Got a question yesterday how to get an event when a user clicks the close button in a console app. This code snippet is what I have used.

class Application
{
    static Application()
    {
        SetConsoleCtrlHandler(Handler, true);
    }

    public static event Action Close;

    public static event Action Break;

    public static event Action CtrlC;

    public static event Action LogOff;

    public static event Action Shutdown;

    [DllImport("Kernel32")]
    private static extern bool SetConsoleCtrlHandler(HandlerRoutine handler, bool add);

    private delegate bool HandlerRoutine(CtrlTypes CtrlType);

    private enum CtrlTypes
    {
        CTRL_C_EVENT = 0,
        CTRL_BREAK_EVENT,
        CTRL_CLOSE_EVENT,
        CTRL_LOGOFF_EVENT = 5,
        CTRL_SHUTDOWN_EVENT
    }

    private static bool Handler(CtrlTypes ctrlType)
    {
        switch (ctrlType)
        {
            case CtrlTypes.CTRL_C_EVENT:
                if (CtrlC != null)
                    CtrlC();
                break;
            case CtrlTypes.CTRL_BREAK_EVENT:
                if (Break != null)
                    Break();
                break;
            case CtrlTypes.CTRL_CLOSE_EVENT:
                if (Close != null)
                    Close();
                break;
            case CtrlTypes.CTRL_LOGOFF_EVENT:
                if (LogOff != null)
                    LogOff();
                break;
            case CtrlTypes.CTRL_SHUTDOWN_EVENT:
                if (Shutdown != null)
                    Shutdown();
                break;
            default:
                throw new ArgumentOutOfRangeException("ctrlType");
        }
        return true;
    }
}

And it’s used as follows.

static void Main()
{
    Application.Close += () =>
    {
        Debugger.Break();
    };

    Console.ReadKey();
}