ThreadPoolHelper线程池源代码

   delegate { Console.WriteLine("b"); },
   delegate { Console.WriteLine("c"); }
   );
  
   Console.WriteLine("Main thread does some work, then sleeps.");
   // If you comment out the Sleep, the main thread exits before
   // the thread pool task runs. The thread pool uses background
   // threads, which do not keep the application running. (This
   // is a simple example of a race condition.)
   Thread.Sleep(1000);
  
   Console.WriteLine("Main thread exits.");
   }
  
   // This thread procedure performs the task.
   static void ThreadProc()
   {
   // No state object was passed to QueueUserWorkItem, so
   // stateInfo is null.
   Console.WriteLine("Hello from the thread pool.()");
   }
  
   // This thread procedure performs the task.
   static void ThreadProc(object stateInfo)
   {
   // No state object was passed to QueueUserWorkItem, so
   // stateInfo is null.
   Console.WriteLine("Hello from the thread pool.(object stateInfo)");
   }
   }
  }  

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