A Simple Console Periodic Loop in C#

By Mike Hadlow, published Jul 9, 2021

I found myself writing the same code several times for a simple console periodic loop, so I’m posting the framework here mainly for my own benefit. This uses C# 7’s new async Main entry point and avoids the need to spawn a new thread for the loop. Worth noting though that each iteration after the Task.Delay will run on a threadpool thread.

using System;
using System.Threading;
using System.Threading.Tasks;
using static System.Console;

namespace SimpleConsoleLoop
{
    class Program
    {
        static Task Main()
        {
            var cts = new CancellationTokenSource();

            CancelKeyPress += (_, args) => 
            {
                cts.Cancel();
                cts.Dispose();
                args.Cancel = true;
            };

            WriteLine("Starting loop. Ctrl-C to stop.");
            return RunLoop(cts.Token);
        }

        static async Task RunLoop(CancellationToken cancellation)
        {
            try
            {
                while (!cancellation.IsCancellationRequested)
                {
                    await Task.Delay(1000, cancellation);

                    WriteLine($"Loop! On thread: {Thread.CurrentThread.ManagedThreadId}");
                }
            }
            catch (TaskCanceledException) { }
            catch (Exception exception)
            {
                WriteLine(exception.ToString());
            }
        }
    }
}

Hi, I’m Mike Hadlow. Software developer, architect, blogger and open source developer.

Find my old blog at Code Rant. This ran from 2005 to 2020 and has hundreds of posts.

All code on this blog is published under an MIT licence. You are free to copy it and use it for any purpose without attribution. There is no warranty whatsoever.

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