在WebService中使用Timer的方法

   在WebService开发时，有时需要做轮询操作，可以使用Timer ，注意是System.Timers.Timer，且事件的触发必须是经过一次WebService调用后。 using System;
using System.Web;
using System.Web.Services;
using System.Web.Services.Protocols;

using System.IO;

[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
public class Service : System.Web.Services.WebService
...{
    public Service () ...{

        //如果使用设计的组件，请取消注释以下行 
        InitializeComponent(); 
    }

    private System.Timers.Timer timer1;
    private System.ComponentModel.IContainer components;

    private void InitializeComponent()
    ...{
        this.components = new System.ComponentModel.Container();
        this.timer1 = new System.Timers.Timer();
        // 
        // timer1
        // 
        this.timer1.Enabled = true;
        this.timer1.Interval = 1000;
        this.timer1.Elapsed += new System.Timers.ElapsedEventHandler(timer1_Elapsed);
    }

    private void timer1_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
    ...{
        using (StreamWriter sw = new StreamWriter(Server.MapPath(".")+"TextFile.txt"))
        ...{
            sw.WriteLine(DateTime.Now);
        }
    }