C# 获取IP和MAC地址

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();

}

}

}