取IP

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.Net.Dns.Resolve(System.Net.Dns.GetHostName()).AddressList.GetValue(0).ToString()

private string GetIP() //get local ip
  {

  IPHostEntry tempHost = new IPHostEntry();
  tempHost = Dns.Resolve(Dns.GetHostName());
  if(tempHost.AddressList.Length==1)
  {
  return tempHost.AddressList[0].ToString();
  }
  else
  {
  return tempHost.AddressList[1].ToString();
  }

// 通过外部网站返回得到内网外部IP
  // 来源: http://www.cnblogs.com/helloworl ... 5/08/18/218104.html

  using System;
  using System.IO;
  using System.Net;
  using System.Text;
  using System.Text.RegularExpressions;

  class PubIP
  {
   static string GetIP()
   {
      Uri                         uri = new Uri("http://www.ikaka.com/ip/index.asp");
      HttpWebRequest    req = (HttpWebRequest)WebRequest.Create(uri);
      req.Method                   = "POST";
      req.ContentType          = "application/x-www-form-urlencoded";
      req.ContentLength    = 0;
      req.CookieContainer = new CookieContainer();
      req.GetRequestStream().Write(new byte [0], 0, 0);
      HttpWebResponse res = (HttpWebResponse)(req.GetResponse());
      StreamReader       rs    = new StreamReader(res.GetResponseStream(), Encoding.GetEncoding("GB18030"));
      string                   s    = rs.ReadToEnd();
      rs.Close();
      req.Abort();
      res.Close();
      Match m = Regex.Match(s, @"IP：/[(?<IP>[0-9/.]*)/]");
      if (m.Success) return m.Groups["IP"].Value;
      return string.Empty;
   }

   static void Main()
   {
      Console.WriteLine(GetIP());
   }
  }

MachineName = System.Net.Dns.GetHostName();
  System.Net.IPAddress addr;
  // 获得本机局域网IP地址
  addr = new System.Net.IPAddress(Dns.GetHostByName(Dns.GetHostName()).AddressList[0].Address);
  IpAddress = addr.ToString();

using System;
  using System.Drawing;
  using System.Collections;
  using System.ComponentModel;
  using System.Windows.Forms;
  using System.Data;
  using System.Management;
  using System.Net;
  using System.Net.Sockets ;

  private void button1_Click(object sender, System.EventArgs e)
  {
  string s="",mac="";
  //利用DNS组件的GetHostName函数读取机器名
  string hostInfo=Dns.GetHostName();
  //读取IP地址列表
  System.Net.IPAddress [] addressList=Dns.GetHostByName(Dns.GetHostName()).AddressList;
  for(int i=0;i<addressList.Length;i++)
  {
  s+=":" + addressList.ToString();
  }
  //利用ManagementClass类取得MAC地址
  ManagementClass mc;
                        mc=new ManagementClass("Win32_NetworkAdapterConfiguration");
  ManagementObjectCollection moc=mc.GetInstances();
  foreach(ManagementObject mo in moc)
  {
  if (mo ["IPEnabled"].ToString ()=="True")
  mac=mo["MacAddress"].ToString();
  }
                        //在广本编辑框中显示数据
               ComputerName.Text=hostInfo;
  IpAdd.Text=s;
  MacAdd.Text=mac;
  }

http://topic.csdn.net/t/20050927/13/4296901.html