I am trying to figure out whether a specific callback interface can be
implemented in .net.  I have done implementations for a number of
interfaces, but this one isn't cooperating.  My guess is that the problem is
due to this line from the method's docs:

This method uses the thiscall calling convention, rather than __stdcall.

The complete docs for the method are here:

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/directshow/htm/
iamfiltergraphcallbackunabletorender.asp

I have seen the CallingConvention enum, but it only seems to apply to
DllImport, not COM interfaces or their methods.  Is there any way to
convince .NET to use thiscall when making the callback to this method?