// @nuget: Nito.AsyncEx

using System;

using System.Threading;

using Nito.AsyncEx;

public class Program

{

    public static void Main()

    {

        AsyncContext.Run(() =>

        {

            IProgress<int> progress = new Progress<int>(value => Print($"Progress: {value}"));

            //IProgress<int> progress = new SynchronousProgress<int>(value => Print($"Progress: {value}"));

            Console.WriteLine(progress);

            progress.Report(0);

            progress.Report(100);

            Print("Done");

        });

    }

​

    public class SynchronousProgress<T> : IProgress<T>

    {

        private readonly Action<T> _handler;

        private readonly SynchronizationContext _synchronizationContext;

        public SynchronousProgress(Action<T> handler)

        {

            ArgumentNullException.ThrowIfNull(handler);

            _handler = handler;

            _synchronizationContext = SynchronizationContext.Current;

        }

​

        public void Report(T value)

        {

            if (_synchronizationContext is not null)

            {

                _synchronizationContext.Send(s => _handler((T)s), value);

            }

            else

            {

                _handler(value);

            }

        }

    }

​

    private static void Print(object value)

    {

        Console.WriteLine($@"{DateTime.Now:HH:mm:ss.fff} [{Thread.CurrentThread

            .ManagedThreadId}] > {value}");

    }

}