Scott Hanselman

More tips from Sairama - Catching Ctrl-C from a .NET Console Application

March 31, '03 Comments [1] Posted in Web Services
Sponsored By

Ever want to catch Ctrl-C from a .NET Console Application and perform some crucial cleanup?  Well, you can...

using System;
using
System.Runtime.InteropServices;
using
System.Text;
using
System.Threading;

namespace Testing
{
/// <summary>
///
Class to catch console control events (ie CTRL-C) in C#.
///
Calls SetConsoleCtrlHandler() in Win32 API
/// </summary>
public class ConsoleCtrl: IDisposable
{
/// <summary>
///
The event that occurred.
/// </summary>
public enum ConsoleEvent
{
CtrlC = 0,CtrlBreak = 1,CtrlClose = 2,CtrlLogoff = 5,CtrlShutdown =
6
}

/// <summary>
///
Handler to be called when a console event occurs.
/// </summary>
public delegate void ControlEventHandler(ConsoleEvent consoleEvent);

/// <summary>
///
Event fired when a console event occurs
/// </summary>
public event ControlEventHandler ControlEvent;

ControlEventHandler eventHandler;

public ConsoleCtrl()
{
// save this to a private var so the GC doesn't collect it...
eventHandler = new ControlEventHandler(Handler);
SetConsoleCtrlHandler
(eventHandler, true);
}

~ConsoleCtrl()
{
Dispose
(false);}

public void Dispose()
{
Dispose
(true);
GC.SuppressFinalize
(this);
}

void Dispose(bool disposing)
{
 if
(eventHandler != null)
 {
  SetConsoleCtrlHandler
(eventHandler, false);
  eventHandler = null
;
 }
}

private void Handler(ConsoleEvent consoleEvent)
{
if
(ControlEvent != null)
 
ControlEvent
(consoleEvent);
}

[DllImport("kernel32.dll")]
static extern bool SetConsoleCtrlHandler
(ControlEventHandler e, bool add);
}

}

using System;
using
System.Reflection;
using
System.Diagnostics;

namespace
.Testing
{
class Test
{
public
static void inputHandler(ConsoleCtrl.ConsoleEvent consoleEvent)
{
if
(consoleEvent == ConsoleCtrl.ConsoleEvent.CtrlC)
{
Console.WriteLine
("Stopping due to user input");
// Cleanup code here.
System.Environment.Exit(-1);
}
}

[STAThread]
static void Main
(string[] args)
{

ConsoleCtrl cc = new ConsoleCtrl();
cc.ControlEvent += new
ConsoleCtrl.ControlEventHandler(inputHandler);
for
( ;; )
{
Console.WriteLine
("Press any key...");
Console.ReadLine
();
}
}
}
}

About Scott

Scott Hanselman is a former professor, former Chief Architect in finance, now speaker, consultant, father, diabetic, and Microsoft employee. He is a failed stand-up comic, a cornrower, and a book author.

facebook twitter subscribe
About   Newsletter
Sponsored By
Hosting By
Dedicated Windows Server Hosting by SherWeb
Thursday, March 10, 2005 12:02:33 PM UTC
the codes work well, thank you!
junli
Comments are closed.

Disclaimer: The opinions expressed herein are my own personal opinions and do not represent my employer's view in any way.