遍历Request.QueryString的所有参数与值

应用在Pager控件中：

string sQueryString = "";
   for (int i = 0; i < Request.QueryString.Count; i++)
   {
    if (Request.QueryString.Keys[i].ToString().ToLower() != "page") {
     sQueryString += Request.QueryString.Keys[i].ToString() + "=" + Request.QueryString[i].ToString() + "&";
    }
   }
   if (sQueryString != "")
   {
    sQueryString = "?" + sQueryString + "page=";
   }
   else {
    sQueryString = "?page=";
   }
   return Request.Url.AbsolutePath + sQueryString;