WebHelper

/// <summary> /// 获取web客户端ip /// </summary> /// <returns></returns> public static string GetWebClientIp()
        { try { if (HttpContext.Current == null || HttpContext.Current.Request == null || HttpContext.Current.Request.ServerVariables == null) return ""; string CustomerIP = ""; //CDN加速后取到的IP CustomerIP = HttpContext.Current.Request.Headers["Cdn-Src-Ip"]; if (!string.IsNullOrEmpty(CustomerIP))
                { return CustomerIP;
                } if (HttpContext.Current.Request.ServerVariables["HTTP_VIA"] != null)
                {
                    CustomerIP = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"]; if (CustomerIP == null)
                        CustomerIP = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
                } else {
                    CustomerIP = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];

                } if (string.Compare(CustomerIP, "unknown", true) == 0) return HttpContext.Current.Request.UserHostAddress; return CustomerIP; /** lcq
                关键就在HTTP_X_FORWARDED_FOR
                使用不同种类代理服务器，上面的信息会有所不同：

                一、没有使用代理服务器的情况：
                REMOTE_ADDR = 您的 IP
                HTTP_VIA = 没数值或不显示
                HTTP_X_FORWARDED_FOR = 没数值或不显示

                二、使用透明代理服务器的情况：Transparent Proxies
                REMOTE_ADDR = 代理服务器 IP 
                HTTP_VIA = 代理服务器 IP
                HTTP_X_FORWARDED_FOR = 您的真实 IP
                这类代理服务器还是将您的信息转发给您的访问对象，无法达到隐藏真实身份的目的。

                三、使用普通匿名代理服务器的情况：Anonymous Proxies
                REMOTE_ADDR = 代理服务器 IP 
                HTTP_VIA = 代理服务器 IP
                HTTP_X_FORWARDED_FOR = 代理服务器 IP
                隐藏了您的真实IP，但是向访问对象透露了您是使用代理服务器访问他们的。

                四、使用欺骗性代理服务器的情况：Distorting Proxies
                REMOTE_ADDR = 代理服务器 IP 
                HTTP_VIA = 代理服务器 IP 
                HTTP_X_FORWARDED_FOR = 随机的 IP
                告诉了访问对象您使用了代理服务器，但编造了一个虚假的随机IP代替您的真实IP欺骗它。

                五、使用高匿名代理服务器的情况：High Anonymity Proxies (Elite proxies)
                REMOTE_ADDR = 代理服务器 IP
                HTTP_VIA = 没数值或不显示
                HTTP_X_FORWARDED_FOR = 没数值或不显示 
                **/ } catch (Exception)
            { return string.Empty;
            }
        } /// <summary> /// 获取服务器IP /// </summary> /// <returns></returns> public static string GetLocalIp()
        { try { var ipHostEntry = Dns.GetHostEntry(Dns.GetHostName()); var address = ipHostEntry.AddressList.FirstOrDefault(i => i.AddressFamily == AddressFamily.InterNetwork); var localIpAddress = address == null ? string.Empty : address.ToString(); return localIpAddress;
            } catch (Exception)
            { return string.Empty;
            }  
        }