using System;

using System.Linq;

using System.Threading;

using System.Threading.Tasks;

using System.Collections.Generic;

​

class Program

{

    async static Task Main() {

​

        while (true) {

            var fireAndForgetter = new FireAndForgetter();

            await fireAndForgetter.MyMethod();

​

            Thread.Sleep(500);

            fireAndForgetter.logger = null;

​

            Console.WriteLine("--------------");

        }

​

    }

}

​

​

public class FireAndForgetter

{

    public const int ITEMS_COUNT = 1000;

    public class Logger

    {

        public void Log(string message) => Console.WriteLine(message);

    }

    public Logger logger = new Logger();

​

    public async Task MyMethod() {

        var things = Enumerable.Range(1, ITEMS_COUNT);

        var tasks = new List<Task>();

        foreach (var thing in things) {

            tasks.Add(Task.Run(() => DoSomeStuffThatTakesAWhile(thing)));

        }

        Task.WaitAll(tasks);

    }

​

    public async Task DoSomeStuffThatTakesAWhile(int a) {

        await Task.Delay(a * 15);

        //try {

        logger.Log(a.ToString());

​

        //}

        //catch (NullReferenceException ex) {

​

        //Console.WriteLine(ex.Message);

        //}

    }

}