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Thread类线程常用操作


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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