Capture Console Exit C#

Capture console exit C#

I am not sure where I found the code on the web, but I found it now in one of my old projects. This will allow you to do cleanup code in your console, e.g. when it is abruptly closed or due to a shutdown...

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

private delegate bool EventHandler(CtrlType sig);
static EventHandler _handler;

enum CtrlType
{
  CTRL_C_EVENT = 0,
  CTRL_BREAK_EVENT = 1,
  CTRL_CLOSE_EVENT = 2,
  CTRL_LOGOFF_EVENT = 5,
  CTRL_SHUTDOWN_EVENT = 6
}

private static bool Handler(CtrlType sig)
{
  switch (sig)
  {
      case CtrlType.CTRL_C_EVENT:
      case CtrlType.CTRL_LOGOFF_EVENT:
      case CtrlType.CTRL_SHUTDOWN_EVENT:
      case CtrlType.CTRL_CLOSE_EVENT:
      default:
          return false;
  }
}


static void Main(string[] args)
{
  // Some biolerplate to react to close window event
  _handler += new EventHandler(Handler);
  SetConsoleCtrlHandler(_handler, true);
  ...
}

Update

For those not checking the comments it seems that this particular solution does not work well (or at all) on Windows 7. The following thread talks about this

On Exit for a Console Application

You need to hook to console exit event and not your process.

http://geekswithblogs.net/mrnat/archive/2004/09/23/11594.aspx

Capture console exit C#

Gracefully (and controlled) exit from .NET console application

So the solution I found has the following code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp1
{
    class Program
    {
        private static bool keepRunning = true;

        public static void Main(string[] args)
        {
            Console.WriteLine("Main started");

            Console.CancelKeyPress += delegate (object sender, ConsoleCancelEventArgs e) {
                e.Cancel = true;
                keepRunning = false;
            };

            while (keepRunning)
            {
                Console.WriteLine("Doing really evil things...");

                System.Threading.Thread.Sleep(3000);
            }

            Console.WriteLine("Exited gracefully");
        }
    }
}

Detect console exit event

Use the CancelKeyPress event (fired on CTRL+C).

Console.CancelKeyPress += Console_CancelKeyPress;

do things before close here

private static void Console_CancelKeyPress(object sender, ConsoleCancelEventArgs e)
{
    Process.GetCurrentProcess().CloseMainWindow();
}

Hopefully this is what you tried to do.

What is the command to exit a console application in C#?

You can use Environment.Exit(0); and Application.Exit

Environment.Exit(0) is cleaner.

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