TypeLoadException while mocking mixed code interface that contains a method with 'const char' parameter.

[mvdtom]

There is an interface written in c++/cli:

public interface class IFoo
{
    virtual bool DoWork(const char type);
};

When I mock it:

var mocked = Mock.Of<IFoo>();

It throws the following exception:

System.TypeLoadException was unhandled by user code
  HResult=-2146233054
  Message=Signature of the body and declaration in a method implementation do not match.  Type: 'Castle.Proxies.IFooProxy'.  Assembly: 'DynamicProxyGenAssembly2, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null'.
  Source=mscorlib
  TypeName=Castle.Proxies.IFooProxy
  StackTrace:
       at System.Reflection.Emit.TypeBuilder.TermCreateClass(RuntimeModule module, Int32 tk, ObjectHandleOnStack type)
       at System.Reflection.Emit.TypeBuilder.CreateTypeNoLock()
       at System.Reflection.Emit.TypeBuilder.CreateType()
       at Castle.DynamicProxy.Generators.Emitters.AbstractTypeEmitter.CreateType(TypeBuilder type)
       at Castle.DynamicProxy.Generators.Emitters.AbstractTypeEmitter.BuildType()
       at Castle.DynamicProxy.Generators.InterfaceProxyWithoutTargetGenerator.GenerateType(String typeName, Type proxyTargetType, Type[] interfaces, INamingScope namingScope)
       at Castle.DynamicProxy.Generators.InterfaceProxyWithTargetGenerator.<>c__DisplayClass1.<GenerateCode>b__0(String n, INamingScope s)
       at Castle.DynamicProxy.Generators.BaseProxyGenerator.ObtainProxyType(CacheKey cacheKey, Func`3 factory)
       at Castle.DynamicProxy.Generators.InterfaceProxyWithTargetGenerator.GenerateCode(Type proxyTargetType, Type[] interfaces, ProxyGenerationOptions options)
       at Castle.DynamicProxy.DefaultProxyBuilder.CreateInterfaceProxyTypeWithoutTarget(Type interfaceToProxy, Type[] additionalInterfacesToProxy, ProxyGenerationOptions options)
       at Castle.DynamicProxy.ProxyGenerator.CreateInterfaceProxyWithoutTarget(Type interfaceToProxy, Type[] additionalInterfacesToProxy, ProxyGenerationOptions options, IInterceptor[] interceptors)
       at Moq.Proxy.CastleProxyFactory.CreateProxy(Type mockType, ICallInterceptor interceptor, Type[] interfaces, Object[] arguments)
       at Moq.Mock`1.<InitializeInstance>b__2()
       at Moq.PexProtector.Invoke(Action action)
       at Moq.Mock`1.InitializeInstance()
       at Moq.Mock`1.OnGetObject()
       at Moq.Mock`1.get_Object()
       at Moq.Mocks.<CreateMocks>d__0`1.MoveNext()
       at System.Linq.Enumerable.First[TSource](IEnumerable`1 source)
       at lambda_method(Closure )
       at System.Linq.EnumerableExecutor`1.Execute()
       at System.Linq.EnumerableQuery`1.System.Linq.IQueryProvider.Execute[S](Expression expression)
       at System.Linq.Queryable.First[TSource](IQueryable`1 source)
       at lambda_method(Closure )
       at Moq.Linq.MockQueryable`1.Execute[TResult](Expression expression)
       at System.Linq.Queryable.First[TSource](IQueryable`1 source)
       at Moq.Mock.Of[T]()
       at MoqTest.Class1.Test() in c:\users\mvdto_000\documents\visual studio 2015\Projects\MoqTest\MoqTest\Class1.cs:line 20
  InnerException: 

It occurs only with const modifier and only with char. It works fine without const as well as with another type (e.g. int).

[stakx]

@mvdtom, thanks for the report. This is an issue with Castle DynamicProxy, so I have forwarded your report to the Castle Core project (see castleproject/Core#277) with some added details.

[stakx]

A fix for this has just been merged into Castle.Core (see castleproject/Core#278), so this issue will be resolved as soon as we update Moq to DynamicProxy >4.1.0.

[stakx]

This has been taken care of in Castle.Core, so there's nothing left to do here other than wait for the next release of that dependency. This is being tracked by #402.