using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;

class MyApp
{
    private static bool TickNext = true;

    public static void Main()
    {
        Console.WriteLine("Press Enter to terminate...");

        TimerCallback callback = new TimerCallback(TickTock);

        Timer timer = new Timer(callback, null, 1000, 1000);

        Console.ReadLine(); //为什么 按 enter 键结束？？ 拖延程序执行时间，没有这行，看不什么结果。

    }

    private static void TickTock(object state)
    {
        Console.WriteLine(TickNext ? "Tick" : "Tock");

        TickNext = !TickNext;

    }
}

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