using System;

using System.Threading;

using System.Threading.Tasks;

using Nito.AsyncEx;

​

public static class Program

{

    static void Main()

    {

        AsyncContext.Run(async () =>

        {

            await DoSomethingAsync();

        });

    }

​

    static async Task DoSomethingAsync()

    {

        Console.WriteLine(SynchronizationContext.Current != null); // True

        await Task.Delay(3000);

        Console.WriteLine(SynchronizationContext.Current != null); // True

    }

}