using System;

using System.Runtime.CompilerServices;

using System.Threading;

using System.Threading.Tasks;

​

static class Program

{

    static async Task Main()

    {

        var testTask = Test();

        await Task.Delay(1000);

        Console.WriteLine("Exception was captured by async state machine");

        await testTask;

    }

​

    static async Task Test()

    {

        await new YieldThreadPoolAwaiter();

        throw new ApplicationException("Oops!");

    }

    public struct YieldThreadPoolAwaiter : INotifyCompletion

    {

        public void OnCompleted(Action continuation)

        {

            if (continuation == null)

            {

                throw new ArgumentNullException(nameof(continuation));

            }

            ThreadPool.QueueUserWorkItem(RunAction, continuation);

        }

​

        public void GetResult() { }

​

        private static void RunAction(object state)

        {

            ((Action)state)();

        }

​

        public bool IsCompleted

        {

            get { return false; }

        }

        public YieldThreadPoolAwaiter GetAwaiter() => this;

    }

}

​