有的时候需要根据MAC来限定登录的计算机，为此查找了不少资料（有来自博客堂和CSDN），下面是获得远程计算机的MAC和局域网中计算机列表的方法。

using System;

using System.Collections;

using System.Diagnostics;

using System.Management;

using System.Net;

using System.DirectoryServices;

using System.Runtime.InteropServices;

using System.Text.RegularExpressions;

获得本机的MAC地址

        public static string GetLocalMac()

        {

            string strMac = string.Empty;

            ManagementClass mc = new ManagementClass("Win32_NetworkAdapterConfiguration");

            ManagementObjectCollection moc = mc.GetInstances();

            foreach(ManagementObject mo in moc)

            {

                if ((bool)mo["IPEnabled"] == true)

                    strMac += mo["MacAddress"].ToString() ;

  

            }

            return strMac.ToUpper();

        }

获得远程计算机的MAC地址

方法一：使用API，利用ARP协议，只能获得同网段计算机的MAC

        [DllImport("Iphlpapi.dll")]

        private static extern int SendARP(Int32 dest,Int32 host,ref Int64 mac,ref Int32 length);

        [DllImport("Ws2_32.dll")]

        private static extern Int32 inet_addr(string ip);

        public static string GetRemoteMac(string clientIP)

        {

            string ip = clientIP;

            if ( ip == "127.0.0.1")

                ip = GetLocalIP()[0];

            Int32 ldest=inet_addr(ip);

            Int64 macinfo=new Int64();

            Int32 len=6;

            try

            {

                SendARP(ldest,0,ref macinfo,ref len);

            }

            catch

            {

                return "";

            }

            string originalMACAddress = Convert.ToString(macinfo,16);