C#中的异步多线程6 Delay

    class Simple
    {
        Stopwatch sw = new Stopwatch();
        public void DoRun()
        {
            Console.WriteLine("Caller:Before call");
            ShowDelayAsync();
            Console.WriteLine("Caller:After call");
        }
        private async void ShowDelayAsync()
        {
            sw.Start();
            Console.WriteLine("Before Delay:{0}", sw.Elapsed.TotalMilliseconds);
            await Task.Delay(1000);
            Console.WriteLine("After Delay:{0}", sw.Elapsed.TotalMilliseconds);
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Simple sim = new Simple();
            sim.DoRun();
            Console.Read();
        }
    }