C#线程安全使用（五）

  class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("当前线程{0},当前状态{1}", Thread.CurrentThread.GetHashCode(), Thread.CurrentThread.ThreadState);
            //使用线程池创建线程，然后取消线程
            CancelWithThreadPoolMiniSnippet();
        }
        static CancellationTokenSource cts = new CancellationTokenSource();
        static CancellationToken token = cts.Token;
        static void CancelWithThreadPoolMiniSnippet()
        {
            Console.WriteLine("当前线程{0},当前状态{1}", Thread.CurrentThread.GetHashCode(), Thread.CurrentThread.ThreadState);

            #region 使用QueueUserWorkItem的构造函数，传递cts.Token,但我不喜欢这个模式 跟踪不了状态
            //ThreadPool.QueueUserWorkItem(new WaitCallback(DoSomeWork), ctn);
            #endregion

            #region 使用传递参数的模式 传递CancellationToken，这里的cts.Token是作为Action的参数传递的
            //var action = new Action<object>(DoSomeWork);
            //Task t = new Task(action, ctn);
            //t.Start();
            //Console.WriteLine("开始，当前线程{0},当前状态{1}", t.GetHashCode(), t.Status);
            #endregion

            #region 使用Task的构造函数，传递cts.Token,但CancellationTokenSource要弄成全局变量，否则方法找不到，就取消不了。
            //Task t = new Task(Work, cts.Token);
            //t.Start();
            #endregion

            #region 注册回调函数，当CancellationTokenSource.Cancel()执行后，调用回调函数 
            token.Register(CallBack, true);  //注册回调函数
            Task t = new Task(Work);
            t.Start();
            #endregion

            Thread.SpinWait(5000000);
            
            cts.Cancel();
            Console.WriteLine("结束，当前线程{0},当前状态{1}", t.GetHashCode(), t.Status);
            Console.Read();
        }

       
        static void DoSomeWork(object obj)
        {
            CancellationToken token = (CancellationToken)obj;
            for (int i = 0; i < 100000; i++)
            {
                Console.WriteLine(i);
                // Simulating work.
                //Thread.SpinWait(5000000);

                if (token.IsCancellationRequested)
                {
                   
                    break;
                }
            }
        }


        static void Work()
        {
           
            for (int i = 0; i < 100000; i++)
            {
                Console.WriteLine(i);
                if (token.IsCancellationRequested)
                {

                    break;
                }
            }
        }

        static void CallBack()
        {
            
            Console.WriteLine("I'm call back!"   );
        }
    }