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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