/// <summary> 
/// 获取IP地址 
/// </summary> 
     public static string IPAddress 
     { 
         get 
         { 
             string userIP; 
             HttpRequest Request = HttpContext.Current.Request;
             // 如果使用代理，获取真实IP 
             if (Request.ServerVariables["HTTP_X_FORWARDED_FOR"] != "") 
                 userIP = Request.ServerVariables["REMOTE_ADDR"]; 
             else 
                 userIP = Request.ServerVariables["HTTP_X_FORWARDED_FOR"]; 
             if (userIP == null || userIP == "") 
                 userIP = Request.UserHostAddress; 
             return userIP; 
         } 
     }