ASP.NET 抓ip的方法

抓ip的方法 

判所 client 端是否有設定代理伺服器 

Request.ServerVariables["HTTP_VIA"] 

取得 client端 ip

Request.ServerVariables["REMOTE_ADDR"] 

=================================================================================== 

  string clientIP = GetClientIP();

        /// <summary>
        /// 取得正確的Client端IP
        /// </summary>
        /// <returns></returns>
        protected string GetClientIP()
        {
            //判所client端是否有設定代理伺服器
            if (Request.ServerVariables["HTTP_VIA"] == null)   
                return Request.ServerVariables["REMOTE_ADDR"].ToString();
            else
                return Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString();  
        }

=================================================================================== 

private static string RetrieveIP(HttpRequest request)
        {
            string ip = request.ServerVariables["HTTP_X_FORWARDED_FOR"];
            if (ip == null || ip.Trim() == string.Empty)
            {
                ip = request.ServerVariables["REMOTE_ADDR"];
            }
            return ip;
        }