C# 根据IP获取省市

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/// <summary>        /// 根据IP获取省市        /// </summary>        public void GetAddressByIp()        {            string ip = "115.193.217.249";            string PostUrl = "http://int.dpool.sina.com.cn/iplookup/iplookup.php?ip=" + ip;            string res = GetDataByPost(PostUrl);//该条请求返回的数据为:res=1\t115.193.210.0\t115.194.201.255\t中国\t浙江\t杭州\t电信            string[] arr = getAreaInfoList(res);        }        /// <summary>        /// Post请求数据        /// </summary>        /// <param name="url"></param>        /// <returns></returns>        public string GetDataByPost(string url)        {            HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);            string s = "anything";            byte[] requestBytes = System.Text.Encoding.ASCII.GetBytes(s);            req.Method = "POST";            req.ContentType = "application/x-www-form-urlencoded";            req.ContentLength = requestBytes.Length;            Stream requestStream = req.GetRequestStream();            requestStream.Write(requestBytes, 0, requestBytes.Length);            requestStream.Close();            HttpWebResponse res = (HttpWebResponse)req.GetResponse();            StreamReader sr = new StreamReader(res.GetResponseStream(), System.Text.Encoding.Default);            string backstr = sr.ReadToEnd();            sr.Close();            res.Close();            return backstr;        }        /// <summary>        /// 处理所要的数据        /// </summary>        /// <param name="ip"></param>        /// <returns></returns>        public static string[] getAreaInfoList(string ipData)        {            //1\t115.193.210.0\t115.194.201.255\t中国\t浙江\t杭州\t电信            string[] areaArr = new string[10];            string[] newAreaArr = new string[2];            try            {                //取所要的数据,这里只取省市                areaArr = ipData.Split('\t');                newAreaArr[0] = areaArr[4];//省                newAreaArr[1] = areaArr[5];//市            }            catch (Exception e)            {                // TODO: handle exception            }            return newAreaArr;        }

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