C#中Task任务和Async、Await异步非阻塞方式

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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 TaskSample  
9. {  
10.     class Program  
11.     {  
12.         static void Main(string[] args)  
13.         {  
14.             Console.WriteLine("我是主线程，线程ID：" + Thread.CurrentThread.ManagedThreadId);  
15.             //task用法一  
16.             Task task1 = new Task(() => MyAction());  
17.             task1.Start();  
18.   
19.             //task用法二  
20.             var strRes = Task.Run<string>(() => { return GetReturnStr(); });  
21.             Console.WriteLine(strRes.Result);  
22.   
23.             //task->async异步方法和await，主线程碰到await时会立即返回，继续以非阻塞形式执行主线程下面的逻辑  
24.             Console.WriteLine("---------------------------------");  
25.             Console.WriteLine("①我是主线程，线程ID：{0}", Thread.CurrentThread.ManagedThreadId);  
26.             var testResult = TestAsync();  
27.             Console.ReadKey();  
28.         }  
29.   
30.         static async Task TestAsync()  
31.         {  
32.             Console.WriteLine("②调用GetReturnResult()之前，线程ID：{0}。当前时间：{1}", Thread.CurrentThread.ManagedThreadId, DateTime.Now.ToString("yyyy-MM-dd hh:MM:ss"));  
33.             var name = GetReturnResult();  
34.             Console.WriteLine("④调用GetReturnResult()之后，线程ID：{0}。当前时间：{1}", Thread.CurrentThread.ManagedThreadId, DateTime.Now.ToString("yyyy-MM-dd hh:MM:ss"));  
35.             Console.WriteLine("⑥得到GetReturnResult()方法的结果一：{0}。当前时间：{1}", await name, DateTime.Now.ToString("yyyy-MM-dd hh:MM:ss"));  
36.             Console.WriteLine("⑥得到GetReturnResult()方法的结果二：{0}。当前时间：{1}", name.GetAwaiter().GetResult(), DateTime.Now.ToString("yyyy-MM-dd hh:MM:ss"));  
37.         }  
38.   
39.         static async Task<string> GetReturnResult()  
40.         {  
41.             Console.WriteLine("③执行Task.Run之前, 线程ID：{0}", Thread.CurrentThread.ManagedThreadId);  
42.             return await Task.Run(() =>  
43.             {  
44.                 Thread.Sleep(2000);  
45.                 Console.WriteLine("⑤GetReturnResult()方法里面线程ID: {0}", Thread.CurrentThread.ManagedThreadId);  
46.                 return "我是返回值";  
47.             });  
48.         }  
49.   
50.         static void MyAction()  
51.         {  
52.             Console.WriteLine("我是新进程，线程ID：" + Thread.CurrentThread.ManagedThreadId);  
53.         }  
54.   
55.         static string GetReturnStr()  
56.         {  
57.             return "我是返回值，线程ID：" + Thread.CurrentThread.ManagedThreadId;  
58.         }  
59.     }  
60. }