C#后台 GPS坐标转化成百度坐标

　　　　　　protected void Page_Load(object sender, EventArgs e)
　　　　　　{

 　　　　　　//获取当前纬度
            string Latitude = "117.707677";

            //获取当前经度
            string Longitude = "39.084097";
            //百度坐标转换API
            string path = "http://api.map.baidu.com/ag/coord/convert?from=0&to=4&x=" + Latitude + "&y=" + Longitude + "";

            HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(path);
            webRequest.Method = "GET";
            HttpWebResponse webResponse = (HttpWebResponse)webRequest.GetResponse();
            StreamReader sr = new StreamReader(webResponse.GetResponseStream(), Encoding.UTF8);

            string strJson = sr.ReadToEnd();

            JavaScriptSerializer js = new JavaScriptSerializer();
            MapConvert mc = js.Deserialize<MapConvert>(strJson);
            if (mc.error == "0")
            {
                string lon = mc.x;
                string lat = mc.y;

                //进行Base64解码
                byte[] xBuffer = Convert.FromBase64String(lon);
                string strX = Encoding.UTF8.GetString(xBuffer, 0, xBuffer.Length);

                byte[] yBuffer = Convert.FromBase64String(lat);
                string strY = Encoding.UTF8.GetString(yBuffer, 0, xBuffer.Length);

                string strB = strX + "," + strY;
            }
            else
            {
                string strB = "获取失败";
            }

        }

    }
    public class MapConvert
    {
        public string error { get; set; }
        public string x { get; set; }
        public string y { get; set; }
    }