代码：

using System;
using System.Collections.Generic;
using System.Text;
namespace NET.MST.Sixth.Reenter
{
  class Reenter
  {
    //用来造成线程同步问题的静态成员
    private static int TestInt1=0;
    private static int TestInt2 = 0;
    private static object locko = new object();
    static void Main(string[] args)
    {
      Console.WriteLine("System.Timers.Timer 回调方法重入测试：");
      TimersTimerReenter();
      //这里确保已经开始的回调方法有机会结束
      System.Threading.Thread.Sleep(2 * 1000);
      Console.WriteLine("System.Threading.Timer 回调方法重入测试：");
      ThreadingTimerReenter();
      Console.Read();
    }
    /// <summary>
    /// 展示System.Timers.Timer的回调方法重入
    /// </summary>
    static void TimersTimerReenter()
    {
      System.Timers.Timer timer = new System.Timers.Timer();
      timer.Interval = 100;    //100毫秒
      timer.Elapsed += TimersTimerHandler;
      timer.Start();
      System.Threading.Thread.Sleep(2 * 1000); //运行2秒
      timer.Stop();
    }
    /// <summary>
    /// 展示System.Threading.Timer的回调方法重入
    /// </summary>
    static void ThreadingTimerReenter()
    {
      //100毫秒
      using (System.Threading.Timer timer = new System.Threading.Timer
       (new System.Threading.TimerCallback(ThreadingTimerHandler), null, 0, 100))
      {
        System.Threading.Thread.Sleep(2 * 1000); //运行2秒
      }
    }
    /// <summary>
    /// System.Timers.Timer的回调方法
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="args"></param>
    private static void TimersTimerHandler(object sender,EventArgs args)
    {
      lock (locko)
      {
        Console.WriteLine("测试整数：" + TestInt1.ToString());
        //睡眠10秒，保证方法重入
        System.Threading.Thread.Sleep(300);
        TestInt1++;
        Console.WriteLine("自增1后测试整数：" + TestInt1.ToString());
      }
    }
    /// <summary>
    /// System.Threading.Timer的回调方法
    /// </summary>
    /// <param name="state"></param>
    private static void ThreadingTimerHandler(object state)
    {
      lock (locko)
      {
        Console.WriteLine("测试整数：" + TestInt2.ToString());
        //睡眠10秒，保证方法重入
        System.Threading.Thread.Sleep(300);
        TestInt2++;
        Console.WriteLine("自增1后测试整数：" + TestInt2.ToString());
      }
    }
  }
}

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