c# Thread类线程常用操作详解

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概述

创建线程

线程是通过扩展 Thread 类创建的。扩展的 Thread 类调用 Start() 方法来开始子线程的执行。

下面的程序演示了这个概念：

class ThreadCreationProgram
  {
    public static void CallToChildThread()
    {
      Console.WriteLine("Child thread starts");
    }
    
    static void Main(string[] args)
    {
      ThreadStart childref = new ThreadStart(CallToChildThread);
      Console.WriteLine("In Main: Creating the Child thread");
      Thread childThread = new Thread(childref);
      childThread.Start();
      Console.ReadKey();
    }
  }

当上面的代码被编译和执行时，它会产生下列结果：

In Main: Creating the Child thread
Child thread starts

管理线程

Thread 类提供了各种管理线程的方法。

下面的实例演示了 sleep() 方法的使用，用于在一个特定的时间暂停线程。

class ThreadCreationProgram
  {
    public static void CallToChildThread()
    {
      Console.WriteLine("Child thread starts");
      // 线程暂停 5000 毫秒
      int sleepfor = 5000;
      Console.WriteLine("Child Thread Paused for {0} seconds",
               sleepfor / 1000);
      Thread.Sleep(sleepfor);
      Console.WriteLine("Child thread resumes");
    }
    
    static void Main(string[] args)
    {
      ThreadStart childref = new ThreadStart(CallToChildThread);
      Console.WriteLine("In Main: Creating the Child thread");
      Thread childThread = new Thread(childref);
      childThread.Start();
      Console.ReadKey();
    }
  }

当上面的代码被编译和执行时，它会产生下列结果：

In Main: Creating the Child thread
Child thread starts
Child Thread Paused for 5 seconds
Child thread resumes

销毁线程

Abort() 方法用于销毁线程。

通过抛出 threadabortexception 在运行时中止线程。这个异常不能被捕获，如果有 finally 块，控制会被送至 finally 块。

下面的程序说明了这点：

class ThreadCreationProgram
  {
    public static void CallToChildThread()
    {
      try
      {

        Console.WriteLine("Child thread starts");
        // 计数到 10
        for (int counter = 0; counter <= 10; counter++)
        {
          Thread.Sleep(500);
          Console.WriteLine(counter);
        }
        Console.WriteLine("Child Thread Completed");

      }
      catch (ThreadAbortException e)
      {
        Console.WriteLine("Thread Abort Exception");
      }
      finally
      {
        Console.WriteLine("Couldn't catch the Thread Exception");
      }

    }
    
    static void Main(string[] args)
    {
      ThreadStart childref = new ThreadStart(CallToChildThread);
      Console.WriteLine("In Main: Creating the Child thread");
      Thread childThread = new Thread(childref);
      childThread.Start();
      // 停止主线程一段时间
      Thread.Sleep(2000);
      // 现在中止子线程
      Console.WriteLine("In Main: Aborting the Child thread");
      childThread.Abort();
      Console.ReadKey();
    }
  }

当上面的代码被编译和执行时，它会产生下列结果：

In Main: Creating the Child thread
Child thread starts
0
1
2
In Main: Aborting the Child thread
Thread Abort Exception
Couldn't catch the Thread Exception

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