C# Async与Await用法

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Threading;
 using System.Threading.Tasks;

 namespace CloudLearning.UI
 {
     class Program
     {
         static void Main(string[] args)
         {
             AsyncPrintHelloWorld();
             Console.ReadLine();
         }

         public async static void AsyncPrintHelloWorld()
         {
             Console.WriteLine("异步方法调用开始");
             var result1 = TMothd1();
             var result2 = TMothd2();
             var result3 = TMothd3();
             Console.WriteLine("异步方法完成");
             int r1 = await result1;
             int r2= await result2;
             int r3 = await result3;
             Console.WriteLine("{0},{1},{2}", r1, r2, r3);
         }

         public async static Task<int> TMothd1()
         {
             return await Task.Factory.StartNew(() =>
             {
                 Thread.Sleep( * );
                 Console.WriteLine("TMothd1 完成");
                 return ;
             });
         }

         public async static Task<int> TMothd2()
         {
             return await Task.Factory.StartNew(() =>
             {
                 Thread.Sleep( * );
                 Console.WriteLine("TMothd2 完成");
                 return ;
             });
         }
         public async static Task<int> TMothd3()
         {
             return await Task.Factory.StartNew(() =>
             {
                 Thread.Sleep( * );
                 Console.WriteLine("TMothd3 完成");
                 return ;
             });
         }

     }
 }