C # WIN32 Console application ignores the code example of CTRL + C blocker exit

The C # WIN32 console application ignores Ctrl + C and prevents the program from exiting, using the Windows API SetConsoleCtrlHandler function

Note: When debugging execution in VS, breakpoints are set in the handler routines and are not interrupted; prompt: No sources available, such as:

Complete Sample code:

Using system;using system.collections.generic;using system.text;using system.diagnostics;using System.runtime.interopservices;using system.threading;/******************************************************** * CSHARP_WIN32 Console Application ignores Ctrl + C * Powered by:testcs_dn * blog:http://www.php.cn/*//***************** /namespace Csharp_win32 Console Application ignores ctrlc{//define handler delegate public    delegate bool Consolectrldelegate (int ctrltype); Class Program {//import Setctrlhandlerhandler API [DllImport ("Kernel32.dll")] private static extern bo        Ol SetConsoleCtrlHandler (consolectrldelegate handlerroutine, bool Add);        When the user shuts down the console, the system sends a second message, Private const int ctrl_close_event = 2;        CTRL + C, the system sends the second message Private Const int ctrl_c_event = 0;        Ctrl+break, the system sends the second message Private Const int ctrl_break_event = 1;        The user exits (Unregisters) and the system sends a message to the private const int ctrl_logoff_event = 5; System offClosed, the system sends the message 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)//install event handling failed {Console.WriteLine ("Error");                    while (true) {Console.WriteLine ("...");                Thread.Sleep (1000);                }} else {Console.WriteLine ("OK");                    while (true) {Console.WriteLine ("...");                Thread.Sleep (1000); }}}///<summary>///handler routines, where you write handler code for the specified event///Note: When debugging execution in VS, the breakpoint is set here, but not interrupt; prompt: no source available;///</summary>//<param name= "Ctrltype" ></param>///<returns></returns> pri vate static bool Handlerroutine (int ctrltype) {switch (ctrltype) {case Ctrl_c                    _event:console.writeline ("C"); return true;                This returns true, which means that the response system is prevented from//break the operation of the program;                    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;//indicates that the response system is blocked from the operation of the program return false;//ignore processing, let the system do the default action}}}