1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5 using System.Threading; 6 using System.Threading.Tasks; 7  8 namespace CloudLearning.UI 9 {10     class PRogram11     {12         static void Main(string[] args)13         {14             AsyncPrintHelloWorld();15             Console.ReadLine();16         }17 18         public async static void AsyncPrintHelloWorld()19         {20             Console.WriteLine("異步方法調用開始");  21             var result1 = TMothd1();22             var result2 = TMothd2();23             var result3 = TMothd3();24             Console.WriteLine("異步方法完成");25             int r1 = await result1;26             int r2= await result2;27             int r3 = await result3;28             Console.WriteLine("{0},{1},{2}", r1, r2, r3);29         }30 31         public async static Task<int> TMothd1()32         {33             return await Task.Factory.StartNew(() =>34             {35                 Thread.Sleep(5 * 1000);36                 Console.WriteLine("TMothd1 完成");37                 return 1;38             });39         }40 41         public async static Task<int> TMothd2()42         {43             return await Task.Factory.StartNew(() =>44             {45                 Thread.Sleep(10 * 1000);46                 Console.WriteLine("TMothd2 完成");47                 return 2;48             });49         }50         public async static Task<int> TMothd3()51         {52             return await Task.Factory.StartNew(() =>53             {54                 Thread.Sleep(15 * 1000);55                 Console.WriteLine("TMothd3 完成");56                 return 3;57             });58         }59 60     }61 }