ASP.NET MVC View Engine Comparison
I've been searching on SO & Google for a breakdown of the various View Engines available for ASP.NET MVC, but haven't found much more than simple high-level descriptions of what a view engine is.
I'm not necessarily looking for "best" or "fastest" but rather some real world comparisons of advantages / disadvantages of the major players (e.g. the default WebFormViewEngine, MvcContrib View Engines, etc.) for various situations. I think this would be really helpful in determining if switching from the default engine would be advantageous for a given project or development group.
Has anyone encountered such a comparison?
ASP.NET MVC View Engines (Community Wiki)
Since a comprehensive list does not appear to exist, let's start one here on SO. This can be of great value to the ASP.NET MVC community if people add their experience (esp. anyone who contributed to one of these). Anything implementing IViewEngine (e.g. VirtualPathProviderViewEngine) is fair game here. Just alphabetize new View Engines (leaving WebFormViewEngine and Razor at the top), and try to be objective in comparisons.
System.Web.Mvc.WebFormViewEngine
Design Goals:
A view engine that is used to render a Web Forms page to the response.
Pros:
ubiquitous since it ships with ASP.NET MVC
familiar experience for ASP.NET developers
IntelliSense
can choose any language with a CodeDom provider (e.g. C#, VB.NET, F#, Boo, Nemerle)
on-demand compilation or precompiled views
Cons:
usage is confused by existence of "classic ASP.NET" patterns which no longer apply in MVC (e.g. ViewState PostBack)
can contribute to anti-pattern of "tag soup"
code-block syntax and strong-typing can get in the way
IntelliSense enforces style not always appropriate for inline code blocks
can be noisy when designing simple templates
Example:
<%@ Control Inherits="System.Web.Mvc.ViewPage<IEnumerable<Product>>" %>
<% if(model.Any()) { %>
<ul>
<% foreach(var p in model){%>
<li><%=p.Name%></li>
<%}%>
</ul>
<%}else{%>
<p>No products available</p>
<%}%>
Design Goals:
Pros:
Compact, Expressive, and Fluid
Easy to Learn
Is not a new language
Has great Intellisense
Unit Testable
Ubiquitous, ships with ASP.NET MVC
Cons:
Creates a slightly different problem from "tag soup" referenced above. Where the server tags actually provide structure around server and non-server code, Razor confuses HTML and server code, making pure HTML or JS development challenging (see Con Example #1) as you end up having to "escape" HTML and / or JavaScript tags under certain very common conditions.
Poor encapsulation+reuseability: It's impractical to call a razor template as if it were a normal method - in practice razor can call code but not vice versa, which can encourage mixing of code and presentation.
Syntax is very html-oriented; generating non-html content can be tricky. Despite this, razor's data model is essentially just string-concatenation, so syntax and nesting errors are neither statically nor dynamically detected, though VS.NET design-time help mitigates this somewhat. Maintainability and refactorability can suffer due to this.
No documented API, http://msdn.microsoft.com/en-us/library/system.web.razor.aspx
Con Example #1 (notice the placement of "string[]..."):
@{
<h3>Team Members</h3> string[] teamMembers = {"Matt", "Joanne", "Robert"};
foreach (var person in teamMembers)
{
<p>@person</p>
}
}
Design goals:
Respect HTML as first-class language as opposed to treating it as "just text". Don't mess with my HTML! The data binding code (Bellevue code) should be separate from HTML. Enforce strict Model-View separation
Design Goals:
The Brail view engine has been ported from MonoRail to work with the Microsoft ASP.NET MVC Framework. For an introduction to Brail, see the documentation on the Castle project website.
Pros:
modeled after "wrist-friendly python syntax"
On-demand compiled views (but no precompilation available)
Cons:
designed to be written in the language Boo
Example:
<html>
<head>
<title>${title}</title>
</head>
<body>
<p>The following items are in the list:</p>
<ul><%for element in list: output "<li>${element}</li>"%></ul>
<p>I hope that you would like Brail</p>
</body>
</html>
Hasic uses VB.NET's XML literals instead of strings like most other view engines.
Pros:
Compile-time checking of valid XML
Syntax colouring
Full intellisense
Compiled views
Extensibility using regular CLR classes, functions, etc
Seamless composability and manipulation since it's regular VB.NET code
Unit testable
Cons:
Performance: Builds the whole DOM before sending it to client.
Example:
Protected Overrides Function Body() As XElement
Return _
<body>
<h1>Hello, World</h1>
</body>
End Function
Design Goals:
NDjango is an implementation of the Django Template Language on the .NET platform, using the F# language.
Pros:
NDjango release 0.9.1.0 seems to be more stable under stress than WebFormViewEngine
Django Template Editor with syntax colorization, code completion, and as-you-type diagnostics (VS2010 only)
Integrated with ASP.NET, Castle MonoRail and Bistro MVC frameworks
Design Goals:
.NET port of Rails Haml view engine. From the Haml website: Haml is a markup language that's used to cleanly and simply describe the XHTML of any web document, without the use of inline code... Haml avoids the need for explicitly coding XHTML into the template, because it is actually an abstract description of the XHTML, with some code to generate dynamic content.
Pros:
terse structure (i.e. D.R.Y.)
well indented
clear structure
C# Intellisense (for VS2008 without ReSharper)
Cons:
an abstraction from XHTML rather than leveraging familiarity of the markup
No Intellisense for VS2010
Example:
@type=IEnumerable<Product>
- if(model.Any())
%ul
- foreach (var p in model)
%li= p.Name
- else
%p No products available
NVelocityViewEngine (MvcContrib)
Design Goals:
A view engine based upon NVelocity which is a .NET port of the popular Java project Velocity.
Pros:
easy to read/write
concise view code
Cons:
limited number of helper methods available on the view
does not automatically have Visual Studio integration (IntelliSense, compile-time checking of views, or refactoring)
Example:
#foreach ($p in $viewdata.Model)
#beforeall
<ul>
#each
<li>$p.Name</li>
#afterall
</ul>
#nodata
<p>No products available</p>
#end
Design Goals:
SharpTiles is a partial port of JSTL combined with concept behind the Tiles framework (as of Mile stone 1).
Pros:
familiar to Java developers
XML-style code blocks
Cons:
...
Example:
<c:if test="${not fn:empty(Page.Tiles)}">
<p class="note">
<fmt:message key="page.tilesSupport"/>
</p>
</c:if>
Design Goals:
The idea is to allow the html to dominate the flow and the code to fit seamlessly.
Pros:
Produces more readable templates
C# Intellisense (for VS2008 without ReSharper)
SparkSense plug-in for VS2010 (works with ReSharper)
Provides a powerful Bindings feature to get rid of all code in your views and allows you to easily invent your own HTML tags
Cons:
No clear separation of template logic from literal markup (this can be mitigated by namespace prefixes)
Example:
<viewdata products="IEnumerable[[Product]]"/>
<ul if="products.Any()">
<li each="var p in products">${p.Name}</li>
</ul>
<else>
<p>No products available</p>
</else>
<Form style="background-color:olive;">
<Label For="username" />
<TextBox For="username" />
<ValidationMessage For="username" Message="Please type a valid username." />
</Form>
StringTemplate View Engine MVC
Design Goals:
Lightweight. No page classes are created. Fast. Templates are written to the Response Output stream. Cached. Templates are cached, but utilize a FileSystemWatcher to detect file changes. Dynamic. Templates can be generated on the fly in code. Flexible. Templates can be nested to any level. In line with MVC principles. Promotes separation of UI and Business Logic. All data is created ahead of time, and passed down to the template.
Pros:
familiar to StringTemplate Java developers
Cons:
simplistic template syntax can interfere with intended output (e.g. jQuery conflict)
Wing Beats is an internal DSL for creating XHTML. It is based on F# and includes an ASP.NET MVC view engine, but can also be used solely for its capability of creating XHTML.
Pros:
Compile-time checking of valid XML
Syntax colouring
Full intellisense
Compiled views
Extensibility using regular CLR classes, functions, etc
Seamless composability and manipulation since it's regular F# code
Unit testable
Cons:
You don't really write HTML but code that represents HTML in a DSL.
Design Goals:
Builds views from familiar XSLT
Pros:
widely ubiquitous
familiar template language for XML developers
XML-based
time-tested
Syntax and element nesting errors can be statically detected.
Cons:
functional language style makes flow control difficult
XSLT 2.0 is (probably?) not supported. (XSLT 1.0 is much less practical).
My current choice is Razor. It is very clean and easy to read and keeps the view pages very easy to maintain. There is also intellisense support which is really great. ALos, when used with web helpers it is really powerful too.
To provide a simple sample:
@Model namespace.model
<!Doctype html>
<html>
<head>
<title>Test Razor</title>
</head>
<body>
<ul class="mainList">
@foreach(var x in ViewData.model)
{
<li>@x.PropertyName</li>
}
</ul>
</body>
And there you have it. That is very clean and easy to read. Granted, that's a simple example but even on complex pages and forms it is still very easy to read and understand.
As for the cons? Well so far (I'm new to this) when using some of the helpers for forms there is a lack of support for adding a CSS class reference which is a little annoying.
Thanks Nathj07
I know this doesn't really answer your question, but different View Engines have different purposes. The Spark View Engine, for example, aims to rid your views of "tag soup" by trying to make everything fluent and readable.
Your best bet would be to just look at some implementations. If it looks appealing to the intent of your solution, try it out. You can mix and match view engines in MVC, so it shouldn't be an issue if you decide to not go with a specific engine.
Check this SharpDOM . This is a c# 4.0 internal dsl for generating html and also asp.net mvc view engine.
I like ndjango. It is very easy to use and very flexible. You can easily extend view functionality with custom tags and filters. I think that "greatly tied to F#" is rather advantage than disadvantage.
I think this list should also include samples of each view engine so users can get a flavour of each without having to visit every website.
Pictures say a thousand words and markup samples are like screenshots for view engines :) So here's one from my favourite Spark View Engine
<viewdata products="IEnumerable[[Product]]"/>
<ul if="products.Any()">
<li each="var p in products">${p.Name}</li>
</ul>
<else>
<p>No products available</p>
</else>
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