并行运行两个异步任务，并在.NET 4.5中收集结果

您应该使用Task.Delay而不是Sleep进行异步编程，然后使用Task.WhenAll组合任务结果。这些任务将并行运行。

public class Program    {        static void Main(string[] args)        { Go();        }        public static void Go()        { GoAsync(); Console.ReadLine();        }        public static async void GoAsync()        { Console.WriteLine("Starting"); var task1 = Sleep(5000); var task2 = Sleep(3000); int[] result = await Task.WhenAll(task1, task2); Console.WriteLine("Slept for a total of " + result.Sum() + " ms");        }        private async static Task<int> Sleep(int ms)        { Console.WriteLine("Sleeping for {0} at {1}", ms, Environment.TickCount); await Task.Delay(ms); Console.WriteLine("Sleeping for {0} finished at {1}", ms, Environment.TickCount); return ms;        }    }