聊聊Thread類線程常用操作
本文轉載自微信公眾號「UP技術控」,作者conan5566。轉載本文請聯系UP技術控公眾號。
創建線程
線程是通過擴展 Thread 類創建的。擴展的 Thread 類調用 Start() 方法來開始子線程的執行。
下面的程序演示了這個概念:
- 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();
- }
- }
當上面的代碼被編譯和執行時,它會產生下列結果:
- In Main: Creating the Child thread
- Child thread starts
管理線程
Thread 類提供了各種管理線程的方法。
下面的實例演示了 sleep() 方法的使用,用于在一個特定的時間暫停線程。
- class ThreadCreationProgram
- {
- public static void CallToChildThread()
- {
- Console.WriteLine("Child thread starts");
- // 線程暫停 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();
- }
- }
當上面的代碼被編譯和執行時,它會產生下列結果:
- In Main: Creating the Child thread
- Child thread starts
- Child Thread Paused for 5 seconds
- Child thread resumes
銷毀線程
Abort() 方法用于銷毀線程。
通過拋出 threadabortexception 在運行時中止線程。這個異常不能被捕獲,如果有 finally 塊,控制會被送至 finally 塊。
下面的程序說明了這點:
- class ThreadCreationProgram
- {
- public static void CallToChildThread()
- {
- try
- {
- Console.WriteLine("Child thread starts");
- // 計數到 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();
- // 停止主線程一段時間
- Thread.Sleep(2000);
- // 現在中止子線程
- Console.WriteLine("In Main: Aborting the Child thread");
- childThread.Abort();
- Console.ReadKey();
- }
- }
當上面的代碼被編譯和執行時,它會產生下列結果:
- 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