c#_dll_expose_to_COM_interface.txt

// COM Data Types:
// https://docs.microsoft.com/en-us/previous-versions/visualstudio/visual-studio-2008/sak564ww(v=vs.90)

using System.Runtime.InteropServices;

namespace COMDLL 
{
    [Guid("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")]
    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IMyclass
    {
        [DispId(1)]
        int Add(int i, int j);
    }

    [Guid("yyyyyyyy-yyyy-yyyy-yyyy-yyyyyyyyyyyy")]
    [ComVisible(true)]
    [ClassInterface(ClassInterfaceType.None)]
    [ProgId("COMDLL.Myclass")]
    public class Myclass : IMyclass
    {
        public int Add(int i, int j)
        {
            return i + j;
        }
    }
}