c# 使用timer定时器操作,下次定时到了以后,上次还未执行完怎么办
------解决方案--------------------------------------------------------
开始的时候,禁用定时器,你可以在执行完毕之后再启用定时器
定时器定时执行某一个方法时,可能由于执行的时间长要比间隔的时间长,则这种情况可能导致线程并发性的问题。建议加上Lock
private static object LockObject = new Object();
private static void CheckUpdatetimer_Elapsed( object sender, ElapsedEventArgs e)
{
// 加锁检查更新锁
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>
/// 模拟长时间的操作
/// </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);
}
}
private static object LockObject = new Object();
private static void CheckUpdatetimer_Elapsed( object sender, ElapsedEventArgs e)
{
// 加锁检查更新锁
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>
/// 模拟长时间的操作
/// </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);
}
}