关于timer类的疑问[附代码]

using System;

using System.Threading;



class TimerExample

{

    static void Main()

    {

        AutoResetEvent autoEvent     = new AutoResetEvent(false);

        StatusChecker  statusChecker = new StatusChecker(10);



        // Create the delegate that invokes methods for the timer.

        TimerCallback timerDelegate = 

            new TimerCallback(statusChecker.CheckStatus);



        // Create a timer that signals the delegate to invoke 

        // CheckStatus after one second, and every 1/4 second 

        // thereafter.

        Console.WriteLine("{0} Creating timer.\n", 

            DateTime.Now.ToString("h:mm:ss.fff"));

        Timer stateTimer = 

                new Timer(timerDelegate, autoEvent, 1000, 250);

////////////////////////////从这里我就读不大懂了，具体各个参数是什么意思，AUTOEVENT是怎么回事，对应前后文。

        // When autoEvent signals, change the period to every 

        // 1/2 second.

        autoEvent.WaitOne(5000, false);

        stateTimer.Change(0, 500);

        Console.WriteLine("\nChanging period.\n");



        // When autoEvent signals the second time, dispose of 

        // the timer.

        autoEvent.WaitOne(5000, false);

        stateTimer.Dispose();

        Console.WriteLine("\nDestroying timer.");

    }

}



class StatusChecker

{

    int invokeCount, maxCount;



    public StatusChecker(int count)

    {

        invokeCount  = 0;

        maxCount = count;

    }



    // This method is called by the timer delegate.

    public void CheckStatus(Object stateInfo)

    {

        AutoResetEvent autoEvent = (AutoResetEvent)stateInfo;

        Console.WriteLine("{0} Checking status {1,2}.", 

            DateTime.Now.ToString("h:mm:ss.fff"), 

            (++invokeCount).ToString());



        if(invokeCount == maxCount)

        {

            // Reset the counter and signal Main.

            invokeCount  = 0;

            autoEvent.Set();

        }

    }

}