///<summary>        

/// 判断是否是Ip地址        

/// </summary>        

/// <param name="str1"></param>        

/// <returns></returns>

        public static bool IsIPAddress(string ip)         {

            if (string.IsNullOrEmpty(ip) || ip.Length < 7 || ip.Length > 15) return false;

            string regformat = @"^(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])$";

            Regex regex = new Regex(regformat, RegexOptions.IgnoreCase);

            return regex.IsMatch(ip);

        }

 public static bool IsIPPort(string port)        

{            

bool isPort = false;            

int portNum;            

isPort = Int32.TryParse(port, out portNum);            

if (isPort && portNum >= 0 && portNum <= 65535)            

{                

isPort = true;            

}            

else            

{                

isPort = false;            

}

            return isPort;         }