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¼ÙÈçÎÒÃÇÓÐÕâÑùµÄXmlÊý¾ÝÎļþCatalog.xml:
<Navigation>
      <Catalog title="·Ç¼¼ÊõÇø" url="default.aspx?cate=2" rss="MainFeed.aspx?cate=2" visible="true"  cate="2"/>
      <Catalog title="×ªÔØÇø" url="default.aspx?cate=7" rss="MainFeed.aspx?cate=7"  visible="true"  cate="7"/>
</Navigation>ͨ¹ýDataTable.Select²éѯXmlÊý¾ÝµÄ·½·¨ÊÇ:
DataSet myds=new DataSet();
myds.ReadXml(Server.MapPath("Catalog.xml"));
if(Request.QueryString["cate"]!=null)
          {
                querystr="cate="+Request.QueryString["cate"];
          }
                      
 DataRow[] row=myds.Tables[0].Select(querystr);
 if(row.Length>0)
          {
                url=row[0]["url"].ToString();
          }
           
Ò»¿ªÊ¼ÎÒÓÃÉÏÃæµÄ·½·¨²éѯÄܵÃÕýÈ·µÄ½á¹û£¬µ«µ±Catalog.xmlij¸ö½ÚµãµÄcate>10ʱ£¬±ÈÈçcate=10, ͨ¹ýmyds.Tables[0].Select("cate=10")¾Í²éѯ²»µ½cate=10µÄ½Úµã¡£Ò»¿ªÊ¼°Ù˼²»µÃÆä½â, ÒòΪÎÒÈÏΪcateÔÚmydsÖÐÊDZ»×÷ΪintÀàÐÍ´¦ÀíµÄ¡£ºóÀ´£¬ÎÒÏëµ½ÊDz»Êǵ±cate±ä³ÉÁ½Î»Êýʱ, DataSet°Ñcate×÷Ϊ×Ö·û´®´¦Àí?ÎÒ½«´úÂë¸Ä³É:
    querystr="cate='"+Request.QueryString["cate"]+"'";
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