计时器不止一次 [英] Timer elapsing more than once

问题描述

你好朋友，



你好朋友，我正在研究一个基于计时器的项目。我需要计时器应该只过一次。我写了以下代码：

  class 计划
 {
 静态  void  Main（ string  [] args）
 {
 
 Start_Event_Timer（ 拉胡）; 
 Start_Event_Timer（  Varinder）; 
 
 
 Console.ReadLine（）; 
} 
 
 静态计时器t; 
  public   static   void  Start_Event_Timer （ string  s1）
 {
 Console.WriteLine（ 计时器开始于：{0}在{1}，s1，DateTime.Now.ToString（））; 
t =  new  System.Timers.Timer（ 60  *  1000 ）; 
 t.Enabled =  true ; 
 t.Elapsed + =（发件人，e）= >  G_TIMER_ELAPSED（发件人，e，s1）; 
 
 t.Start（）; 
} 
 
 
  public   static   void  G_TIMER_ELAPSED（对象发​​件人，ElapsedEventArgs e，字符串 s1 ）
 {
 Console.WriteLine（ 计时器已过去：{0}位于{1} ，s1，DateTime.Now.ToString（））; 
 
 t.AutoReset =  false ; 
 t.Enabled =  false ; 
 t.Stop（）; 
} 
 
} 

我也会告诉你我从控制台捕获的输出：

引用：

计时器开始于：Rahul于4/25/2014 11:46:04 AM

计时器开始于：Varinder at 4/25/2014 11:46:04 AM >
计时器已经过去了：Rahul于2014年4月25日上午11:47:04

计时器已经过去了：Varinder at 4/25/2014 11:47:04 AM
计时器已过去：Rahul于2014年4月25日上午11:48:04

计时器已过去：Rahul于2014/4/25 11:49:04
计时器已经过去了：Rahul于2014年4月25日上午11:50:04

计时器已经过去了：Rahul于2014/4/25 11:51:04

有什么建议吗？至于为什么即使我启动了一次计时器多次？

解决方案

你正在使用一个位置，静态字段t来存储两个计时器实例。可通过t访问的定时器是最后一个分配的Varinder。虽然代码很糟糕，但可以按预期工作，如下所示：

  public  静态  void  G_TIMER_ELAPSED（对象发​​件人，ElapsedEventArgs e， string  s1）
 {
 计时器t =（计时器）发件人;  
 Console.WriteLine （ 计时器已经过去：{0}在{1}，s1，DateTime.Now.ToString （））; 
 
 t.AutoReset =  false ; 
 t.Enabled =  false ; 
 t.Stop（）; 
} 

事件处理程序中的sender参数包含调用实例，因此只需转换对象即可获得正确的Timer。



Alan。

http://social.msdn.microsoft.com/Forums/vstudio/en-US/03e83a93 -652f-4559-ba9e-f397b1755ad7 / timerenabled-VS-timerstartstop-？论坛= csharpgeneral

Hello Friends,

Hello Friends, I am working on a timer based project. I need that the timer should elapse just once. I wrote the following code:

class Program
   {
       static void Main(string[] args)
       {

           Start_Event_Timer("Rahul");
           Start_Event_Timer("Varinder");


           Console.ReadLine();
       }

       static Timer t;
       public static void Start_Event_Timer(string s1)
       {
           Console.WriteLine("Timer started for : {0} at {1}", s1, DateTime.Now.ToString());
           t = new System.Timers.Timer(60 * 1000);
           t.Enabled = true;
           t.Elapsed += (sender, e) => G_TIMER_ELAPSED(sender, e, s1);

           t.Start();
       }


       public static void G_TIMER_ELAPSED(object sender, ElapsedEventArgs e, string s1)
       {
           Console.WriteLine("Timer elapsed for :{0} at {1} ", s1, DateTime.Now.ToString());

           t.AutoReset = false;
           t.Enabled = false;
           t.Stop();
       }

     }

I will also show you the output which i captured from the console:

Quote:

Timer started for : Rahul at 4/25/2014 11:46:04 AM
Timer started for : Varinder at 4/25/2014 11:46:04 AM
Timer elapsed for :Rahul at 4/25/2014 11:47:04 AM
Timer elapsed for :Varinder at 4/25/2014 11:47:04 AM
Timer elapsed for :Rahul at 4/25/2014 11:48:04 AM
Timer elapsed for :Rahul at 4/25/2014 11:49:04 AM
Timer elapsed for :Rahul at 4/25/2014 11:50:04 AM
Timer elapsed for :Rahul at 4/25/2014 11:51:04 AM

Any suggestions? as to why is the timer being elapsed multiple times even if i started it once?

解决方案

You are using one location, the static field t, to store two timer instances. The timer accessible via t is the last one assigned, "Varinder". Although the code is awful, it is possible to make it work as intended, like this :

public static void G_TIMER_ELAPSED(object sender, ElapsedEventArgs e, string s1)
{
    Timer t = (Timer)sender;    
    Console.WriteLine("Timer elapsed for :{0} at {1} ", s1, DateTime.Now.ToString());

    t.AutoReset = false;
    t.Enabled = false;
    t.Stop();
}

The sender parameter in the event handler contains the invoking instance and so simply casting the object gets the correct Timer.

Alan.

http://social.msdn.microsoft.com/Forums/vstudio/en-US/03e83a93-652f-4559-ba9e-f397b1755ad7/timerenabled-vs-timerstartstop-?forum=csharpgeneral

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