关于QueueUserWorkItem线程的问题

public static void Main()
  {
  // ThreadPool.QueueUserWorkItem(new WaitCallback(ThreadProc));

  ThreadPool.QueueUserWorkItem(ThreadProc);

  Console.WriteLine("Main thread does some work, then sleeps.");
  Thread.Sleep(1000);
  Console.WriteLine("Main thread exits.");
  }
  static void ThreadProc(Object stateInfo)
  {
  Console.WriteLine("Hello from the thread pool.");
  }

上面new WaitCallback(ThreadProc)和ThreadProc作为参数都可以，有什么区别吗？

http://blog.csdn.net/augusdi/article/details/5701798