asp.net读取xml接口

　　    //发送获取xml请求
        public static string SentRequest(String url)
        {
            HttpWebRequest req = WebRequest.CreateHttp(url);
            req.Method = "GET";
            HttpWebResponse resp = req.GetResponse() as HttpWebResponse;
            Stream stream = resp.GetResponseStream();
            StreamReader reader = new StreamReader(stream, Encoding.GetEncoding(resp.CharacterSet));
            String json = reader.ReadToEnd();
            stream.Close();
            return json;
        }　　　　 //获取xml转化格式
　　　　 public static string GetXmlStr(string url)
        {
            string jsonstr = SentRequest(url);

            string json1 = jsonstr.Replace("&lt;", "<");
            string json2 = json1.Replace("&gt;", ">");

            return json2;
        }　　　　

　　　　string strXml = WebService.GetXmlStr(url);
　　　　List<Model> ls = new List<Model>();
　　　　if (strXml.Contains("系统标识错误"))
       {
           ls = null;
       }
       else
       {
           XmlDocument xx = new XmlDocument();
           xx.LoadXml(strXml);

           XmlNodeList xxlist = xx.GetElementsByTagName("xkxx");

           foreach (XmlNode xxNode in xxlist)
           {
               Model model = new Model();

               XmlNodeList childlist = xxNode.ChildNodes;

               model .name= childlist[0].InnerText;

               ls.Add(model);
           }

           ViewBag.UserModel= ls;
      }