C#Win32控制臺應用程序忽略Ctrl+C，阻止程序退出

2019-11-14 16:13:58

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C# Win32控制臺應用程序忽略 Ctrl + C，阻止程序退出，這里使用到了Windows API SetConsoleCtrlHandler函數

注意：在VS中調試執行時，在處理程序例程中設置斷點，不會中斷；會提示：無可用源，如下圖：

完整示例代碼：

using System;
using System.Collections.Generic;
using System.Text;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Threading;
 
/************************************************************************/
/* CSharp_Win32控制臺應用程序忽略 Ctrl + C
 * Powered by:testcs_dn
 * Blog:http://blog.csdn.net/testcs_dn
 */
/************************************************************************/
namespace CSharp_Win32控制臺應用程序忽略CtrlC
{
    //定義處理程序委托
    public delegate bool ConsoleCtrlDelegate(int ctrlType);
 
    class PRogram
    {
        //導入SetCtrlHandlerHandler API
        [DllImport("kernel32.dll")]
        private static extern bool SetConsoleCtrlHandler(ConsoleCtrlDelegate HandlerRoutine, bool Add);
        //當用戶關閉Console時，系統會發送次消息
        private const int CTRL_CLOSE_EVENT = 2;
        //Ctrl+C，系統會發送次消息
        private const int CTRL_C_EVENT = 0;
        //Ctrl+break，系統會發送次消息
        private const int CTRL_BREAK_EVENT = 1;
        //用戶退出（注銷），系統會發送次消息
        private const int CTRL_LOGOFF_EVENT = 5;
        //系統關閉，系統會發送次消息
        private const int CTRL_SHUTDOWN_EVENT = 6;
 
        static void Main(string[] args)
        {
            Program cls = new Program();
            //Console.ReadKey();
        }
        public Program()
        {
            ConsoleCtrlDelegate consoleDelegete = new ConsoleCtrlDelegate(HandlerRoutine);
 
            bool bRet = SetConsoleCtrlHandler(consoleDelegete, true);
            if (bRet == false) //安裝事件處理失敗
            {
                Console.WriteLine("error");
                while (true)
                {
                    Console.WriteLine("...");
                    Thread.Sleep(1000);
                }
            }
            else
            {
                Console.WriteLine("ok");
                while (true)
                {
                    Console.WriteLine("...");
                    Thread.Sleep(1000);
                }
            }
 
        }
 
        /// <summary>
        /// 處理程序例程，在這里編寫對指定事件的處理程序代碼
        /// 注意：在VS中調試執行時，在這里設置斷點，但不會中斷；會提示：無可用源；
        /// </summary>
        ///<param name="CtrlType">
        /// <returns></returns>
        private static bool HandlerRoutine(int ctrlType)
        {
            switch(ctrlType)
            {
                case CTRL_C_EVENT:
                    Console.WriteLine("C");
                    return true; //這里返回true，表示阻止響應系統對該程序的操作
                    //break;
                case CTRL_BREAK_EVENT:
                    Console.WriteLine("BREAK");
                    break;
                case CTRL_CLOSE_EVENT:
                    Console.WriteLine("CLOSE");
                    break;
                case CTRL_LOGOFF_EVENT:
                    Console.WriteLine("LOGOFF");
                    break;
                case CTRL_SHUTDOWN_EVENT:
                    Console.WriteLine("SHUTDOWN");
                    break;
            }
            //return true;//表示阻止響應系統對該程序的操作
            return false;//忽略處理，讓系統進行默認操作
        }
    }
}