using System;

using System.Threading;

using System.Threading.Tasks.Dataflow;

​

public class Program

{

    public static void Main()

    {

        var weakReference = InnerMethod();

        for (int i = 1; i <= 10; i++)

        {

            Thread.Sleep(100);

            GC.Collect();

            Console.WriteLine($"IsAlive: {weakReference.IsAlive}");

        }

​

        WeakReference InnerMethod()

        {

            var block = new ActionBlock<int>(n =>

            {

                Thread.Sleep(200);

                Console.WriteLine($"Processed: {n}");

            });

            block.Post(1); block.Post(2); block.Post(3);

            return new WeakReference(block);

        }

    }

}

​