asp.net 通过获取IP地址 查询地理位置

[lookauto]

帮忙详细解释这段代码的意思

private string m_Location = "", m_IpAddress = "", m_Response = "";

		/// <summary>
		/// 新建IpLocation实例以获得IP地理位置
		/// </summary>
		/// <param name="ipAddress"></param>
		public IpLocation(string ipAddress)
		{
			m_IpAddress = ipAddress.Trim();

			string[] ip = ipAddress.Split('.');

			ipAddress = ip[0] + "." + ip[1] + ".1.1";

			WebClient client = new WebClient();
			client.Encoding = System.Text.Encoding.GetEncoding("GB2312");

			string url = "http://www.ip138.com/ips.asp";
			string post = "ip=" + ipAddress + "&action=2";
			client.Headers.Set("Content-Type", "application/x-www-form-urlencoded");         //尤其是这一句
			string response = client.UploadString(url, post);                                 //这里
			m_Response = response;                                                               

			string p = @"<li>参考数据二：(?<location>[^<>]+?)</li>";                         //和这一句

			Match match = Regex.Match(response, p);                                           //还有这里
			m_Location = match.Groups["location"].Value.Trim();                                 //和这里
		}

		/// <summary>
		/// 返回Ip地址的地理位置名称
		/// </summary>
		public string Location
		{
			get
			{
				return m_Location;
			}
		}

		public string IpAddress
		{
			get
			{
				return m_IpAddress;
			}
		}

		/// <summary>
		/// 返回网络反馈原始数据
		/// </summary>
		public string Response
		{
			get
			{
				return m_Response;
			}
		}

[cppfaq]

拿分走人：）

// 指定表单向服务器提交的编码类型,默认就上这个
            client.Headers.Set("Content-Type", "application/x-www-form-urlencoded");         //尤其是这一句

            // 向"http://www.ip138.com/ips.asp";页面post数据
            string response = client.UploadString(url, post);                                 //这里
            m_Response = response;

            // 用于解析结果的正则表达式
            string p = @"<li>参考数据二：(?<location>[^<>]+?)</li>";                         //和这一句

            // 正则解析网页的返回内容
            Match match = Regex.Match(response, p);                                           //还有这里
            
            // 取出匹配内容
            m_Location = match.Groups["location"].Value.Trim();                                 //和这里

[百思软件工作室]

学习中...

[ssssslym]

xue xi

[lindardeng]

抓取了一个根据IP取得地址的页面内容，然后用正则匹配出地址