Handle WM_CLOSE message send to C# Tray App

Question

I found a couple of articles telling me how to make use of the WM_CLOSE message but never the less my application is the one who has to handle the WM_CLOSE message.

Is there a way to hook up the WM_CLOSE and handle it? Because the WM_CLOSE only closes the tray icon but does not terminate the process itself ...

Regards,

Answer 1

We can deal with WM_CLOSE message by adding a MessageFilter to Application:

private class CloseMessageFilter : IMessageFilter
{
    const int WM_CLOSE = 0x0010;
    
    public bool PreFilterMessage(ref Message m)
    {
        if (m.Msg == WM_CLOSE)
            Application.Exit();

        return false;
    }
}

static void Main()
{
    // ...
    Application.AddMessageFilter(new CloseMessageFilter());
    Application.Run();
}

Tested under .NET 6 only.