取得真实客户端IP地址

string clientIP = Request.UserHostAddress;

            string userHostName = Request.UserHostName;

            if (Context.Request.ServerVariables["HTTP_VIA"] != null) // 服务器， using proxy

            {

                //得到真实的客户端地址

                clientIP = Context.Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString();  // Return real client IP.

            }

            else//如果没有使用代理服务器或者得不到客户端的ip  not using proxy or can't get the Client IP

            {

                //得到服务端的地址

                clientIP = Context.Request.ServerVariables["REMOTE_ADDR"].ToString(); //While it can't get the Client IP, it will return proxy IP.

            }