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。

需要引用的命名空间

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);

            if (originalMACAddress.Length<12)

            {

                originalMACAddress = originalMACAddress.PadLeft(12,'0');

            }

            string macAddress;

            if(originalMACAddress!="0000" && originalMACAddress.Length==12)

            {

                string mac1,mac2,mac3,mac4,mac5,mac6;

                mac1=originalMACAddress.Substring(10,2);

                mac2=originalMACAddress.Substring(8,2);

                mac3=originalMACAddress.Substring(6,2);

                mac4=originalMACAddress.Substring(4,2);

                mac5=originalMACAddress.Substring(2,2);

                mac6=originalMACAddress.Substring(0,2);

                macAddress=mac1+"-"+mac2+"-"+mac3+"-"+mac4+"-"+mac5+"-"+mac6;

            }

            else

            {

                macAddress="";

            }

            return macAddress.ToUpper();

        }

方法二：使用windows的命令nbtstat

        public static string GetRemoteMacByNetBIOS(string clientIP)

        {

            string ip = clientIP;

            if ( ip == "127.0.0.1")

                ip = GetLocalIP()[0];

            string dirResults="";

            ProcessStartInfo psi = new ProcessStartInfo();

            Process proc = new Process();

            psi.FileName = "nbtstat.exe";

            //psi.RedirectStandardInput = false;

            psi.RedirectStandardOutput = true;psi.RedirectStandardError=true;

            psi.Arguments = "-A " + ip;

            psi.UseShellExecute = false;

            proc = Process.Start(psi);

            dirResults = proc.StandardOutput.ReadToEnd();

            string error = proc.StandardError.ReadToEnd();

            proc.WaitForExit();

            dirResults=dirResults.Replace(""r","").Replace(""n","").Replace(""t","");

            Regex reg=new Regex("Mac[ ]{0,}Address[ ]{0,}=[ ]{0,}(?((.)*?))__MAC",RegexOptions.IgnoreCase|RegexOptions.Compiled);

            Match mc=reg.Match(dirResults+"__MAC");

            if(mc.Success)

            {

                return mc.Groups["key"].Value.ToUpper();

            }

            else

            {                   

               return "";

            }

        }

使用此方法需要足够的操作系统的权限。在Web中,可以将ASP.net用户加入管理员组。

对于上面两个地方都用到的GetLocalIP是一个获取本机IP的方法：

        public static string[] GetLocalIP()

        {

            string hostName = Dns.GetHostName();

            IPHostEntry ipEntry=Dns.GetHostByName(hostName);

            IPAddress[] arr=ipEntry.AddressList;

            string[] result = new string[arr.Length];

            for(int i=0;i            {

                result[i] = arr[i].ToString();  

            }

            return result;

        }获得局域网内计算机的列表

方法一：使用逐个IP地址扫描的方式

利用多线程来对每个IP逐个扫描。

ComputerAddressInfo cai = new ComputerAddressInfo("192.168.1",42,53);

Thread thScan = new Thread(new ThreadStart(cai.ScanComputers));

thScan.Start();

//...