在Windows服务中使用Timer

Question

我有一个Windows服务,我想在每10秒钟创建一个文件.

我得到了很多评论,Windows服务中的Timer将是最好的选择.

我怎样才能做到这一点？

Answer 1

首先,选择合适的计时器.您想要System.Timers.Timer或者System.Threading.Timer- 不要使用与UI框架相关联的(例如System.Windows.Forms.Timer或DispatcherTimer).

定时器通常很简单

1. 设置滴答间隔
2. 向Elapsed事件添加处理程序(或在构造时传递回调),
3. 必要时启动计时器(不同类的工作方式不同)

一切都会好的.

样品:

// System.Threading.Timer sample
using System;
using System.Threading;

class Test
{
    static void Main() 
    {
        TimerCallback callback = PerformTimerOperation;
        Timer timer = new Timer(callback);
        timer.Change(TimeSpan.Zero, TimeSpan.FromSeconds(1));
        // Let the timer run for 10 seconds before the main
        // thread exits and the process terminates
        Thread.Sleep(10000);
    }

    static void PerformTimerOperation(object state)
    {
        Console.WriteLine("Timer ticked...");
    }
}

// System.Timers.Timer example
using System;
using System.Threading;
using System.Timers;
// Disambiguate the meaning of "Timer"
using Timer = System.Timers.Timer;

class Test
{
    static void Main() 
    {
        Timer timer = new Timer();
        timer.Elapsed += PerformTimerOperation;
        timer.Interval = TimeSpan.FromSeconds(1).TotalMilliseconds;
        timer.Start();
        // Let the timer run for 10 seconds before the main
        // thread exits and the process terminates
        Thread.Sleep(10000);
    }

    static void PerformTimerOperation(object sender,
                                      ElapsedEventArgs e)
    {
        Console.WriteLine("Timer ticked...");
    }
}

我在这个页面上有更多的信息,虽然我很长时间没有更新.

Answer 2

我不建议,System.Timers.Timer因为它默默地吃掉未处理的异常,因此隐藏了你应该修复的错误.如果你没有正确处理异常,那么你的代码就会爆炸.

至于System.Threading.Timer我倾向于使用该Change方法以这样的模式启动/停止计时器:

public class MyCoolService
{
    Timer _timer;

    public MyCoolService()
    {
        _timer = new Timer(MyWorkerMethod, Timeout.Infinite, Timeout.Infinite);
    }

    protected void OnStart()
    {
        _timer.Change(15000, Timeout.Infinte);
    }

    protected void MyWorkerMethod()
    {
        //pause timer during processing so it
        // wont be run twice if the processing takes longer
        // than the interval for some reason
        _timer.Change(Timeout.Infinite, Timeout.Infinite); 

        try
        {
            DoSomeWork();
        }
        catch (Exception err)
        {
            // report the error to your manager if you dare
        }

        // launch again in 15 seconds
        _timer.Change(15000, Timeout.Infinite);
    }

}