多线程学习（一）

线程的基本操作
线程的基本操作包括：创建线程、暂停线程、线程等待、终止线程。

 1 /*-----------------------------------------------------------------------
 2                         written by helio, 2019
 3                             threadsample1
 4 -----------------------------------------------------------------------*/
 5 using system;
 6 using system.threading;
 7 
 8 namespace threadsample
 9 {
10     class program
11     {
12         static void firstprintnumbsers()
13         {
14             console.writeline("{0} starting..", thread.currentthread.name);
15             for (int i = 1; i <= 10; i++)
16             {
17                 console.writeline(i);
18                 thread.sleep(timespan.frommilliseconds(100));
19             }
20         }
21 
22         static void secondprintnumbers()
23         {
24             console.writeline("{0} starting...", thread.currentthread.name);
25             for (int i = 1; i <= 10; i++)
26             {
27                 console.writeline(i);
28                 thread.sleep(timespan.frommilliseconds(100));
29             }
30         }
31         static void main(string[] args)
32         {
33             thread t1 = new thread(firstprintnumbsers);
34             thread t2 = new thread(secondprintnumbers);
35             t1.name = "thread1";
36             t2.name = "thread2";
37             t1.start();
38             t2.start();
39             t1.join();                    
40             t2.join();
41 
42             thread.currentthread.name = "mainthread";
43             firstprintnumbsers();
44             console.readkey();
45         }
46     }
47 }

　　工作原理
在main方法外定义了方法fristprintnumbers、secondprintnumbers，该方法会被主程序和向创建的两个线程thread1、thread2使用。创建完成线程后，使用start方法启动线程，使用join方法值线程执行完成后继续执行主线程或者该线程下面的线程。

前台线程和后台线程

 1 ```
 2 /*-----------------------------------------------------------------------
 3                         written by helio, 2019
 4                             threadsample2
 5 -----------------------------------------------------------------------*/
 6 using system;
 7 using system.threading;
 8 
 9 namespace threadsample
10 {
11     class program
12     {
13         static void main(string[] args)
14         {
15             var sampleforeground = new threadsample(10);
16             var samplebackground = new threadsample(20);
17 
18             var threadone = new thread(sampleforeground.countnumbers);
19             threadone.name = "foregourndthread";
20             var threadtwo = new thread(samplebackground.countnumbers);
21             threadtwo.name = "backgroundthread";
22             threadtwo.isbackground = true;
23 
24             threadone.start();
25             threadtwo.start();
26         }
27 
28         class threadsample
29         {
30             private readonly int m_iteration;
31 
32             public threadsample(int iteration)
33             {
34                 m_iteration = iteration;
35             }
36 
37             public void countnumbers()
38             {
39                 for (int i = 0; i < m_iteration; i++)
40                 {
41                     thread.sleep(timespan.fromseconds(0.5));
42                     console.writeline("{0} prints {1}",
43                         thread.currentthread.name, i);
44                 }
45             }
46         }
47     }
48 }
49 ```

　　工作原理

　　当主程序启动时定义了两个不同的线程。默认情况下，显示创建的线程是前台线程。通过手动设置thradtow对象的isbackkgournd来创建一个后台线程。<br/>
　　当一个程序中的前台线程完成工作后，程序就会关闭，即使还有未完成工作的后台线程。所以在上述程序中，前台线程thread1完成工作后程序就会别关闭。

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