static void Main()
{
// Add event handlers to Show event.
_show += new Program.EventHandler(Cat);
_show += new Program.EventHandler(Dog);
_show += new Program.EventHandler(Mouse);
_show += new Program.EventHandler(Mouse);
// Invoke the event.
//d1.Invoke();
//if (_show != null) {
// _show();
//}
_show?.Invoke();
}
private static extern bool SetConsoleCtrlHandler(Program.EventHandler handler, bool add);