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   源码介绍

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.Net.NetworkInformation;

namespace IP
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            this.timer1.Start();
        }
        List<string> ipList = new List<string>();
        public void getIP()
        {

            //获取本地机器名  
            string _myHostName = Dns.GetHostName();
            //获取本机IP  
            string _myHostIP = Dns.GetHostEntry(_myHostName).AddressList[0].ToString();
            //截取IP网段 
            string ipDuan = _myHostIP.Remove(_myHostIP.LastIndexOf('.'));
            //枚举网段计算机 
            try
            {
                for (int i = 1; i <= 255; i  )
                {
                    Ping myPing = new Ping();
                    myPing.PingCompleted  = new PingCompletedEventHandler(_myPing_PingCompleted);
                    string pingIP = ipDuan   "."   i.ToString();
                    myPing.SendAsync(pingIP, 10000, null);

                }
            }
            catch(PingException e)
            {
                timer1.Stop();
                MessageBox.Show(e.ToString());
                
            }
        }
        void _myPing_PingCompleted(object sender, PingCompletedEventArgs e)
        {
            if (e.Reply.Status == IPStatus.Success)
            {
                if (!ipList.Contains(e.Reply.Address.ToString()))
                {
                    ipList.Add(e.Reply.Address.ToString());
                    this.listBox1.Items.Add(e.Reply.Address.ToString());
                }
            }
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            getIP();
        }  

    }
}