/// <summary>        /// 根据坐标点获取驾车距离        /// </summary>        /// <param name="origins">起点坐标</param>        /// <param name="destinations">终点坐标</param>        /// <returns></returns>        public static string GetDistance(string origins, string destinations)        {            try            {                //测试数据                origins = "22.823331,108.326998";                destinations = "22.832541,108.321788|22.83841,108.294974|22.817868,108.425637|22.883959,108.305368|22.83334,108.32637";                //行车距离                string url = "http://api.map.baidu.com/routematrix/v2/driving";                string ak = "595eRciHjA0MG4TmhTm5ak58M00bQand";                string param = string.Format("origins={0}&destinations={1}&output=json&ak={2}", origins, destinations, ak);                string strURL = url + ‘?‘ + param;                System.Net.HttpWebRequest request;                request = (System.Net.HttpWebRequest)WebRequest.Create(strURL);                request.Method = "GET";                System.Net.HttpWebResponse response;                response = (System.Net.HttpWebResponse)request.GetResponse();                System.IO.Stream s;                s = response.GetResponseStream();                string StrDate = "";                string strValuehttp://www.mamicode.com/= "";                StreamReader Reader = new StreamReader(s, Encoding.UTF8);                while ((StrDate = Reader.ReadLine()) != null)                {                    strValue += StrDate + "\r\n";                }                return strValue;            }            catch (Exception)            {            }            return "";        }