using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading;

namespace ConsoleApplication3
{
    class Program
    {
        public delegate bool HandlerRoutine(CtrlTypes CtrlType);
        public enum CtrlTypes
        {
            CTRL_C_EVENT = 0,
            CTRL_BREAK_EVENT =1,
            CTRL_CLOSE_EVENT =2,
            CTRL_LOGOFF_EVENT = 5,
            CTRL_SHUTDOWN_EVENT =6
        }

        [DllImport("Kernel32", SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool SetConsoleCtrlHandler(
            [In]
            [Optional]
            [MarshalAs(UnmanagedType.FunctionPtr)]
            HandlerRoutine Handler,
            [In]
            [MarshalAs(UnmanagedType.Bool)]
            bool Add
          );


        private static bool ConsoleCtrlCheck(CtrlTypes ctrlType)
        {
            switch (ctrlType)
            {
                case CtrlTypes.CTRL_C_EVENT:
                case CtrlTypes.CTRL_BREAK_EVENT:
                    return false;
                case CtrlTypes.CTRL_CLOSE_EVENT:
                case CtrlTypes.CTRL_LOGOFF_EVENT:
                case CtrlTypes.CTRL_SHUTDOWN_EVENT:
                    onClose(ctrlType);
                    return true;
                default:
                    return false;
            }
        }

        private static void onClose(CtrlTypes ctrlType)
        {
            Console.WriteLine("CLOSE: {0}", ctrlType);
        }

        static void Main(string[] args)
        {
            Console.WriteLine("START.");
            Console.CancelKeyPress +=  Console_CancelKeyPress;
            SetConsoleCtrlHandler(ConsoleCtrlCheck, true);
            while (true)
                Thread.Sleep(100);
        }

        static void Console_CancelKeyPress(object sender, ConsoleCancelEventArgs e)
        {
            e.Cancel = true;
            Console.WriteLine("SIGNAL: {0}", e.SpecialKey);
        }
    }
}