Console application that exit on Ctrl-C (ready for Docker)

Ctrl-C-Console-App.md

Console application that exit on Ctrl-C (ready for Docker)

Console.ReadLine or Console.ReadKey do not work as expected under Docker container environment. Thus, typical way to solve this would be to properly handle Ctrl-C key combination.

C# snippet

using System;
using System.Threading;
using System.Threading.Tasks;

namespace TestConsole
{
  public class Prorgam
  {
    private static readonly AutoResetEvent _closing = new AutoResetEvent(false);

    public static void Main(string[] args)
    {
      Task.Factory.StartNew(() => {
        while (true)
        {
          Console.WriteLine(DateTime.Now.ToString());
          Thread.Sleep(1000);
        }
      });
      Console.CancelKeyPress += new ConsoleCancelEventHandler(OnExit);
      _closing.WaitOne();
    }

    protected static void OnExit(object sender, ConsoleCancelEventArgs args)
    {
      Console.WriteLine("Exit");
      _closing.Set();
    }
  }
}

F# snippet

open System
open System.Threading
open System.Threading.Tasks

let rec loop () =
  Console.WriteLine (DateTime.Now.ToString())
  Thread.Sleep (1000)
  loop ()

[<EntryPoint>]
let main argv =
  Task.Factory.StartNew(fun () -> loop ()) |> ignore
  let closing = new AutoResetEvent(false)
  let onExit = new ConsoleCancelEventHandler(fun _ args -> Console.WriteLine("Exit"); closing.Set() |> ignore)
  Console.CancelKeyPress.AddHandler onExit
  closing.WaitOne() |> ignore
  0

Thanks, another way is to use unix termination signals as described here

Note that in your example, you're not cancelling the task, only making the application exit and the CLR handle the termination of the task threads.