网络编程示例（一）

using System;
using System.Collections.Generic;
using System .Net ;
using System .Net .Sockets ;
using System.Text .RegularExpressions;

namespace NetWork
{
    class NetWork
    {
        public static void Main(string[] args)
        {
//          
            string[]   slist     =   {"12.123.23.4","12.23.*.56","23.34.*.*","12.23.3*.1"};
             Regex   rg   =   new   Regex(@"^(\d{1,3}|\*)\.(\d{1,3}|\*)\.(\d{1,3}|\*)\.(\d{1,3}|\*)$");   
//           foreach   (string   s   in   slist)   
//           Console.WriteLine("{0}:{1}",   s,   rg.IsMatch(s));   

            Console.WriteLine("Input HostName!");
            string pHostName=Console.ReadLine ();
            IPHostEntry myAddress=Dns.GetHostByName(pHostName);
            Console.WriteLine ("{0} IP Address is ",pHostName);
            IPAddress[] myIpAddress=myAddress.AddressList;
            foreach(IPAddress ip in myIpAddress)
            {
                Console.WriteLine (ip);
            }
            string pAddress=Console.ReadLine ();
            do
            {
            
             if(rg.IsMatch (pAddress))
             {
               IPHostEntry myHostName=Dns.GetHostByAddress(pAddress);
               Console.WriteLine ("{0}对应的主机名{1}:",pAddress,myHostName.HostName.ToString ());
             }
            else
            {
                Console.WriteLine ("IP 格式不对");
            }
             pAddress=Console.ReadLine ();
            }while(!pAddress.Equals("0"));
            
        }
    }
}