获取系统相关因素值

     public string UserHostAddress
        {
            get
            {
                return HttpContext.Current.Request.UserHostAddress;
            }
        }
        public string IPV4
        {
            get
            {
                string result = "0.0.0.0";
                IPAddress[] hostAddresses = Dns.GetHostAddresses(Dns.GetHostName());
                IPAddress[] array = hostAddresses;
                for (int i = 0; i < array.Length; i++)
                {
                    IPAddress iPAddress = array[i];
                    if (iPAddress.AddressFamily == AddressFamily.InterNetwork)
                    {
                        result = iPAddress.ToString();
                    }
                }
                return result;
            }
        }
        public string UserHostName
        {
            get
            {
                return Dns.GetHostEntry(HttpContext.Current.Request.UserHostAddress).HostName;
            }
        }
        public string UserAgent
        {
            get
            {
                return HttpContext.Current.Request.UserAgent;
            }
        }
        public string LogonUser
        {
            get
            {
                return HttpContext.Current.Request.ServerVariables["LOGON_USER"].ToString();
            }
        }
        public string ServerName
        {
            get
            {
                return HttpContext.Current.Request.ServerVariables["SERVER_NAME"].ToString();
            }
        }
        public string ServerPort
        {
            get
            {
                return HttpContext.Current.Request.ServerVariables["SERVER_PORT"].ToString();
            }
        }
        public string FilePath
        {
            get
            {
                return HttpContext.Current.Request.FilePath;
            }
        }