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, 0, 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 == "0")
                {

                    XmlNodeList nodes = xml.DocumentElement.GetElementsByTagName("formatted_address");
                    XmlNodeList nodes1 = xml.DocumentElement.GetElementsByTagName("sematic_description");
                    if (nodes.Count > 0 && !string.IsNullOrEmpty(nodes[0].InnerText))
                    {
                        res += "地址信息: " + nodes[0].InnerText;
                    }
                    if (nodes1.Count > 0 && !string.IsNullOrEmpty(nodes1[0].InnerText))
                    {
                        res += "  结果描述: " + nodes1[0].InnerText;
                    }
                    if (nodes.Count <= 0 && nodes1.Count <= 0)
                        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