public virtual bool WaitOne(TimeSpan timeout)
        {
            return WaitOne(timeout, false);
        }

        [System.Security.SecuritySafeCritical]  // auto-generated
        [SuppressMessage("Microsoft.Concurrency", "CA8001", Justification = "Reviewed for thread-safety.")]
        private bool WaitOne(long timeout, bool exitContext)
        {
            return InternalWaitOne(safeWaitHandle, timeout, hasThreadAffinity, exitContext);
        }
        [System.Security.SecurityCritical] 
        internal static bool InternalWaitOne(SafeHandle waitableSafeHandle, long millisecondsTimeout, bool hasThreadAffinity, bool exitContext)
        {
            Contract.EndContractBlock();
            int ret = WaitOneNative(waitableSafeHandle, (uint)millisecondsTimeout, hasThreadAffinity, exitContext);
           
            if (ret == WAIT_ABANDONED)
            {
                ThrowAbandonedMutexException();
            }
            return (ret != WaitTimeout);
        }
        //調(diào)用win32 waitforsingleobjectEx
        [System.Security.SecurityCritical]
        [ResourceExposure(ResourceScope.None)]
        [MethodImplAttribute(MethodImplOptions.InternalCall)]
        private static extern int WaitOneNative(SafeHandle waitableSafeHandle, uint millisecondsTimeout, bool hasThreadAffinity, bool exitContext);
 

WaitHandle
　　|——EventWaitHandle                  事件構(gòu)造。
　　　　|——AutoResetEvent
　　　　|——ManualResetEvent
　　|——Semaphore                         信號量構(gòu)造。
　　|——Mutex                                 互斥體構(gòu)造。

static void Main(string[] args)
        {
            //AutoResetEvent example
            //AutoResetEvent 通知正在等待的線程已發(fā)生的事件。
            AutoResetEvent waitHandler = new AutoResetEvent(false);//false 即非終止，未觸發(fā)。
            new Thread(() =>
            {
                waitHandler.WaitOne();  //阻塞當(dāng)前線程，等待底層內(nèi)核對象收到信號。
                Console.WriteLine("接收到信號，開始處理。");

            }).Start();
            new Thread(() =>
            {
                Thread.Sleep(2000);
                Console.WriteLine("發(fā)信號");
                waitHandler.Set();    //向內(nèi)核對象發(fā)送信號。設(shè)置事件對象為非終止?fàn)顟B(tài)、false，解除阻塞。 

            }).Start();
            //waitHandler.Close(); //釋放句柄資源。
            //waitHandler.Reset();  //手動設(shè)置事件為非終止?fàn)顟B(tài)、false，線程阻止。
            Console.ReadLine();
        }

 ManualResetEvent manualWaitHandler = new ManualResetEvent(false);//false 即非終止，未觸發(fā)。
            new Thread(() =>
            {
                manualWaitHandler.WaitOne();  //阻塞當(dāng)前線程對象，等待信號。
                Console.WriteLine("接收到信號，開始處理。");

                manualWaitHandler.Reset();  //手動 設(shè)置事件對象狀態(tài)為非終止?fàn)顟B(tài)，false。
                manualWaitHandler.WaitOne();  //這里直接阻塞等待無效，因?yàn)槭录ο筮€是true，必須手動調(diào)reset。
                Console.WriteLine("第二次接收到信號，開始處理。");

            }).Start();
            new Thread(() =>
            {
                Thread.Sleep(2000);
                Console.WriteLine("發(fā)信號");
                manualWaitHandler.Set();    //向事件對象發(fā)送ok信號。。

                Thread.Sleep(2000);
                Console.WriteLine("第二次發(fā)信號");
                manualWaitHandler.Set();
            }).Start();
            Console.ReadLine();
 

 [DllImport(KERNEL32, SetLastError=true, CharSet=CharSet.Auto, BestFitMapping=false)]
        [ResourceExposure(ResourceScope.Machine)] // Machine or none based on the value of "name"
        internal static extern SafeWaitHandle CreateEvent(SECURITY_ATTRIBUTES lpSecurityAttributes, bool isManualReset, bool initialState, String name);