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TypeLoadException: Type 'generatedProxy_5' from assembly 'ProxyBuilder, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' is attempting to implement an inaccessible interface.

A colleague shared with me the following strange error message he got when he tried to use a .NET Standard library I created:

An unhandled exception occurred while processing the request.

TypeLoadException: Type 'generatedProxy_5' from assembly 'ProxyBuilder, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' is attempting to implement an inaccessible interface.

System.Reflection.Emit.TypeBuilder.CreateTypeNoLock()

· TypeLoadException: Type 'generatedProxy_5' from assembly 'ProxyBuilder, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' is attempting to implement an inaccessible interface.

o System.Reflection.Emit.TypeBuilder.CreateTypeNoLock()

o System.Reflection.Emit.TypeBuilder.CreateTypeInfo()

o System.Reflection.DispatchProxyGenerator+ProxyBuilder.CreateType()

o System.Reflection.DispatchProxyGenerator.GenerateProxyType(Type baseType, Type interfaceType)

o System.Reflection.DispatchProxyGenerator.GetProxyType(Type baseType, Type interfaceType)

o System.Reflection.DispatchProxyGenerator.CreateProxyInstance(Type baseType, Type interfaceType)

o System.Reflection.DispatchProxy.Create<T, TProxy>()

o System.ServiceModel.Channels.ServiceChannelProxy.CreateProxy<TChannel>(MessageDirection direction, ServiceChannel serviceChannel)

o System.ServiceModel.Channels.ServiceChannelFactory.CreateProxy<TChannel>(MessageDirection direction, ServiceChannel serviceChannel)

o System.ServiceModel.Channels.ServiceChannelFactory.CreateChannel<TChannel>(EndpointAddress address, Uri via)

o System.ServiceModel.ChannelFactory<TChannel>.CreateChannel(EndpointAddress address, Uri via)

o System.ServiceModel.ChannelFactory<TChannel>.CreateChannel()

o System.ServiceModel.ClientBase<TChannel>.CreateChannel()

o System.ServiceModel.ClientBase<TChannel>.CreateChannelInternal()

o System.ServiceModel.ClientBase<TChannel>.get_Channel()

o IRD3Service.IRD3ServiceClient.MbCoreGetIdentificerendeEenheidAsync(int idIe) in Reference.cs

Inside this library I’m doing a WCF call to get some data from a backend service. WCF internally generates a proxy for the WCF client through the ProxyBuilder and it is this ProxyBuilder that started to complain…

The problem seems to be that I generated all my proxy types as internal(which should be a good thing). But the ProxyBuilder does not agree with me.

Some research (thanks Google!) brought me to the following possible solutions:

  • Change all proxy types from internal to public
  • Add an InternalsVisibleToAttribute(“ProxyBuilder”) to the library

I tried the second approach and it worked! Up to the next problem…

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