asp.net 获取客户端浏览器访问的IP地址的实例代码_实用技巧_

 #region IP地址限制功能 2017-07-18 /// 
 /// /// 
 ///  public bool IsIPValidate() { bool flag = false; string userip = GetLoginIp(); string[] addr = GetAddressByIp(userip); string addrs = addr[0] + addr[1]; if ("北京".Equals(addr[0]) || "北京".Equals(addr[1])) { flag = true; } return flag; } /// 
 /// 获取远程访问用户的Ip地址 /// 
 /// 返回Ip地址 protected string GetLoginIp() { string loginip = ""; //Request.ServerVariables[""]--获取服务变量集合 if (Request.ServerVariables["REMOTE_ADDR"] != null) //判断发出请求的远程主机的ip地址是否为空 { //获取发出请求的远程主机的Ip地址 loginip = Request.ServerVariables["REMOTE_ADDR"].ToString(); } //判断登记用户是否使用设置代理 else if (Request.ServerVariables["HTTP_VIA"] != null) { if (Request.ServerVariables["HTTP_X_FORWARDED_FOR"] != null) { //获取代理的服务器Ip地址 loginip = Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString(); } else { //获取客户端IP loginip = Request.UserHostAddress; } } else { //获取客户端IP loginip = Request.UserHostAddress; } return loginip; } /// 
 /// 根据IP获取省市 /// 
 public string[] GetAddressByIp(string ip) { 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=1t115.193.210.0t115.194.201.255t中国t浙江t杭州t电信 string[] arr = getAreaInfoList(res); return arr; } /// 
 /// Post请求数据 /// 
 ///  ///  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; } /// 
 /// 处理所要的数据 /// 
 ///  ///  public static string[] getAreaInfoList(string ipData) { //1t115.193.210.0t115.194.201.255t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) { } return newAreaArr; } #endregion