WaitHandle.WaitOne的第二参数

using System;
using System.Threading;
using System.Runtime.Remoting.Contexts;

namespace ConsoleApplication4
{
    [Synchronization]
    public class MyCounter : ContextBoundObject
    {

        private int _expectedCounterVal;
        private int _currentCounterVal;
        private ManualResetEvent _event = new ManualResetEvent(false);

        public void WaitUntilCounterIs(int counterVal)
        {
            _expectedCounterVal = counterVal;
            _event.WaitOne(TimeSpan.FromDays(1), true);
        }

        public void IncrementCounter()
        {
            if (++_currentCounterVal >= _expectedCounterVal)
            {
                _event.Set();
            }
        }


        static void Main()
        {
            MyCounter counter = new MyCounter();
            Output("Main starting.");
            ThreadPool.QueueUserWorkItem(new WaitCallback(WorkThreadAddCounter), counter);
            counter.WaitUntilCounterIs(10);
            Output("Main ending.");
        }

        static void WorkThreadAddCounter(object counter)
        {
            Output("Work starting.");
            for (int i = 0; i < 20; i++)
            {
                Thread.Sleep(10);
                ((MyCounter)counter).IncrementCounter();
                Output(i.ToString());
            }
            Output("Work ending.");
        }

        static void Output(string text)
        {
            Console.WriteLine(DateTime.Now.ToString("HH:mm:ss ") + text);
        }
    }


}