Console.WriteLine("主线程...");

 ThreadPool.QueueUserWorkItem(DoSomething, );

 Console.WriteLine("主线程继续执行...");

 static void DoSomething(object state)

         {

             Thread.Sleep();

             int num = (int)state;

             Console.WriteLine("DoSomething..., Number:" + num);

             return;

         }

 CallContext.LogicalSetData("Name", "Mike");

 //线程池线程可以访问逻辑调用上下文数据

 ThreadPool.QueueUserWorkItem(state => Console.WriteLine("Name:{0}", CallContext.LogicalGetData("Name")));

 //取消执行上下文在异步线程间的流动

 ExecutionContext.SuppressFlow();

 //线程池线程将不能访问逻辑调用上下文数据

 ThreadPool.QueueUserWorkItem(state => Console.WriteLine("Name:{0}", CallContext.LogicalGetData("Name")));

 //恢复执行上下文在异步线程间的流动

 ExecutionContext.RestoreFlow();

 //...

 //注册取消CancelationToken时调用的委托

 var cts = new CancellationTokenSource();

 cts.Token.Register(() => Console.WriteLine("The operation will be cancelled. -- 1"));

 cts.Token.Register(() => Console.WriteLine("The operation will be cancelled. -- 2"));

 //线程开始执行操作

 ThreadPool.QueueUserWorkItem(a => Count(cts.Token, ));

 Console.WriteLine("Please <Enter> to cancel the operation.");

 Console.ReadLine();

 //传达取消请求

 cts.Cancel();

 //执行计数操作

 static void Count(CancellationToken token, int countTo)

 {

     for (int i = ; i < countTo; i++)

     {

         if (token.IsCancellationRequested)  //是否已请求取消

         {

             break;

         }

         Thread.Sleep();

         Console.WriteLine(i);

     }

 }