C DLL to C#

[alank2]

I've build a DLL using C++ and it has this function:

extern "C" __declspec(dllexport) CConfiguration* CFGCreateObject()

I've got it working in C# by using:

[DllImport("cfgfile.dll", CallingConvention = CallingConvention.Cdecl)] public static extern int _CFGCreateObject();

My question is WHY do I have to put in the underscore before it?

 

[JohnH]

While I must emphasize this is a C# forum, the answer is in the C++ export, look here Decorated Names | Microsoft Docs
See also dllexport, dllimport | Microsoft Docs ("To export an undecorated name...")

 

[alank2]

Thanks John.