多线程学习（一）

线程的基本操做
线程的基本操做包括：建立线程、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 }

　　工做原理
在Main方法外定义了方法FristPrintNumbers、SecondPrintNumbers，该方法会被主程序和向建立的两个线程Thread一、Thread2使用。建立完成线程后，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 ```

　　工做原理

　　当主程序启动时定义了两个不一样的线程。默认状况下，显示建立的线程是前台线程。经过手动设置ThradTow对象的IsBackkgournd来建立一个后台线程。<br/>
　　当一个程序中的前台线程完成工做后，程序就会关闭，即便还有未完成工做的后台线程。因此在上述程序中，前台线程Thread1完成工做后程序就会别关闭。

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