ASP.NET 定时执行一段代码 Global.asax

在Global.asax启动一条线程就ok了，下面是启动线程定时写文件的例子
在Global.asax
C# code:
<%@ Application Language="C#" %>
<%@ Import Namespace="System.IO" %>
<%@ Import Namespace="System.Threading" %>
<script runat="server">   
 string LogPath;   
Thread thread;   
void WriteLog()  { 
       while (true)       
      {           
                   StreamWriter sw = new StreamWriter(LogPath, true, Encoding.UTF8);         
                   sw.WriteLine(thread.Name + ":" + DateTime.Now.ToString());        
                   sw.Close();        
                    Thread.CurrentThread.Join(1000 * 60);//阻止1分钟       
      }   
 } 
  void Application_Start(object sender, EventArgs e) {    
       LogPath = HttpContext.Current.Server.MapPath("log.txt");   
      //在应用程序启动时运行的代码    
      thread = new Thread(new ThreadStart(WriteLog));       
      thread.Name = "写登录日志线程";      
      thr