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   源码介绍

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适合新手学习，获取主机名 ip 以及扫描局域网IP

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.Sockets;
using System.Net.NetworkInformation;

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

        private void button1_Click(object sender, EventArgs e)
        {
            string name = Dns.GetHostName();
            textBox1.Text = name;
            IPAddress[] ipads = Dns.GetHostAddresses(name);
            foreach(IPAddress ip in ipads)
            {
                if (ip.AddressFamily == AddressFamily.InterNetwork)
                {
                    textBox2.Text = ip.ToString();
                }
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            if (textBox2.Text.Split(new string[] { "." }, StringSplitOptions.RemoveEmptyEntries).Count() < 4) {
                MessageBox.Show("请获取本地ip后再扫描");
                return;
            }
            for (int i = 0; i < 255; i  )
            {
                Ping p;
                p = new Ping();
                p.PingCompleted  =new PingCompletedEventHandler(p_PingCompleted);

                //string pip = "120.40.53."   i.ToString();
                string pip = string.Join(".", textBox2.Text.Split(new string[] { "." }, StringSplitOptions.RemoveEmptyEntries).Take(3).ToArray()) "." i.ToString();
                p.SendAsync(pip,2000,null);
            }
        }
        private void p_PingCompleted(object sender,PingCompletedEventArgs e)
        {
 if(e.Reply.Status==IPStatus.Success)
 {
     listBox1.Items.Add(e.Reply.Address.ToString());
 }
        }
    }
}