Writing a DLL in C/C++ for .Net interoperability

Question

In my C# application, I would like to write a part of the code in C. I plan to write a DLL witch would be interoperable with .Net. How can I do that?

Answer 1

Below is an example for an application where I had to do just that. In my case, I needed a DLL to wrap calls to functions that were only available in a .lib. The key part is the extern "C" __declspec (dllexport) in the declaration. That's basically all you need. The rest was merely using dllimport in the C# app and getting the marshalling right.

extern "C" __declspec (dllexport) LONG EstablishContext(DWORD dwScope, 
                                                    LPCVOID pvReserved1, 
                                                    LPCVOID pvReserved2, 
                                                    LPSCARDCONTEXT phContext)
{
    return SCardEstablishContext(dwScope, pvReserved1, pvReserved2, phContext);
}