c# 使用timer定時器操作,上次定時到了以后,下次還未執行完怎么處理

本文轉載自查看原文 2013-05-05 17:35 7225 個人分享

c# 使用timer定時器操作,下次定時到了以后,上次還未執行完怎么辦

------解決方案--------------------------------------------------------
開始的時候，禁用定時器，你可以在執行完畢之后再啟用定時器

定時器定時執行某一個方法時，可能由於執行的時間長要比間隔的時間長，則這種情況可能導致線程並發性的問題。建議加上Lock
private static object LockObject = new Object();
private static void CheckUpdatetimer_Elapsed( object sender, ElapsedEventArgs e)
{
     // 加鎖檢查更新鎖
    lock (LockObject)
   {
   }
}
// From command line, compile with /r:System.dll
using System;
using System.Timers;
using System.Threading;

public class Timer2
{
     // static System.Windows.Forms.Timer aTimer = new System.Windows.Forms.Timer();

     private static System.Timers.Timer aTimer;
     static object o = new object();
     public static void Main()
    {
         // Normally, the timer is declared at the class level,
         // so that it stays in scope as long as it is needed.
         // If the timer is declared in a long-running method,
         // KeepAlive must be used to prevent the JIT compiler
         // from allowing aggressive garbage collection to occur
         // before the method ends. (See end of method.)
         // System.Timers.Timer aTimer;

         // Create a timer with a ten second interval.
        aTimer = new System.Timers.Timer( 2000);
        aTimer.Enabled = true;

         // Hook up the event handler for the Elapsed event.
        aTimer.Elapsed += new ElapsedEventHandler(OnTimedEvent);

         // Only raise the event the first time Interval elapses.
        aTimer.AutoReset = true;

        Console.WriteLine( " Press the Enter key to exit the program. ");
        Console.ReadLine();

         // If the timer is declared in a long-running method, use
         // KeepAlive to prevent garbage collection from occurring
         // before the method ends.
         // GC.KeepAlive(aTimer);
    }



     // Specify what you want to happen when the Elapsed event is
     // raised.
     static object name= 0;
     private static void OnTimedEvent( object source, ElapsedEventArgs e)
    {
         // lock (o)
        {
            aTimer.Enabled = false;
            aTimer.Interval = 1000;
             lock(name)
            {
                name = Convert.ToInt32(name) + 1;
                Thread.CurrentThread.Name = name.ToString();
            }
            Console.WriteLine(DateTime.Now.ToString()+ " - "+Thread.CurrentThread.Name);
             // Thread.Sleep(1000000);
            Waste();
            aTimer.Enabled = true;
        }

    }

     /// <summary>
     /// 模擬長時間的操作
     /// </summary>
     public static void Waste()
    {
         for ( int i = 0; i < Int32.MaxValue; i++)
        {

        }
         // Thread.Sleep(10000);
        Console.WriteLine(DateTime.Now.ToString()+ " 完成- "+Thread.CurrentThread.Name);
    }
}

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