How to export C# methods?

Question

How can we export C# methods?

I have a dll and I want to use its methods in the Python language with the ctypes module. Because I need to use the ctypes module, I ne

Answer 1

That's not possible. If you need DLL exports you'll need to use the C++/CLI language. For example:

public ref class Class1 {
public:
  static int add(int a, int b) {
      return a + b;
  }
};

extern "C" __declspec(dllexport) 
int add(int a, int b) {
  return Class1::add(a, b);
}

The class can be written in C# as well. The C++/CLI compiler emits a special thunk for the export that ensures that the CLR is loaded and execution switches to managed mode. This is not exactly fast.

Writing [ComVisible(true)] code in C# is another possibility.