C# 获取局域网IP和MAC地址

C#遍历局域网的几种方法及比较
2009-07-03 10:08

扫描局域网IP列表的几种方法 很多软件都有获知局域网在线计算机IP的功能，但是在.net怎么实现呢，有好多方法， 下面我给大家介绍几种，供大家参考。 1、微软社区上介绍了使用Active Directory 来遍历局域网 利用DirectoryEntry组件来查看网络 网址：http://www.microsoft.com/china/communITy/program/originalarticles/techdoc/DirectoryEntry.mspx private void EnumComputers() { using(DirectoryEntry root = new DirectoryEntry("WinNT:")) { foreach(DirectoryEntry domain in root.Children) { Console.WriteLine("Domain | WorkGroup: "+domain.Name); foreach(DirectoryEntry computer in domain.Children) { Console.WriteLine("Computer: "+computer.Name); } } } } 效果评价：速度慢，效率低，还有一个无效结果 Computer: Schema 使用的过程中注意虑掉。 2、利用Dns.GetHostByAddress和IPHostEntry遍历局域网 private void EnumComputers() { for (int i = 1; i <= 255; i++) { string scanIP = "192.168.0." + i.ToString(); IPAddress myScanIP = IPAddress.Parse(scanIP); IPHostEntry myScanHost = null; try { myScanHost = Dns.GetHostByAddress(myScanIP); } catch { continue; } if (myScanHost != null) { Console.WriteLine(scanIP+"|"+myScanHost.HostName); } } } 效果评价：效率低，速度慢，不是一般的慢。 3、使用System.Net.NetworkInformation.Ping来遍历局域网 private void EnumComputers() { try { for (int i = 1; i <= 255; i++) { Ping myPing; myPing = new Ping(); myPing.PingCompleted += new PingCompletedEventHandler(_myPing_PingCompleted); string pingIP = "192.168.0." + i.ToString(); myPing.SendAsync(pingIP, 1000, null); } } catch { } } PRIVATE void _myPing_PingCompleted(object sender, PingCompletedEventArgs e) { if (e.Reply.Status == IPStatus.Success) { Console.WriteLine(e.Reply.Address.ToString() + "|" + Dns.GetHostByAddress(IPAddress.Parse(e.Reply.Address.ToString())).HostName); } } 效果评价：速度快，效率高，如果只取在线的IP，不取计算机名，速度会更快。 需要注意的是取计算机名称如果用Dns.GetHostByAddress取计算机名称，结果虽然正确，但VS2005会提示该方法已过时，但仍能使用。 如果用它推荐的替代方法Dns.GetHostEntry，则有个别计算机的名称会因超时而获得不到。 获取局域网内的IP和MAC地址代码如下： using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.Runtime.InteropServices; using System.Net; using System.Net.NetworkInformation; namespace MacApp { public partial class Form1 : Form { [DllImport("ws2_32.dll")] private static extern int inet_addr(string cp); [DllImport("IPHLPAPI.dll")] private static extern int SendARP(Int32 DestIP, Int32 SrcIP, ref Int64 pMacAddr, ref Int32 PhyAddrLen); public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { richTextBox1.Text = GetMacAddress(textBox1.Text);//获取远程IP（不能跨网段）的MAC地址 } private string GetMacAddress(string hostip)//获取远程IP（不能跨网段）的MAC地址 { string Mac = ""; try { Int32 ldest = inet_addr(hostip); //将IP地址从 点数格式转换成无符号长整型 Int64 macinfo = new Int64(); Int32 len = 6; SendARP(ldest, 0, ref macinfo, ref len); string TmpMac = Convert.ToString(macinfo, 16).PadLeft(12, '0');//转换成16进制　　注意有些没有十二位 Mac = TmpMac.Substring(0, 2).ToUpper();// for (int i = 2; i < TmpMac.Length; i = i + 2) { Mac = TmpMac.Substring(i, 2).ToUpper() + "-" + Mac; } } catch (Exception Mye) { Mac = "获取远程主机的MAC错误：" + Mye.Message; } return Mac; } private void Form1_Load(object sender, EventArgs e) { if (Dns.GetHostEntry(Dns.GetHostName()).AddressList.Length > 0) { textBox1.Text = Dns.GetHostEntry(Dns.GetHostName()).AddressList[0].ToString();//获取本机IP地址 } } private void button2_Click(object sender, EventArgs e) { StringBuilder sb = new StringBuilder(); for (int i = 0; i < 2; i++) { EnumComputers(i); } } private void EnumComputers(int n) { try { for (int i = 1; i <= 255; i++) { Ping myPing; myPing = new Ping(); myPing.PingCompleted += new PingCompletedEventHandler(myPing_PingCompleted); string pingIP = "192.168." + n.ToString() + "." + i.ToString(); myPing.SendAsync(pingIP, 1000, null); } } catch (Exception ex) { MessageBox.Show(ex.Message); } } private void myPing_PingCompleted(object sender, PingCompletedEventArgs e) { StringBuilder sb = new StringBuilder(); if (e.Reply.Status == IPStatus.Success) { sb.Append("IP:" + e.Reply.Address.ToString() + "/r/n"); string mac = GetMacAddress(e.Reply.Address.ToString()); sb.Append("MAC:" + mac + "/r/n"); } this.textBox2.Text += sb.ToString(); } } }

C#的本机IP地址

IPHostEntry IpEntry = Dns.GetHostEntry(Dns.GetHostName());
string myip = IpEntry.AddressList[0].ToString();

这样,如果没有安装IPV6协议,可以取得IP地址. 但是如果安装了IPV6,就取得的是IPV6的IP地址.

string myip = IpEntry.AddressList[1].ToString();
这样就在IPV6的情况下取得IPV4的IP地址.

但是,如果本机有很多块网卡, 如何得到IpEntry.AddressList[多少]才是本机的局网IPV4地址呢?