C# 定时器运用

在晚上12点执行任务

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.Linq;
using System.ServiceProcess;
using System.Text;
using System.IO;

namespace WindowsService2
{
public partial class Service1 : ServiceBase
{
System.Timers.Timer timer1; //计时器
WindowTaske w = new WindowTaske();
public Service1()
{
InitializeComponent();
}

protected override void OnStart(string[] args)
{
timer1 = new System.Timers.Timer();

timer1.Interval = 3000; //设置计时器事件间隔执行时间

timer1.Elapsed += new System.Timers.ElapsedEventHandler(timer1_Elapsed);

timer1.Enabled = true;

if (!EventLog.SourceExists("OnStart222"))
{
EventLog.CreateEventSource("OnStart222", "jason");
}

EventLog.WriteEntry("OnStart222", "开始任务了");
}

protected override void OnStop()
{
this.timer1.Enabled = false;
EventLog.WriteEntry("OnStart222", "任务结束");
}

private void timer1_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
{
if (e.SignalTime.Hour == 0 && e.SignalTime.Minute == 0 && e.SignalTime.Second == 0)//晚上12点发送邮件
{
//发送邮件方法
}
}

}
}

C# 定时器运用

原文：http://www.cnblogs.com/louby/p/5206321.html