ArgumentException: "Cannot create an instance of TEnum because Type.ContainsGenericParameters is true" caused by Enum constraint on method out parameter
#656
Comments
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I should also have pointed out that this throws the same exception: var proxy = new Castle.DynamicProxy.ProxyGenerator().CreateInterfaceProxyWithoutTarget(typeof(ITestInterface1));So I'm guessing this is a DynamicProxy issue -- either that or both Moq and I are calling the wrong method. |
abagonhishead
changed the title
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This also affects classes: using System;
using Moq;
public class Program
{
public static void Main()
{
var mock1 = new Mock<TestClass1>();
var mock2 = new Mock<TestClass2>();
// Throws
var instance1 = mock1.Object;
// Does not throw
var instance2 = mock2.Object;
}
public class TestClass1
{
public virtual bool TestMethod<TEnum>(out TEnum? someValue)
where TEnum : Enum
{
someValue = default(TEnum?);
return false;
}
}
public class TestClass2
{
public virtual bool TestMethod<TEnum>(out TEnum? someValue)
{
someValue = default(TEnum?);
return false;
}
}
}Stack trace: |
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@abagonhishead, thanks for reporting, I'm going to take a look at it. |
stakx
changed the title
Enum constraint on method out parameter causes ArgumentException
|
This is apparently caused by type checks inside |
stakx
changed the title
Enum constraint on method out parameter causes ArgumentExceptionArgumentException : "Cannot create an instance of TEnum because Type.ContainsGenericParameters is true" caused by Enum constraint on method out parameter
stakx
changed the title
ArgumentException : "Cannot create an instance of TEnum because Type.ContainsGenericParameters is true" caused by Enum constraint on method out parameterArgumentException: "Cannot create an instance of TEnum because Type.ContainsGenericParameters is true" caused by Enum constraint on method out parameter
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Hi there,
I encountered this using Moq but, from what I could see in the stack trace, it appears to be an issue with Castle.DynamicProxy. Hopefully raising this here is the correct thing to do.
Let me know if I'm wrong and I can raise it with them instead!
I'm not familiar with DynamicProxy so hopefully it's easy enough to suss out.
This is on .NET 6, Moq version 4.20.69 which is using Castle.Core 5.1.1
Example reproduction using Moq on dotnetfiddle
Exception:
Stack trace:
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