通过GoogleMap将地址转换为经纬度

        /// <summary>
        /// 根据地址获取经度和纬度
        /// </summary>
        /// <returns></returns>
        public static string GetlatlngByAddress(string address)
        {
            string latlng = string.Empty;
            try
            {
                address = HttpUtility.UrlEncode(address, Encoding.UTF8);
                result = WebContent.GetDataFromUrl("http://maps.google.com/maps/geo?q=" + address + "&output=xml&sensor=true&key=dc27b1d958ee7725aa1b6899af7b50816258da9bf3ffa0f736db1bf3ca24877b7a25104e7f587e1c");
                XmlDocument xml = new XmlDocument();
                xml.LoadXml(latlng);

                latlng = GetXMLValue(xml, "Response/Placemark/Point/coordinates");

            }
            catch
            {

            }
            return latlng;
        }