C# 获取机器码

using System.Runtime.InteropServices;
using System.Management;
using System;

public class HardwareInfo
{
    //取机器名
    public string GetHostName()
    {
    return System.Net.Dns.GetHostName();
    }

    //取CPU编号
    public String GetCpuID()
    {
        try
        {
            ManagementClass mc = new ManagementClass("Win32_Processor");
            ManagementObjectCollection moc = mc.GetInstances();

            String strCpuID = null ;
            foreach( ManagementObject mo in moc )
            {
                strCpuID = mo.Properties["ProcessorId"].Value.ToString();
                break;
            }
            return strCpuID;
        }
        catch
        {
            return "";
        }

    }//end method

//取第一块硬盘编号
    public String GetHardDiskID()
    {
        try
        {
            ManagementObjectSearcher searcher = new ManagementObjectSearcher("SELECT * FROM Win32_PhysicalMedia");
            String strHardDiskID = null ;
            foreach(ManagementObject mo in searcher.Get())
            {
                strHardDiskID = mo["SerialNumber"].ToString().Trim();
                break;
            }
            return strHardDiskID ;
        }
        catch
        {
            return "";
        }
    }//end

public enum NCBCONST
{
    NCBNAMSZ =16, /**//* absolute length of a net name */
    MAX_LANA =254, /**//* lana's in range 0 to MAX_LANA inclusive */
    NCBENUM =0x37, /**//* NCB ENUMERATE LANA NUMBERS */
    NRC_GOODRET =0x00, /**//* good return */
    NCBRESET =0x32, /**//* NCB RESET */
    NCBASTAT =0x33, /**//* NCB ADAPTER STATUS */
    NUM_NAMEBUF =30, /**//* Number of NAME's BUFFER */
}

    [StructLayout(LayoutKind.Sequential)]
    public struct ADAPTER_STATUS
    {
        [MarshalAs(UnmanagedType.ByValArray, SizeConst=6)]
        public byte[] adapter_address;
        public byte rev_major;
        public byte reserved0;
        public byte adapter_type;
        public byte rev_minor;
        public ushort duration;
        public ushort frmr_recv;
        public ushort frmr_xmit;
        public ushort iframe_recv_err;
        public ushort xmit_aborts;
        public uint xmit_success;
        public uint recv_success;
        public ushort iframe_xmit_err;
        public ushort recv_buff_unavail;
        public ushort t1_timeouts;
        public ushort ti_timeouts;
        public uint reserved1;
        public ushort free_ncbs;
        public ushort max_cfg_ncbs;
        public ushort max_ncbs;
        public ushort xmit_buf_unavail;
        public ushort max_dgram_size;
        public ushort pending_sess;
        public ushort max_cfg_sess;
        public ushort max_sess;
        public ushort max_sess_pkt_size;
        public ushort name_count;
    }

    [StructLayout(LayoutKind.Sequential)]
    public struct NAME_BUFFER
    {
        [MarshalAs(UnmanagedType.ByValArray, SizeConst=(int)NCBCONST.NCBNAMSZ)]
        public byte[] name;
        public byte name_num;
        public byte name_flags;
    }

    [StructLayout(LayoutKind.Sequential)]
    public struct NCB
    {
        public byte ncb_command;
        public byte ncb_retcode;
        public byte ncb_lsn;
        public byte ncb_num;
        public IntPtr ncb_buffer;
        public ushort ncb_length;
        [MarshalAs(UnmanagedType.ByValArray, SizeConst=(int)NCBCONST.NCBNAMSZ)]
        public byte[] ncb_callname;
        [MarshalAs(UnmanagedType.ByValArray, SizeConst=(int)NCBCONST.NCBNAMSZ)]
        public byte[] ncb_name;
        public byte ncb_rto;
        public byte ncb_sto;
        public IntPtr ncb_post;
        public byte ncb_lana_num;
        public byte ncb_cmd_cplt;
        [MarshalAs(UnmanagedType.ByValArray, SizeConst=10)]
        public byte[] ncb_reserve;
        public IntPtr ncb_event;
    }

    [StructLayout(LayoutKind.Sequential)]
    public struct LANA_ENUM
    {
        public byte length;
        [MarshalAs(UnmanagedType.ByValArray, SizeConst=(int)NCBCONST.MAX_LANA)]
        public byte[] lana;
    }

    [StructLayout(LayoutKind.Auto)]
    public struct ASTAT
    {
        public ADAPTER_STATUS adapt;
        [MarshalAs(UnmanagedType.ByValArray, SizeConst=(int)NCBCONST.NUM_NAMEBUF)]
        public NAME_BUFFER[] NameBuff;
    }
    public class Win32API
    {
        [DllImport("NETAPI32.DLL")]
        public static extern char Netbios(ref NCB ncb);
    }

    //取网卡mac
    public string GetMacAddress()
    {
        string addr="";
        try
        {
            int cb;
            ASTAT adapter;
            NCB Ncb=new NCB();
            char uRetCode;
            LANA_ENUM lenum;

            Ncb.ncb_command = (byte)NCBCONST.NCBENUM;
            cb = Marshal.SizeOf(typeof(LANA_ENUM));
            Ncb.ncb_buffer = Marshal.AllocHGlobal(cb);
            Ncb.ncb_length = (ushort)cb;
            uRetCode = Win32API.Netbios(ref Ncb);
            lenum = (LANA_ENUM)Marshal.PtrToStructure(Ncb.ncb_buffer, typeof(LANA_ENUM));
            Marshal.FreeHGlobal(Ncb.ncb_buffer);
            if(uRetCode != (short)NCBCONST.NRC_GOODRET)
            return "";

            for(int i=0; i < lenum.length ;i++)
            {
                Ncb.ncb_command = (byte)NCBCONST.NCBRESET;
                Ncb.ncb_lana_num = lenum.lana[i];
                uRetCode = Win32API.Netbios(ref Ncb);
                if(uRetCode != (short)NCBCONST.NRC_GOODRET)
                return "";

                Ncb.ncb_command = (byte)NCBCONST.NCBASTAT;
                Ncb.ncb_lana_num = lenum.lana[i];
                Ncb.ncb_callname[0]=(byte)'*';
                cb = Marshal.SizeOf(typeof(ADAPTER_STATUS)) + Marshal.SizeOf(typeof(NAME_BUFFER))*(int)NCBCONST.NUM_NAMEBUF;
                Ncb.ncb_buffer = Marshal.AllocHGlobal(cb);
                Ncb.ncb_length = (ushort)cb;
                uRetCode = Win32API.Netbios(ref Ncb);
                adapter.adapt = (ADAPTER_STATUS)Marshal.PtrToStructure(Ncb.ncb_buffer, typeof(ADAPTER_STATUS));
                Marshal.FreeHGlobal(Ncb.ncb_buffer);

                if (uRetCode == (short)NCBCONST.NRC_GOODRET)
                {
                    if(i>0)
                    addr += ":";
                    addr = string.Format("{0,2:X}{1,2:X}{2,2:X}{3,2:X}{4,2:X}{5,2:X}",
                    adapter.adapt.adapter_address[0],
                    adapter.adapt.adapter_address[1],
                    adapter.adapt.adapter_address[2],
                    adapter.adapt.adapter_address[3],
                    adapter.adapt.adapter_address[4],
                    adapter.adapt.adapter_address[5]);
                }
            }
        }
        catch
        {
        }
        return addr.Replace(' ', '0');
    }
}

出处：https://www.cnblogs.com/MaxWoods/archive/2008/03/11/1100666.html