根据经度和纬度返回地理位置 LocationAPi

publicclass LocationAPI
    {
        privatestaticstring GeoCodeUrl = ConfigurationManager.AppSettings["GeoCodeUrl"];
        privatestaticstring GoogleGearUrl = ConfigurationManager.AppSettings["GoogleGearUrl"];
        privatestaticstring UseGoogleReverse = ConfigurationManager.AppSettings["UseGoogleReverse"];

        ///<summary>
        /// Initializes a new instance of the <see cref="LocationAPI"/> class.
        ///</summary>
public LocationAPI()
        {

        }

        publicstaticstring GetAddressFromLL(string Lat, string Lng)
        {

            string url ="http://ws.geonames.org/findNearestAddress?lat="+ Lat +"&lng="+ Lng;
            WebResponse response =null;
            Stream stream =null;
            StreamReader reader =null;

            try
            {
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
                request.UserAgent =@"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.40607; .NET CLR 1.1.4322)";
                request.Timeout =1;
                response = request.GetResponse();
                stream = response.GetResponseStream();
                reader =new StreamReader(stream, System.Text.Encoding.UTF8);
                XmlDocument xDoc =new XmlDocument();
                xDoc.Load(stream);
                XmlNode xStreet = xDoc.SelectSingleNode("geonames/address/street");
                XmlNode xStreetNumber = xDoc.SelectSingleNode("geonames/address/streetNumber");
                XmlNode xPlacename = xDoc.SelectSingleNode("geonames/address/placename");
                XmlNode xCountryCode = xDoc.SelectSingleNode("geonames/address/countryCode");
                string address = xStreet.InnerText +""+ xStreetNumber.InnerText +", "+ xPlacename.InnerText +", "+ xCountryCode.InnerText +"";
                return address;

            }
            catch(Exception ex)
            {
                DAL.Log.Write(DateTime.Now.ToString() +"\0"+ ex.Message.ToString() +"\r\n");
                return"UnKnown";
            }
            finally
            {
                if (reader !=null) reader.Close();
                if (stream !=null) stream.Close();
                if (response !=null) response.Close();
            }
        }
    }