Async异步编程入门示例

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 
 7 namespace AsyncDemo
 8 {
 9     class Program
10     {
11         static void Main(string[] args)
12         {
13             Console.WriteLine("异步方法测试开始！");//标记时间戳开始
14             AsyncMethod(0);//调用异步方法
15             Console.WriteLine("异步方法结束");//标记时间戳结束
16             Console.ReadKey();
17         }
18 
19         //异步操作
20         private static async void AsyncMethod(int input)
21         {
22             Console.WriteLine("进入异步操作！");
23             var result = await AsyncWork(input);
24             Console.WriteLine("最终结果{0}", result);
25             Console.WriteLine("退出异步操作");
26         }
27 
28         private static async Task<int> AsyncWork(int val)
29         {
30             for (int i = 0; i < 5; i++)
31             {
32                 Console.WriteLine("耗时操作{0}", i);
33                 await Task.Delay(1000);
34                 val++;
35             }
36             return val;
37         }
38     }
39 }
输出：