C#百度api 根据经纬度获取地址

  public string GetAddress(string lat, string lng)
         {
             try
             {
                 string res = "";

                 string url = @"http://api.map.baidu.com/geocoder/v2/?ak=ZndyfXErtTiZQwfgNgQ7yqb7ALKdk4DA&location=" + lat + "," + lng + "&output=xml";
                 WebRequest request = WebRequest.Create(url);
                 request.Method = "POST";
                 XmlDocument xmlDoc = new XmlDocument();
                 string sendData = xmlDoc.InnerXml;
                 byte[] byteArray = Encoding.Default.GetBytes(sendData);

                 Stream dataStream = request.GetRequestStream();
                 dataStream.Write(byteArray, , byteArray.Length);
                 dataStream.Close();

                 WebResponse response = request.GetResponse();
                 dataStream = response.GetResponseStream();
                 StreamReader reader = new StreamReader(dataStream, System.Text.Encoding.GetEncoding("utf-8"));
                 string responseXml = reader.ReadToEnd();

                 XmlDocument xml = new XmlDocument();
                 xml.LoadXml(responseXml);
                 string status = xml.DocumentElement.SelectSingleNode("status").InnerText;
                 if (status == "")
                 {

                     XmlNodeList nodes = xml.DocumentElement.GetElementsByTagName("formatted_address");
                     XmlNodeList nodes1 = xml.DocumentElement.GetElementsByTagName("sematic_description");
                     if (nodes.Count >  && !string.IsNullOrEmpty(nodes[].InnerText))
                     {
                         res += "地址信息: " + nodes[].InnerText;
                     }
                     if (nodes1.Count >  && !string.IsNullOrEmpty(nodes1[].InnerText))
                     {
                         res += "  结果描述: " + nodes1[].InnerText;
                     }
                     if (nodes.Count <=  && nodes1.Count <= )
                         res = "未获取到位置信息,错误码3";
                 }
                 else
                 {
                     res = "未获取到位置信息,错误码1";
                 }
                 return res;
             }
             catch (System.Exception ex)
             {
                 return "未获取到位置信息,错误码2";
             }
         }

测试连接

http://api.map.baidu.com/geocoder/v2/ak=ZndyfXErtTiZQwfgNgQ7yqb7ALKdk4DA&location=39.963175,116.400244&output=json

接口详细说明地址:http://lbsyun.baidu.com/index.php?title=webapi/guide/webservice-geocoding