httphandler配合URLRewrite做url参数隐藏

global.asax.cs文件         protected void Application_BeginRequest(Object sender, EventArgs e)          {               try               {                    string path=Server.MapPath("~/ReWriter.config");                    XPathDocument myXPathDocument = new XPathDocument(path);                    XPathNavigator myXPathNavigator = myXPathDocument.CreateNavigator();                      XPathNodeIterator myXPathNodeIterator =  myXPathNavigator.Select ("//rule");                    System.Text.RegularExpressions.Regex oReg;                    string ReWriteUrl;                      while (myXPathNodeIterator.MoveNext())                    {                        //oReg=new Regex(oNode.SelectSingleNode("url/text()").Value);                        XPathNavigator nav2 = myXPathNodeIterator.Current.Clone();                        string oldString="",newString="";                        XPathNodeIterator it2 = nav2.Select("old");                        while(it2.MoveNext())                        {                             oldString = it2.Current.Value;                             break;                        }                        it2 = nav2.Select("new");                        while(it2.MoveNext())                        {                             newString = it2.Current.Value;                             break;                        }                        if(oldString != "" &&  newString != "")                        {                                  oReg = new System.Text.RegularExpressions.Regex(oldString);                                  if(oReg.IsMatch(Request.Url.ToString()))                                  {                                      ReWriteUrl = oReg.Replace(Request.Url.ToString(),newString);                                      HttpContext.Current.RewritePath(ReWriteUrl);                                      break;                                  }                        }                    }                                  }               catch               {               }            } ReWriter.config内容(配制ReWriter信息)                          (.*)/TestUrlRe/file(.*)/(.*)/.html                ../WebForm1.aspx?id=$2&type=$3                                    (.*)/TestUrlRe/t(.*)/(.*)/.html                ../WebForm1.aspx?tid=$2&ttype=$3