},
{".settings", "application/xml"},
{".sgimb", "application/x-sgimb"},
{".sgml", "text/sgml"},
{".sh", "application/x-sh"},
{".shar", "application/x-shar"},
{".shtml", "text/html"},
{".sit", "application/x-stuffit"},
{".sitemap", "application/xml"},
{".skin", "application/xml"},
{".sldm", "application/vnd.ms-powerpoint.slide.macroEnabled.12"},
{".sldx", "application/vnd.openxmlformats-officedocument.presentationml.slide"},
{".slk", "application/vnd.ms-excel"},
{".sln", "text/plain"},
{".slupkg-ms", "application/x-ms-license"},
{".smd", "audio/x-smd"},
{".smi", "application/octet-stream"},
{".smx", "audio/x-smd"},
{".smz", "audio/x-smd"},
{".snd", "audio/basic"},
{".snippet", "application/xml"},
{".snp", "application/octet-stream"},
{".sol", "text/plain"},
{".sor", "text/plain"},
{".spc", "application/x-pkcs7-certificates"},
{".spl", "application/futuresplash"},
{".src", "application/x-wais-source"},
{".srf", "text/plain"},
{".SSISDeploymentManifest", "text/xml"},
{".ssm", "application/streamingmedia"},
{".sst", "application/vnd.ms-pki.certstore"},
{".stl", "application/vnd.ms-pki.stl"},
{".sv4cpio", "application/x-sv4cpio"},
{".sv4crc", "application/x-sv4crc"},
{".svc", "application/xml"},
{".swf", "application/x-shockwave-flash"},
{".t", "application/x-troff"},
{".tar", "application/x-tar"},
{".tcl", "application/x-tcl"},
{".testrunconfig", "application/xml"},
{".testsettings", "application/xml"},
{".tex", "application/x-tex"},
{".texi", "application/x-texinfo"},
{".texinfo", "application/x-texinfo"},
{".tgz", "application/x-compressed"},
{".thmx", "application/vnd.ms-officetheme"},
{".thn", "application/octet-stream"},
{".tif", "image/tiff"},
{".tiff", "image/tiff"},
{".tlh", "text/plain"},
{".tli", "text/plain"},
{".toc", "application/octet-stream"},
{".tr", "application/x-troff"},
{".trm", "application/x-msterminal"},
{".trx", "application/xml"},
{".ts", "video/vnd.dlna.mpeg-tts"},
{".tsv", "text/tab-separated-values"},
{".ttf", "application/octet-stream"},
{".tts", "video/vnd.dlna.mpeg-tts"},
{".txt", "text/plain"},
{".u32", "application/octet-stream"},
{".uls", "text/iuls"},
{".user", "text/plain"},
{".ustar", "application/x-ustar"},
{".vb", "text/plain"},
{".vbdproj", "text/plain"},
{".vbk", "video/mpeg"},
{".vbproj", "text/plain"},
{".vbs", "text/vbscript"},
{".vcf", "text/x-vcard"},
{".vcproj", "Application/xml"},
{".vcs", "text/plain"},
{".vcxproj", "Application/xml"},
{".vddproj", "text/plain"},
{".vdp", "text/plain"},
{".vdproj", "text/plain"},
{".vdx", "application/vnd.ms-visio.viewer"},
{".vml", "text/xml"},
{".vscontent", "application/xml"},
{".vsct", "text/xml"},
{".vsd", "application/vnd.visio"},
{".vsi", "application/ms-vsi"},
{".vsix", "application/vsix"},
{".vsixlangpack", "text/xml"},
{".vsixmanifest", "text/xml"},
{".vsmdi", "application/xml"},
{".vspscc", "text/plain"},
{".vss", "application/vnd.visio"},
{".vsscc", "text/plain"},
{".vssettings", "text/xml"},
{".vssscc", "text/plain"},
{".vst", "application/vnd.visio"},
{".vstemplate", "text/xml"},
{".vsto", "application/x-ms-vsto"},
{".vsw", "application/vnd.visio"},
{".vsx", "application/vnd.visio"},
{".vtx", "application/vnd.visio"},
{".wav", "audio/wav"},
{".wave", "audio/wav"},
{".wax", "audio/x-ms-wax"},
{".wbk", "application/msword"},
{".wbmp", "image/vnd.wap.wbmp"},
{".wcm", "application/vnd.ms-works"},
{".wdb", "application/vnd.ms-works"},
{".wdp", "image/vnd.ms-photo"},
{".webarchive", "application/x-safari-webarchive"},
{".webtest", "application/xml"},
{".wiq", "application/xml"},
{".wiz", "application/msword"},
{".wks", "application/vnd.ms-works"},
{".WLMP", "application/wlmoviemaker"},
{".wlpginstall", "application/x-wlpg-detect"},
{".wlpginstall3", "application/x-wlpg3-detect"},
{".wm", "video/x-ms-wm"},
{".wma", "audio/x-ms-wma"},
{".wmd", "application/x-ms-wmd"},
{".wmf", "application/x-msmetafile"},
{".wml", "text/vnd.wap.wml"},
{".wmlc", "application/vnd.wap.wmlc"},
{".wmls", "text/vnd.wap.wmlscript"},
{".wmlsc", "application/vnd.wap.wmlscriptc"},
{".wmp", "video/x-ms-wmp"},
{".wmv", "video/x-ms-wmv"},
{".wmx", "video/x-ms-wmx"},
{".wmz", "application/x-ms-wmz"},
{".wpl", "application/vnd.ms-wpl"},
{".wps", "application/vnd.ms-works"},
{".wri", "application/x-mswrite"},
{".wrl", "x-world/x-vrml"},
{".wrz", "x-world/x-vrml"},
{".wsc", "text/scriptlet"},
{".wsdl", "text/xml"},
{".wvx", "video/x-ms-wvx"},
{".x", "application/directx"},
{".xaf", "x-world/x-vrml"},
{".xaml", "application/xaml+xml"},
{".xap", "application/x-silverlight-app"},
{".xbap", "application/x-ms-xbap"},
{".xbm", "image/x-xbitmap"},
{".xdr", "text/plain"},
{".xht", "application/xhtml+xml"},
{".xhtml", "application/xhtml+xml"},
{".xla", "application/vnd.ms-excel"},
{".xlam", "application/vnd.ms-excel.addin.macroEnabled.12"},
{".xlc", "application/vnd.ms-excel"},
{".xld", "application/vnd.ms-excel"},
{".xlk", "application/vnd.ms-excel"},
{".xll", "application/vnd.ms-excel"},
{".xlm", "application/vnd.ms-excel"},
{".xls", "application/vnd.ms-excel"},
{".xlsb", "application/vnd.ms-excel.sheet.binary.macroEnabled.12"},
{".xlsm", "application/vnd.ms-excel.sheet.macroEnabled.12"},
{".xlsx", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"},
{".xlt", "application/vnd.ms-excel"},
{".xltm", "application/vnd.ms-excel.template.macroEnabled.12"},
{".xltx", "application/vnd.openxmlformats-officedocument.spreadsheetml.template"},
{".xlw", "application/vnd.ms-excel"},
{".xml", "text/xml"},
{".xmta", "application/xml"},
{".xof", "x-world/x-vrml"},
{".XOML", "text/plain"},
{".xpm", "image/x-xpixmap"},
{".xps", "application/vnd.ms-xpsdocument"},
{".xrm-ms", "text/xml"},
{".xsc", "application/xml"},
{".xsd", "text/xml"},
{".xsf", "text/xml"},
{".xsl", "text/xml"},
{".xslt", "text/xml"},
{".xsn", "application/octet-stream"},
{".xss", "application/xml"},
{".xtp", "application/octet-stream"},
{".xwd", "image/x-xwindowdump"},
{".z", "application/x-compress"},
{".zip", "application/x-zip-compressed"},
#endregion
};
}
}
为了使帖子更全面，对于 .NET Core 开发人员，有 FileExtensionContentTypeProvider 类，它涵盖了官方的 MIME content types。
它在幕后工作 - 根据文件扩展名在 Http 响应标头中设置 ContentType。
如果您需要特殊的 MIME 类型，请参阅 example on customising the MIME types：
public void Configure(IApplicationBuilder app)
{
// Set up custom content types -associating file extension to MIME type
var provider = new FileExtensionContentTypeProvider();
// Add new mappings
provider.Mappings[".myapp"] = "application/x-msdownload";
provider.Mappings[".htm3"] = "text/html";
provider.Mappings[".image"] = "image/png";
// Replace an existing mapping
provider.Mappings[".rtf"] = "application/x-msdownload";
// Remove MP4 videos.
provider.Mappings.Remove(".mp4");
app.UseStaticFiles(new StaticFileOptions()
{
FileProvider = new PhysicalFileProvider(
Path.Combine(Directory.GetCurrentDirectory(), @"wwwroot", "images")),
RequestPath = new PathString("/MyImages"),
ContentTypeProvider = provider
});
app.UseDirectoryBrowser(new DirectoryBrowserOptions()
{
FileProvider = new PhysicalFileProvider(
Path.Combine(Directory.GetCurrentDirectory(), @"wwwroot", "images")),
RequestPath = new PathString("/MyImages")
});
}
大多数解决方案都有效，但为什么要如此努力，而我们也可以很容易地获得 mime 类型。在 System.Web 程序集中，有一种方法可以从文件名中获取 mime 类型。例如：
string mimeType = MimeMapping.GetMimeMapping(filename);
.Net 框架提供了获取 mime 类型的内置方法。无需编写自定义代码。
字符串 mimeType = System.Web.MimeMapping.GetMimeMapping(fileName);
.NET Core 获取 MimeType 的方法：
添加依赖
Microsoft.AspNetCore.StaticFiles
private string GetMimeType(string fileName)
{
var provider = new FileExtensionContentTypeProvider();
if (!provider.TryGetContentType(fileName, out var contentType))
{
contentType = "application/octet-stream";
}
return contentType;
}
使用 MimeTypeMap 包，它提供了文件扩展名到 mime 类型和 mime 类型到文件扩展名的巨大双向映射
使用 MimeTypes；
将 mime 类型添加到扩展
Console.WriteLine("txt -> " + MimeTypeMap.GetMimeType("txt")); // "text/plain"
获取 mime 类型的扩展
Console.WriteLine("audio/wav -> " + MimeTypeMap.GetExtension("audio/wav")); // ".wav"
GitHub 网址：https://github.com/samuelneff/MimeTypeMap
受塞缪尔回答的启发，我写了一个改进版：
当扩展名是大写时也有效。
以文件名作为输入，优雅地处理没有扩展名的文件。
不要包括“。”在键中。
来自 Apache 的列表，我为此编写了一个小型转换脚本。
生成的源代码超过 30K 个字符，因此我无法在此处发布，请检查 on Github。
https://i.stack.imgur.com/XBk8f.png
HttpResponseMessage 从 Web API 返回某些内容时不想要魔术字符串，则 MediaTypeNames 会很方便，但它实际上与 OP 所要求的相反。
我对这些 mimetypes 的看法，使用 apache 列表，下面的脚本将为您提供一个包含所有 mimetypes 的字典。
var mimeTypeListUrl = "http://svn.apache.org/repos/asf/httpd/httpd/trunk/docs/conf/mime.types";
var webClient = new WebClient();
var rawData = webClient.DownloadString(mimeTypeListUrl).Split(new[] { Environment.NewLine, "\n" }, StringSplitOptions.RemoveEmptyEntries);
var extensionToMimeType = new Dictionary<string, string>();
var mimeTypeToExtension = new Dictionary<string, string[]>();
foreach (var row in rawData)
{
if (row.StartsWith("#")) continue;
var rowData = row.Split(new[] { "\t" }, StringSplitOptions.RemoveEmptyEntries);
if (rowData.Length != 2) continue;
var extensions = rowData[1].Split(new[] { " " }, StringSplitOptions.RemoveEmptyEntries);
if (!mimeTypeToExtension.ContainsKey(rowData[0]))
{
mimeTypeToExtension.Add(rowData[0], extensions);
}
foreach (var extension in extensions)
{
if (!extensionToMimeType.ContainsKey(extension))
{
extensionToMimeType.Add(extension, rowData[0]);
}
}
}
您不应该相信来自客户端的文件扩展名。始终检查文件的幻数。
将 FileTpeInterrogator 与 ASP.NET Core 一起使用：
public static class FileTypeChecker
{
private static List<string> validVideoMimeTypes = new List<string> { "video/mp4", "video/quicktime" };
private static List<string> validImageMimeTypes = new List<string> { "image/png", "image/jpeg" };
public static bool IsValidVideo(IFormFile file)
{
return validVideoMimeTypes.Contains(GetFileMimeType(file));
}
public static bool IsValidImage(IFormFile file)
{
return validImageMimeTypes.Contains(GetFileMimeType(file));
}
private static string GetFileMimeType(IFormFile file)
{
// You should have checked for null and file length before reaching here
IFileTypeInterrogator interrogator = new FileTypeInterrogator.FileTypeInterrogator();
byte[] fileBytes;
using (var stream = new MemoryStream())
{
file.CopyTo(stream);
fileBytes = stream.ToArray();
}
FileTypeInfo fileTypeInfo = interrogator.DetectType(fileBytes);
return fileTypeInfo.MimeType.ToLower();
}
}
在您的控制器或服务内部：
public IActionResult UploadVideo([FromForm] UploadVideoVM model)
{
if (model.File.Length < minimumLength || model.File.Length > maximumLength)
{
// BadRequest => Size
}
else if (!FileTypeChecker.IsValidVideo(model.File))
{
// BadRequest => Type
}
else
{
// All good
}
return Ok();
}
要获取文件扩展名的 MIME 类型，请参阅 this file。
这个帮助类返回任何文件名的 mime 类型（内容类型）、描述和图标：
using Microsoft.Win32;
using System;
using System.Drawing;
using System.IO;
using System.Runtime.InteropServices;
public static class Helper
{
[DllImport("shell32.dll", CharSet = CharSet.Auto)]
private static extern int ExtractIconEx(string lpszFile, int nIconIndex, IntPtr[] phIconLarge, IntPtr[] phIconSmall, int nIcons);
[DllImport("user32.dll", SetLastError = true)]
private static extern int DestroyIcon(IntPtr hIcon);
public static string GetFileContentType(string fileName)
{
if (fileName == null)
{
throw new ArgumentNullException("fileName");
}
RegistryKey registryKey = null;
try
{
FileInfo fileInfo = new FileInfo(fileName);
if (string.IsNullOrEmpty(fileInfo.Extension))
{
return string.Empty;
}
string extension = fileInfo.Extension.ToLowerInvariant();
registryKey = Registry.ClassesRoot.OpenSubKey(extension);
if (registryKey == null)
{
return string.Empty;
}
object contentTypeObject = registryKey.GetValue("Content Type");
if (!(contentTypeObject is string))
{
return string.Empty;
}
string contentType = (string)contentTypeObject;
return contentType;
}
catch (Exception)
{
return null;
}
finally
{
if (registryKey != null)
{
registryKey.Close();
}
}
}
public static string GetFileDescription(string fileName)
{
if (fileName == null)
{
throw new ArgumentNullException("fileName");
}
RegistryKey registryKey1 = null;
RegistryKey registryKey2 = null;
try
{
FileInfo fileInfo = new FileInfo(fileName);
if (string.IsNullOrEmpty(fileInfo.Extension))
{
return string.Empty;
}
string extension = fileInfo.Extension.ToLowerInvariant();
registryKey1 = Registry.ClassesRoot.OpenSubKey(extension);
if (registryKey1 == null)
{
return string.Empty;
}
object extensionDefaultObject = registryKey1.GetValue(null);
if (!(extensionDefaultObject is string))
{
return string.Empty;
}
string extensionDefaultValue = (string)extensionDefaultObject;
registryKey2 = Registry.ClassesRoot.OpenSubKey(extensionDefaultValue);
if (registryKey2 == null)
{
return string.Empty;
}
object fileDescriptionObject = registryKey2.GetValue(null);
if (!(fileDescriptionObject is string))
{
return string.Empty;
}
string fileDescription = (string)fileDescriptionObject;
return fileDescription;
}
catch (Exception)
{
return null;
}
finally
{
if (registryKey2 != null)
{
registryKey2.Close();
}
if (registryKey1 != null)
{
registryKey1.Close();
}
}
}
public static void GetFileIcons(string fileName, out Icon smallIcon, out Icon largeIcon)
{
if (fileName == null)
{
throw new ArgumentNullException("fileName");
}
smallIcon = null;
largeIcon = null;
RegistryKey registryKey1 = null;
RegistryKey registryKey2 = null;
try
{
FileInfo fileInfo = new FileInfo(fileName);
if (string.IsNullOrEmpty(fileInfo.Extension))
{
return;
}
string extension = fileInfo.Extension.ToLowerInvariant();
registryKey1 = Registry.ClassesRoot.OpenSubKey(extension);
if (registryKey1 == null)
{
return;
}
object extensionDefaultObject = registryKey1.GetValue(null);
if (!(extensionDefaultObject is string))
{
return;
}
string defaultIconKeyName = string.Format("{0}\\DefaultIcon", extensionDefaultObject);
registryKey2 = Registry.ClassesRoot.OpenSubKey(defaultIconKeyName);
if (registryKey2 == null)
{
return;
}
object defaultIconPathObject = registryKey2.GetValue(null);
if (!(defaultIconPathObject is string))
{
return;
}
string defaultIconPath = (string)defaultIconPathObject;
if (string.IsNullOrWhiteSpace(defaultIconPath))
{
return;
}
string iconfileName = null;
int iconIndex = 0;
int commaIndex = defaultIconPath.IndexOf(",");
if (commaIndex > 0)
{
iconfileName = defaultIconPath.Substring(0, commaIndex);
string iconIndexString = defaultIconPath.Substring(commaIndex + 1);
if (!int.TryParse(iconIndexString, out iconIndex))
{
iconIndex = 0;
}
}
else
{
iconfileName = defaultIconPath;
iconIndex = 0;
}
IntPtr[] phiconSmall = new IntPtr[1] { IntPtr.Zero };
IntPtr[] phiconLarge = new IntPtr[1] { IntPtr.Zero };
int readIconCount = ExtractIconEx(iconfileName, iconIndex, phiconLarge, phiconSmall, 1);
if (readIconCount < 0)
{
return;
}
if (phiconSmall[0] != IntPtr.Zero)
{
smallIcon = (Icon)Icon.FromHandle(phiconSmall[0]).Clone();
DestroyIcon(phiconSmall[0]);
}
if (phiconLarge[0] != IntPtr.Zero)
{
largeIcon = (Icon)Icon.FromHandle(phiconLarge[0]).Clone();
DestroyIcon(phiconLarge[0]);
}
return;
}
finally
{
if (registryKey2 != null)
{
registryKey2.Close();
}
if (registryKey1 != null)
{
registryKey1.Close();
}
}
}
}
用法：
string fileName = "NotExists.txt";
string contentType = Helper.GetFileContentType(fileName); // "text/plain"
string description = Helper.GetFileDescription(fileName); // "Text Document"
Icon smallIcon, largeIcon;
Helper.GetFileIcons(fileName, out smallIcon, out largeIcon); // 16x16, 32x32 icons
如果您不想添加额外的依赖项并且仍然需要版本无关的请求，您可以将 this answer on how to get the MIME-Type in different .NET versions 与 this answer on conditional builds for multiple .NET Framework versions 混合使用。
我做的第一件事是编辑我的项目文件。在最后一个构建定义之后，我添加了第二个答案中所述的属性组：
<PropertyGroup>
<DefineConstants Condition=" !$(DefineConstants.Contains(';NET')) ">$(DefineConstants);$(TargetFrameworkVersion.Replace("v", "NET").Replace(".", ""))</DefineConstants>
<DefineConstants Condition=" $(DefineConstants.Contains(';NET')) ">$(DefineConstants.Remove($(DefineConstants.LastIndexOf(";NET"))));$(TargetFrameworkVersion.Replace("v", "NET").Replace(".", ""))</DefineConstants>
</PropertyGroup>
现在，我为第一个答案中的 MimeExtensionHelper 提供了不同的实现，并为来自 .NET 4.5 或更高版本的所有客户端提供了一个额外的实现，只需调用 System.Web.MimeMapping.GetMimeMapping：
#if (NET10 || NET11 || NET20 || NET30 || NET35)
public static class MimeExtensionHelper
{
static object locker = new object();
static MethodInfo getMimeMappingMethodInfo;
static MimeExtensionHelper()
{
Type mimeMappingType = Assembly.GetAssembly(typeof(HttpRuntime)).GetType("System.Web.MimeMapping");
if (mimeMappingType == null)
throw new SystemException("Couldnt find MimeMapping type");
ConstructorInfo constructorInfo = mimeMappingType.GetConstructor(BindingFlags.NonPublic | BindingFlags.Instance, null, Type.EmptyTypes, null);
if (constructorInfo == null)
throw new SystemException("Couldnt find default constructor for MimeMapping");
mimeMapping = constructorInfo.Invoke(null);
if (mimeMapping == null)
throw new SystemException("Couldnt find MimeMapping");
getMimeMappingMethodInfo = mimeMappingType.GetMethod("GetMimeMapping", BindingFlags.Static | BindingFlags.NonPublic);
if (getMimeMappingMethodInfo == null)
throw new SystemException("Couldnt find GetMimeMapping method");
if (getMimeMappingMethodInfo.ReturnType != typeof(string))
throw new SystemException("GetMimeMapping method has invalid return type");
if (getMimeMappingMethodInfo.GetParameters().Length != 1 && getMimeMappingMethodInfo.GetParameters()[0].ParameterType != typeof(string))
throw new SystemException("GetMimeMapping method has invalid parameters");
}
public static string GetMimeType(string fileName)
{
lock (locker)
{
return (string)getMimeMappingMethodInfo.Invoke(null, new object[] { fileName });
}
}
}
#elif NET40
public static class MimeExtensionHelper
{
static object locker = new object();
static MethodInfo getMimeMappingMethodInfo;
static MimeExtensionHelper()
{
Type mimeMappingType = Assembly.GetAssembly(typeof(HttpRuntime)).GetType("System.Web.MimeMapping");
if (mimeMappingType == null)
throw new SystemException("Couldnt find MimeMapping type");
getMimeMappingMethodInfo = mimeMappingType.GetMethod("GetMimeMapping", BindingFlags.Static | BindingFlags.NonPublic | BindingFlags.Public);
if (getMimeMappingMethodInfo == null)
throw new SystemException("Couldnt find GetMimeMapping method");
if (getMimeMappingMethodInfo.ReturnType != typeof(string))
throw new SystemException("GetMimeMapping method has invalid return type");
if (getMimeMappingMethodInfo.GetParameters().Length != 1 && getMimeMappingMethodInfo.GetParameters()[0].ParameterType != typeof(string))
throw new SystemException("GetMimeMapping method has invalid parameters");
}
public static string GetMimeType(string fileName)
{
lock (locker)
{
return (string)getMimeMappingMethodInfo.Invoke(null, new object[] { fileName });
}
}
}
#else // .NET 4.5 or later
public static class MimeExtensionHelper
{
public static string GetMimeType(string fileName)
{
return MimeMapping.GetMimeMapping(fileName);
}
}
#endif
同样在 .NET 4.5 之前的版本中，静态 MimeMapping 类托管一个名为 _mappingDictionary（类型为 MimeMapping.MimeMappingDictionaryBase）的静态实例，您可以从 Reflection 请求它以添加可能尚未添加的新 MIME 类型支持的。
由文件扩展名计算出的 mime 类型总是没有必要总是正确的。
假设我可以保存扩展名为 .png 的文件，但我可以将文件格式设置为“ImageFormat.jpeg”。
因此，在这种情况下，您将要计算的文件会给出不同的结果......它可能会导致文件比原始文件大。
如果您正在处理图像，则可以使用 imagecodecInfo 和 ImageFormat。
Bryan Denny 上面的帖子对我不起作用，因为并非所有扩展在注册表中都有“内容类型”子键。我不得不调整代码如下：
private string GetMimeType(string sFileName)
{
// Get file extension and if it is empty, return unknown
string sExt = Path.GetExtension(sFileName);
if (string.IsNullOrEmpty(sExt)) return "Unknown file type";
// Default type is "EXT File"
string mimeType = string.Format("{0} File", sExt.ToUpper().Replace(".", ""));
// Open the registry key for the extension under HKEY_CLASSES_ROOT and return default if it doesn't exist
Microsoft.Win32.RegistryKey regKey = Microsoft.Win32.Registry.ClassesRoot.OpenSubKey(sExt);
if (regKey == null) return mimeType;
// Get the "(Default)" value and re-open the key for that value
string sSubType = regKey.GetValue("").ToString();
regKey = Microsoft.Win32.Registry.ClassesRoot.OpenSubKey(sSubType);
// If it exists, get the "(Default)" value of the new key
if (regKey?.GetValue("") != null) mimeType = regKey.GetValue("").ToString();
// Return the value
return mimeType;
}
现在它适用于所有注册文件类型和未注册或通用文件类型（如 JPG 等）。
我已经为 mime 类型和内容类型值编制了一个信誉良好的来源列表，这些值仅在文件扩展名上键入（当前）。
nuget 包在这里 https://www.nuget.org/packages/FTTLib.dll/
来源在这里https://github.com/brondavies/filetypetranslator/
该库旨在具有：
没有外部依赖
没有文件系统访问权限
内存占用小
简单的静态方法（没有扩展方法和可实例化的类）
不区分大小写
便携 - 适用于针对任何 CLR (.NET 2.0+) 的应用程序
如果有人可以使用与 Linux 上的 libmagic 类似的功能会更好，因为我认为这是检测文件类型的更好方法，而不是中继文件的扩展名。
例如，如果我将一个文件从 mypicture.jpg 重命名为 mypicture.txt 在 linux 上，它仍然会被报告为图片，但是在这里使用这种方法，它会被报告为文本文件。
问候托马斯
IANA 媒体类型
我希望微软能一起制定他们的行业标准法案！对于其他人，任何感兴趣的人：
离散类型
申请：https://www.iana.org/assignments/media-types/media-types.xhtml#application
音频：https://www.iana.org/assignments/media-types/media-types.xhtml#audio
示例：https://www.iana.org/assignments/media-types/media-types.xhtml#examples
字体：https://www.iana.org/assignments/media-types/media-types.xhtml#font
图片：https://www.iana.org/assignments/media-types/media-types.xhtml#image
型号：https://www.iana.org/assignments/media-types/media-types.xhtml#model
文本：https://www.iana.org/assignments/media-types/media-types.xhtml#text
视频：https://www.iana.org/assignments/media-types/media-types.xhtml#video
多部分类型
消息：https://www.iana.org/assignments/media-types/media-types.xhtml#message
多部分：https://www.iana.org/assignments/media-types/media-types.xhtml#multipart
我想向感兴趣的人推荐阅读：MIME types (IANA media types) Mozilla 页面！它的信息量很大！
代码方面，上述每个链接都有一个 .csv 文件下载：https://www.iana.org/assignments/media-types/application.csv
正如这里已经指出的那样，字典或 ConcurrentDictionary 可能是使用键值对下载和填充字典的想法。
我对脚本做了一些更新。以防万一有人需要
function getMime(){ let ext = fileUpload.value.split('.')[1];让 myOutput = getMimeType(ext); mimeType.value=我的输出； } 函数 getMimeType(ext) { if (!ext.startsWith(".")) { ext = "." +分机； } let myList = [ {"key": ".323", "value": "text/h323"}, {"key": ".3g2", "value": "video/3gpp2"}, {"key ": ".3gp", "value": "video/3gpp"}, {"key": ".3gp2", "value": "video/3gpp2"}, {"key": ".3gpp", " value": "video/3gpp"}, {"key": ".7z", "value": "application/x-7z-compressed"}, {"key": ".aa", "value": " audio/audible"}, {"key": ".AAC", "value": "audio/aac"}, {"key": ".aaf", "value": "application/octet-stream"}, {“key”：“.aax”，“value”：“audio/vnd.audible.aax”}，{“key”：“.ac3”，“value”：“audio/ac3”}，{“key” : ".aca", "value": "application/octet-stream"}, {"key": ".accda", "value": "application/msaccess.addin"}, {"key": ".accdb ", "value": "application/msaccess"}, {"key": ".accdc", "value": "application/msaccess.cab"}, {"key": ".accde", "value": “application/msaccess”}，{“key”：“.accdr”，“value”：“application/msaccess.runtime”}，{“key”：“.accdt”，“value”：“application/msaccess”} , {"key": ".accdw", "value": "application/msaccess.webapplication"}, {"key": ".accft", "value": "application/msaccess .ftemplate"}, {"key": ".acx", "value": "application/internet-property-stream"}, {"key": ".AddIn", "value": "text/xml"} , {"key": ".ade", "value": "application/msaccess"}, {"key": ".adobebridge", "value": "application/x-bridge-url"}, {"key ": ".adp", "value": "application/msaccess"}, {"key": ".ADT", "value": "audio/vnd.dlna.adts"}, {"key": ". ADTS", "value": "audio/aac"}, {"key": ".afm", "value": "application/octet-stream"}, {"key": ".ai", "value" : "application/postscript"}, {"key": ".aif", "value": "audio/x-aiff"}, {"key": ".aifc", "value": "audio/aiff" }，{“key”：“.aiff”，“value”：“audio/aiff”}，{“key”：“.air”，“value”：“application/vnd.adobe.air-application-installer- package+zip"}, {"key": ".amc", "value": "application/x-mpeg"}, {"key": ".application", "value": "application/x-ms-应用程序"}，{"key"：".art"，"value"："image/x-jg"}，{"key"：".asa"，"value"："application/xml"}，{"键”：“.asax”，“值”：“应用程序/xml”}，{“键”：“.ascx”，“值”：“应用程序/xml”}，{“键”：“.asd”， “瓦尔ue": "application/octet-stream"}, {"key": ".asf", "value": "video/x-ms-asf"}, {"key": ".ashx", "value" : "application/xml"}, {"key": ".asi", "value": "application/octet-stream"}, {"key": ".asm", "value": "text/plain" }，{“key”：“.asmx”，“value”：“application/xml”}，{“key”：“.aspx”，“value”：“application/xml”}，{“key”：“ .asr", "value": "video/x-ms-asf"}, {"key": ".asx", "value": "video/x-ms-asf"}, {"key": " .atom", "value": "application/atom+xml"}, {"key": ".au", "value": "audio/basic"}, {"key": ".avi", "value ": "video/x-msvideo"}, {"key": ".axs", "value": "application/olescript"}, {"key": ".bas", "value": "text/plain "}, {"key": ".bcpio", "value": "application/x-bcpio"}, {"key": ".bin", "value": "application/octet-stream"}, { “key”：“.bmp”，“value”：“image/bmp”}，{“key”：“.c”，“value”：“text/plain”}，{“key”：“.cab” , "value": "application/octet-stream"}, {"key": ".caf", "value": "audio/x-caf"}, {"key": ".calx", "value" ：“应用程序/vnd.ms-office.calx”}，{“键”：“.cat”，“值”：“应用程序/vnd.ms-pki.seccat"}, {"key": ".cc", "value": "text/plain"}, {"key": ".cd", "value": "text/plain" "}, {"key": ".cdda", "value": "audio/aiff"}, {"key": ".cdf", "value": "application/x-cdf"}, {"key ": ".cer", "value": "application/x-x509-ca-cert"}, {"key": ".chm", "value": "application/octet-stream"}, {"key ": ".class", "value": "application/x-java-applet"}, {"key": ".clp", "value": "application/x-msclip"}, {"key": ".cmx", "value": "image/x-cmx"}, {"key": ".cnf", "value": "text/plain"}, {"key": ".cod", "值”：“image/cis-cod”}，{“key”：“.config”，“value”：“application/xml”}，{“key”：“.contact”，“value”：“text/ x-ms-contact"}, {"key": ".coverage", "value": "application/xml"}, {"key": ".cpio", "value": "application/x-cpio" }，{“key”：“.cpp”，“value”：“text/plain”}，{“key”：“.crd”，“value”：“application/x-mscardfile”}，{“key” : ".crl", "value": "application/pkix-crl"}, {"key": ".crt", "value": "application/x-x509-ca-cert"}, {"key" : ".cs", "value": "text/plain"}, {"key": ".csdproj", "value": "text /plain"}, {"key": ".csh", "value": "application/x-csh"}, {"key": ".csproj", "value": "text/plain"}, { “key”：“.css”，“value”：“text/css”}，{“key”：“.csv”，“value”：“text/csv”}，{“key”：“.cur” , "value": "application/octet-stream"}, {"key": ".cxx", "value": "text/plain"}, {"key": ".dat", "value": " application/octet-stream"}, {"key": ".datasource", "value": "application/xml"}, {"key": ".dbproj", "value": "text/plain"}, {“key”：“.dcr”，“value”：“application/x-director”}，{“key”：“.def”，“value”：“text/plain”}，{“key”：“ .deploy", "value": "application/octet-stream"}, {"key": ".der", "value": "application/x-x509-ca-cert"}, {"key": " .dgml", "value": "application/xml"}, {"key": ".dib", "value": "image/bmp"}, {"key": ".dif", "value": “video/x-dv”}，{“key”：“.dir”，“value”：“application/x-director”}，{“key”：“.disco”，“value”：“text/xml "}, {"key": ".dll", "value": "application/x-msdownload"}, {"key": ".dll.config", "value": "text/xml"}, { “key”：“.dlm”，“value”：“text/dlm”}，{“key”：“.doc”，“value” ": "application/msword"}, {"key": ".docm", "value": "application/vnd.ms-word.document.macroEnabled.12"}, {"key": ".docx", "value": "application/vnd.openxmlformats-officedocument.wordprocessingml.document"}, {"key": ".dot", "value": "application/msword"}, {"key": ".dotm", “值”：“应用程序/vnd.ms-word.template.macroEnabled.12”}，{“键”：“.dotx”，“值”：“应用程序/vnd.openxmlformats-officedocument.wordprocessingml.template”}， {“key”：“.dsp”，“value”：“application/octet-stream”}，{“key”：“.dsw”，“value”：“text/plain”}，{“key”：“ .dtd", "value": "text/xml"}, {"key": ".dtsConfig", "value": "text/xml"}, {"key": ".dv", "value": “video/x-dv”}，{“key”：“.dvi”，“value”：“application/x-dvi”}，{“key”：“.dwf”，“value”：“drawing/x -dwf"}, {"key": ".dwp", "value": "application/octet-stream"}, {"key": ".dxr", "value": "application/x-director"} , {"key": ".eml", "value": "message/rfc822"}, {"key": ".emz", "value": "application/octet-stream"}, {"key": ".eot", "value": "application/octet-stream"}, { “key”：“.eps”，“value”：“application/postscript”}，{“key”：“.etl”，“value”：“application/etl”}，{“key”：“.etx” , "value": "text/x-setext"}, {"key": ".evy", "value": "application/envoy"}, {"key": ".exe", "value": " application/octet-stream"}, {"key": ".exe.config", "value": "text/xml"}, {"key": ".fdf", "value": "application/vnd. fdf"}, {"key": ".fif", "value": "application/fractals"}, {"key": ".filters", "value": "Application/xml"}, {"key" : ".fla", "value": "application/octet-stream"}, {"key": ".flr", "value": "x-world/x-vrml"}, {"key": " .flv", "value": "video/x-flv"}, {"key": ".fsscript", "value": "application/fsharp-script"}, {"key": ".fsx", "value": "application/fsharp-script"}, {"key": ".generictest", "value": "application/xml"}, {"key": ".gif", "value": "image /gif"}, {"key": ".group", "value": "text/x-ms-group"}, {"key": ".gsm", "value": "audio/x-gsm "}, {"key": ".gtar", "value": "application/x-gtar"}, {"key": ".gz", "value": "application/x-gzip"}, { “键”：“.h”，“值”：“文本/纯文本”}， {“key”：“.hdf”，“value”：“application/x-hdf”}，{“key”：“.hdml”，“value”：“text/x-hdml”}，{“key” : ".hhc", "value": "application/x-oleobject"}, {"key": ".hhk", "value": "application/octet-stream"}, {"key": ".hhp ", "value": "application/octet-stream"}, {"key": ".hlp", "value": "application/winhlp"}, {"key": ".hpp", "value": “text/plain”}，{“key”：“.hqx”，“value”：“application/mac-binhex40”}，{“key”：“.hta”，“value”：“application/hta”} , {"key": ".htc", "value": "text/x-component"}, {"key": ".htm", "value": "text/html"}, {"key": ".html", "value": "text/html"}, {"key": ".htt", "value": "text/webviewhtml"}, {"key": ".hxa", "value" : "application/xml"}, {"key": ".hxc", "value": "application/xml"}, {"key": ".hxd", "value": "application/octet-stream" }，{“key”：“.hxe”，“value”：“application/xml”}，{“key”：“.hxf”，“value”：“application/xml”}，{“key”：“ .hxh", "value": "application/octet-stream"}, {"key": ".hxi", "value": "application/octet-stream"}, {"key": ".hxk", “值”：“应用程序/xml”}，{“ke y": ".hxq", "value": "application/octet-stream"}, {"key": ".hxr", "value": "application/octet-stream"}, {"key": " .hxs", "value": "application/octet-stream"}, {"key": ".hxt", "value": "text/html"}, {"key": ".hxv", "value ": "application/xml"}, {"key": ".hxw", "value": "application/octet-stream"}, {"key": ".hxx", "value": "text/plain "}, {"key": ".i", "value": "text/plain"}, {"key": ".ico", "value": "image/x-icon"}, {"key ": ".ics", "value": "application/octet-stream"}, {"key": ".idl", "value": "text/plain"}, {"key": ".ief" , "value": "image/ief"}, {"key": ".iii", "value": "application/x-iphone"}, {"key": ".inc", "value": " text/plain"}, {"key": ".inf", "value": "application/octet-stream"}, {"key": ".inl", "value": "text/plain"}, {“key”：“.ins”，“value”：“application/x-internet-signup”}，{“key”：“.ipa”，“value”：“application/x-itunes-ipa”}， {“key”：“.ipg”，“value”：“application/x-itunes-ipg”}，{“key”：“.ipproj”，“value”：“text/plain”}，{“key” ：“.ipsw”，“值”：“应用程序/x-itunes-ipsw”}，{ “key”：“.iqy”，“value”：“text/x-ms-iqy”}，{“key”：“.isp”，“value”：“application/x-internet-signup”}，{ “key”：“.ite”，“value”：“application/x-itunes-ite”}，{“key”：“.itlp”，“value”：“application/x-itunes-itlp”}，{ “key”：“.itms”，“value”：“application/x-itunes-itms”}，{“key”：“.itpc”，“value”：“application/x-itunes-itpc”}，{ “key”：“.IVF”，“value”：“video/x-ivf”}，{“key”：“.jar”，“value”：“application/java-archive”}，{“key”： ".java", "value": "application/octet-stream"}, {"key": ".jck", "value": "application/liquidmotion"}, {"key": ".jcz", "值”：“应用程序/liquidmotion”}，{“键”：“.jfif”，“值”：“图像/pjpeg”}，{“键”：“.jnlp”，“值”：“应用程序/x- java-jnlp-file"}, {"key": ".jpb", "value": "application/octet-stream"}, {"key": ".jpe", "value": "image/jpeg" }，{“key”：“.jpeg”，“value”：“image/jpeg”}，{“key”：“.jpg”，“value”：“image/jpeg”}，{“key”：“ .js", "value": "application/x-javascript"}, {"key": ".json", "value": "application/json"}, {"key": ".jsx", "value ": "文本/jscript"}, { “key”：“.jsxbin”，“value”：“text/plain”}，{“key”：“.latex”，“value”：“application/x-latex”}，{“key”：“。 library-ms", "value": "application/windows-library+xml"}, {"key": ".lit", "value": "application/x-ms-reader"}, {"key": ".loadtest", "value": "application/xml"}, {"key": ".lpk", "value": "application/octet-stream"}, {"key": ".lsf", " value": "video/x-la-asf"}, {"key": ".lst", "value": "text/plain"}, {"key": ".lsx", "value": " video/x-la-asf"}, {"key": ".lzh", "value": "application/octet-stream"}, {"key": ".m13", "value": "application/ x-msmediaview"}, {"key": ".m14", "value": "application/x-msmediaview"}, {"key": ".m1v", "value": "video/mpeg"}, {“key”：“.m2t”，“value”：“video/vnd.dlna.mpeg-tts”}，{“key”：“.m2ts”，“value”：“video/vnd.dlna.mpeg- tts"}, {"key": ".m2v", "value": "video/mpeg"}, {"key": ".m3u", "value": "audio/x-mpegurl"}, {"键”：“.m3u8”，“值”：“音频/x-mpegurl”}，{“键”：“.m4a”，“值”：“音频/m4a”}，{“键”：“.m4b ", "value": "audio/m4b"}, {"key": ".m4p", "value": "audio/m4 p"}, {"key": ".m4r", "value": "audio/x-m4r"}, {"key": ".m4v", "value": "video/x-m4v"}, {“key”：“.mac”，“value”：“image/x-macpaint”}，{“key”：“.mak”，“value”：“text/plain”}，{“key”：“ .man", "value": "application/x-troff-man"}, {"key": ".manifest", "value": "application/x-ms-manifest"}, {"key": " .map", "value": "text/plain"}, {"key": ".master", "value": "application/xml"}, {"key": ".mda", "value": “application/msaccess”}，{“key”：“.mdb”，“value”：“application/x-msaccess”}，{“key”：“.mde”，“value”：“application/msaccess”} , {"key": ".mdp", "value": "application/octet-stream"}, {"key": ".me", "value": "application/x-troff-me"}, { “key”：“.mfp”，“value”：“application/x-shockwave-flash”}，{“key”：“.mht”，“value”：“message/rfc822”}，{“key”： ".mhtml", "value": "message/rfc822"}, {"key": ".mid", "value": "audio/mid"}, {"key": ".midi", "value" : "audio/mid"}, {"key": ".mix", "value": "application/octet-stream"}, {"key": ".mk", "value": "text/plain" }, {"key": ".mmf", "value": "application/x-smaf"}, {“key”：“.mno”，“value”：“text/xml”}，{“key”：“.mny”，“value”：“application/x-msmoney”}，{“key”：“ .mod", "value": "video/mpeg"}, {"key": ".mov", "value": "video/quicktime"}, {"key": ".movie", "value": "video/x-sgi-movie"}, {"key": ".mp2", "value": "video/mpeg"}, {"key": ".mp2v", "value": "video/mpeg "}, {"key": ".mp3", "value": "audio/mpeg"}, {"key": ".mp4", "value": "video/mp4"}, {"key": ".mp4v", "value": "video/mp4"}, {"key": ".mpa", "value": "video/mpeg"}, {"key": ".mpe", "value" ：“video/mpeg”}，{“key”：“.mpeg”，“value”：“video/mpeg”}，{“key”：“.mpf”，“value”：“application/vnd.ms- mediapackage"}, {"key": ".mpg", "value": "video/mpeg"}, {"key": ".mpp", "value": "application/vnd.ms-project"}, {"key": ".mpv2", "value": "video/mpeg"}, {"key": ".mqv", "value": "video/quicktime"}, {"key": ".ms ", "value": "application/x-troff-ms"}, {"key": ".msi", "value": "application/octet-stream"}, {"key": ".mso", "value": "application/octet-stream"}, {"key": ".mts", "value": "video/vnd.dlna.mpeg-tts"}, { “key”：“.mtx”，“value”：“application/xml”}，{“key”：“.mvb”，“value”：“application/x-msmediaview”}，{“key”：“。 mvc", "value": "application/x-miva-compiled"}, {"key": ".mxp", "value": "application/x-mmxp"}, {"key": ".nc" , "value": "application/x-netcdf"}, {"key": ".nsc", "value": "video/x-ms-asf"}, {"key": ".nws", " value": "message/rfc822"}, {"key": ".ocx", "value": "application/octet-stream"}, {"key": ".oda", "value": "application/ oda"}, {"key": ".odc", "value": "text/x-ms-odc"}, {"key": ".odh", "value": "text/plain"}, {"key": ".odl", "value": "text/plain"}, {"key": ".odp", "value": "application/vnd.oasis.opendocument.presentation"}, {"键”：“.ods”，“值”：“应用程序/oleobject”}，{“键”：“.odt”，“值”：“应用程序/vnd.oasis.opendocument.text”}，{“键” : ".webtest", "value": "application/xml"}, {"key": ".wiq", "value": "application/xml"}, {"key": ".wiz", "value ": "application/msword"}, {"key": ".wks", "value": "application/vnd.ms-works"}, {"key": ".WLMP", "value": "application /wlmov iemaker"}，{"key"：".wlpginstall"，"value"："application/x-wlpg-detect"}，{"key"：".wlpginstall3"，"value"："application/x-wlpg3-检测”}，{“key”：“.wm”，“value”：“video/x-ms-wm”}，{“key”：“.wma”，“value”：“audio/x-ms- wma"}, {"key": ".wmd", "value": "application/x-ms-wmd"}, {"key": ".wmf", "value": "application/x-msmetafile" }，{“key”：“.wml”，“value”：“text/vnd.wap.wml”}，{“key”：“.wmlc”，“value”：“application/vnd.wap.wmlc” }，{“key”：“.wmls”，“value”：“text/vnd.wap.wmlscript”}，{“key”：“.wmlsc”，“value”：“application/vnd.wap.wmlscriptc” }, {"key": ".wmp", "value": "video/x-ms-wmp"}, {"key": ".wmv", "value": "video/x-ms-wmv" }, {"key": ".wmx", "value": "video/x-ms-wmx"}, {"key": ".wmz", "value": "application/x-ms-wmz" }，{“key”：“.wpl”，“value”：“application/vnd.ms-wpl”}，{“key”：“.wps”，“value”：“application/vnd.ms-works” }，{“key”：“.wri”，“value”：“application/x-mswrite”}，{“key”：“.wrl”，“value”：“x-world/x-vrml”}， {“key”：“.wrz”，“value”：“x-world/x-vrml”}，{“key”：“.wsc”，“value”：“te xt/scriptlet"}, {"key": ".wsdl", "value": "text/xml"}, {"key": ".wvx", "value": "video/x-ms-wvx" }, {"key": ".x", "value": "application/directx"}, {"key": ".xaf", "value": "x-world/x-vrml"}, {"键”：“.xaml”，“值”：“应用程序/xaml+xml”}，{“键”：“.xap”，“值”：“应用程序/x-silverlight-app”}，{“键” ：“.xbap”，“值”：“应用程序/x-ms-xbap”}，{“键”：“.xbm”，“值”：“图像/x-xbitmap”}，{“键”：“ .xdr", "value": "text/plain"}, {"key": ".xht", "value": "application/xhtml+xml"}, {"key": ".xhtml", "value ": "application/xhtml+xml"}, {"key": ".xla", "value": "application/vnd.ms-excel"}, {"key": ".xlam", "value": "application/vnd.ms-excel.addin.macroEnabled.12"}, {"key": ".xlc", "value": "application/vnd.ms-excel"}, {"key": ".xld ", "value": "application/vnd.ms-excel"}, {"key": ".xlk", "value": "application/vnd.ms-excel"}, {"key": ".xll ", "value": "application/vnd.ms-excel"}, {"key": ".xlm", "value": "application/vnd.ms-excel"}, {"key": ".xls ", "值": "application/vnd.ms-excel"}, {"ke y": ".xlsb", "value": "application/vnd.ms-excel.sheet.binary.macroEnabled.12"}, {"key": ".xlsm", "value": "application/vnd. ms-excel.sheet.macroEnabled.12"}, {"key": ".xlsx", "value": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"}, {"key": ".xlt" ，“值”：“应用程序/vnd.ms-excel”}，{“键”：“.xltm”，“值”：“应用程序/vnd.ms-excel.template.macroEnabled.12”}，{“键": ".xltx", "value": "application/vnd.openxmlformats-officedocument.spreadsheetml.template"}, {"key": ".xlw", "value": "application/vnd.ms-excel"} ，{“key”：“.xml”，“value”：“text/xml”}，{“key”：“.xmta”，“value”：“application/xml”}，{“key”：“。 xof", "value": "x-world/x-vrml"}, {"key": ".XOML", "value": "text/plain"}, {"key": ".xpm", "值”：“图像/x-xpixmap”}，{“键”：“.xps”，“值”：“应用程序/vnd.ms-xpsdocument”}，{“键”：“.xrm-ms”，“值”：“文本/xml”}，{“键”：“.xsc”，“值”：“应用程序/xml”}，{“键”：“.xsd”，“值”：“文本/xml” }，{“key”：“.xsf”，“value”：“text/xml”}，{“key”：“.xsl”，“value”： “text/xml”}，{“key”：“.xslt”，“value”：“text/xml”}，{“key”：“.xsn”，“value”：“application/octet-stream”} , {"key": ".xss", "value": "application/xml"}, {"key": ".xtp", "value": "application/octet-stream"}, {"key": ".xwd", "value": "image/x-xwindowdump"}, {"key": ".z", "value": "application/x-compress"}, {"key": ".zip" , "value": "application/x-zip-compressed"} ] let index = myList.map((o) => o.key).indexOf(ext);让 mime = myList[index]["value"];返回 mime }
MimeType:
当然，为了将共同的完整性、动态性和可移植性的优势与最小的依赖相结合
您将 Samuel Neff 的静态字典与特定于平台的查询（例如 Bryan Denny 的查询）结合起来。
例如，在 Linux 命令行工具“xdg-mime”下可能会做后面的部分。
FileExtension 处理文件扩展名而不是 Mime。用户可以更改文件扩展名，因此请检查 Mime。代码示例通过文件扩展名关联 Mime，这是错误的并且不起作用。
需要获取contenttype文件并根据文件扩展名检查表是否Mime contetType这个文件。现在，如何获取文件的ContentType？
因此，使用 FileUpload 是：FileUpload.PostedFile.ContentType; 现在，如果我已经拥有该文件，是否捕获了您的 ContentType？
您可以使用 MimeMappings 类。我认为这是最简单的方法。我也导入了 MimeMappings。因为我觉得找到这些类的导入很麻烦。
import org.springframework.boot.web.server.MimeMappings;
MimeMappings mm=new MimeMappings();
String mimetype = mm.get(fileExtension);
System.out.println(mimetype);
.docx和.xlsx以及其他重要的网络扩展，例如.csv、.swf和.air。MimeMapping._mappingDictionary.AddMapping(string fileExtension, string mimeType)) 添加映射。