Question

I’m writing a C++ DLL that needs to notify client applications. In C++ (MFC), I can register a client window handle inside the DLL, then call PostMessage when I need to notify the client about something. What can I do when the client is a C# application?

Answer 1

You can override the WndProc method in the C# window to handle this specific message

protected override void WndProc(ref Message m)
{
    if (m.Msg = YOUR_MESSAGE)
    {
        // handle the notification
    }
    else
    {
        base.WndProc(ref m);
    }
}