An expression tree may not contain a call or invocation that uses optional arguments
An expression tree may not contain a call or invocation that uses optional arguments
return this.RedirectToAction<MerchantController>(x => x.Edit(merchantId));
Where edit had a second, nullable argument.
Why is this?
Had the same message when trying to use Mock.setup to mock a method with multiple default parameters. I just had to add the additional parameters in the lambda.
void someMethod(string arg1 = "", string arg2 = "")
mockedObject.Setup(x => x.someMethod(It.IsAny<string>(), It.IsAny<string>()))
The underlying expression tree API does not support optional arguments.
For IL-compiled code the C# compiler inserts the default values at compile time (hard-coded), because the CLR does not support calling methods with optional arguments either when the arguments are not provided explicitly.
Error: 'an exception tree may not contain a call or invocation that uses option arguments'
Why: Because you are not providing the optional parameters when calling the method. Mainly you get this with .net core when using IAsyncProxy service object.
Fix: Pass all the optional parameters value, you may use default value if you.
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x.someMethod(default,default)... can be used.