public IPLocation ParaseString(string _content, IPLocation _iplocation)
 {
     JavaScriptSerializer j = new JavaScriptSerializer();
     IPLocation Iplocation = new IPLocation();
     Iplocation = j.Deserialize<IPLocation>(_content);
     return Iplocation;
 }
        /// <summary>
        /// 根据ipv4地址获取城市id
        /// </summary>
        /// <param name="_ip"></param>
        /// <returns></returns>
        public string getCityId(string _ip)
        {
            IPLocation iplocation = new IPLocation();
            string locationString = getLocation(_ip);
            if (locationString == null)
            {
                return null;
            }
            iplocation = ParaseString(locationString, iplocation);
            string city = iplocation.content.address_detail.city;
            string province = iplocation.content.address_detail.province;
            string districts = iplocation.content.address_detail.district;

            string cityid = GetCityId.getCityId(province, city, districts);
            return cityid;
        }