using System;

using System.Threading.Tasks;

using System.Runtime.CompilerServices;

using System.Diagnostics;

​

public class Program

{

    public static void Main()

    {

        DoStuff();

​

        Console.ReadKey();

    }

​

    private static async void DoStuff()

    {

        Console.WriteLine("Hello World");

        Stopwatch watch = new();

        watch.Start();

​

        await Delay.Seconds(1);

        Console.WriteLine("Took: {0} ms", watch.ElapsedMilliseconds);

​

        await TimeSpan.FromSeconds(1);

        Console.WriteLine("Took: {0} ms", watch.ElapsedMilliseconds);

​

        await 1.Seconds();

        Console.WriteLine("Took: {0} ms", watch.ElapsedMilliseconds);

​

        await 1;

        Console.WriteLine("Took: {0} ms", watch.ElapsedMilliseconds);

​

        watch.Stop();

        Console.WriteLine("Took total: {0} ms", watch.ElapsedMilliseconds);

        Console.WriteLine("Bye World");

    }

}

​

public class Delay

{

    public TimeSpan TimeSpan { get; }

​

    private Delay(TimeSpan timeSpan)

    {

        TimeSpan = timeSpan;

    }

​

    public static Delay Seconds(int seconds)

    {

        return new Delay(TimeSpan.FromSeconds(seconds));

    }

}

​

public static class WeirdExtensions

{

    public static TaskAwaiter GetAwaiter(this Delay delay)

    {

        return Task.Delay((int)delay.TimeSpan.TotalMilliseconds).GetAwaiter();

    }

​

    public static TaskAwaiter GetAwaiter(this TimeSpan timespan)

    {

        return Task.Delay((int)timespan.TotalMilliseconds).GetAwaiter();

    }

​

    public static TaskAwaiter GetAwaiter(this int seconds)

    {

        return Delay.Seconds(seconds).GetAwaiter();

    }

​

    public static async Task Seconds(this int seconds)

    {

        await Delay.Seconds(seconds);

    }

​

    public static async Task Seconds(this TimeSpan timespan)

    {

        await Delay.Seconds((int)timespan.TotalSeconds);

    }

​

​

​

}

​