C# 获取机器序列号

using System;
using System.Linq;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Windows.Forms;
using System.Drawing;
using System.Data;
using System.Security.Cryptography;
using System.Net;
using System.Runtime.InteropServices;
using System.Reflection;
using System.ComponentModel;
using System.Text.RegularExpressions;

#region  获取系列号

        private static Int32 METHOD_BUFFERED = 0;
        private static Int32 FILE_ANY_ACCESS = 0;
        private static Int32 FILE_DEVICE_HAL = 0x00000101;

        private const Int32 ERROR_NOT_SUPPORTED = 0x32;
        private const Int32 ERROR_INSUFFICIENT_BUFFER = 0x7A;

        private static Int32 IOCTL_HAL_GET_DEVICEID = ((FILE_DEVICE_HAL) << 16) | ((FILE_ANY_ACCESS) << 14) | ((21) << 2) | (METHOD_BUFFERED);
        [DllImport("coredll.dll", SetLastError = true)]
        private static extern bool KernelIoControl(Int32 dwIoControlCode,
        IntPtr lpInBuf, Int32 nInBufSize, byte[] lpOutBuf,
        Int32 nOutBufSize, ref Int32 lpBytesReturned);

        [DllImport("coredll.dll")]
        private static extern bool SetLocalTime(ref WinCESysTime lpSystemTime);

        /// <summary>
        /// 获取机器序列号
        /// </summary>
        /// <returns></returns>
        public static string GetDeviceID()
        {
            byte[] outbuff = new byte[20];
            Int32 dwOutBytes;
            bool done = false;
            Int32 nBuffSize = outbuff.Length;
            BitConverter.GetBytes(nBuffSize).CopyTo(outbuff, 0);
            dwOutBytes = 0;
            while (!done)
            {
                if (KernelIoControl(IOCTL_HAL_GET_DEVICEID, IntPtr.Zero, 0, outbuff, nBuffSize, ref dwOutBytes))
                {
                    done = true;
                }
                else
                {
                    int error = Marshal.GetLastWin32Error();
                    switch (error)
                    {
                        case ERROR_NOT_SUPPORTED:
                            throw new NotSupportedException(
                                "IOCTL_HAL_GET_DEVICEID is not supported on this device",
                                new Win32Exception(error));

                        case ERROR_INSUFFICIENT_BUFFER:

                            // The buffer is not big enough for the data.  The
                            // required size is in the first 4 bytes of the output
                            // buffer (DEVICE_ID.dwSize).
                            nBuffSize = BitConverter.ToInt32(outbuff, 0);
                            outbuff = new byte[nBuffSize];

                            // Set DEVICEID.dwSize to size of buffer.  Some
                            // platforms look at this field rather than the
                            // nOutBufSize param of KernelIoControl when
                            // determining if the buffer is large enough.
                            BitConverter.GetBytes(nBuffSize).CopyTo(outbuff, 0);
                            break;

                        default:
                            throw new Win32Exception(error, "Unexpected error");
                    }
                }
            }

            // Copy the elements of the DEVICE_ID structure.
            Int32 dwPresetIDOffset = BitConverter.ToInt32(outbuff, 0x4);
            Int32 dwPresetIDSize = BitConverter.ToInt32(outbuff, 0x8);
            Int32 dwPlatformIDOffset = BitConverter.ToInt32(outbuff, 0xc);
            Int32 dwPlatformIDSize = BitConverter.ToInt32(outbuff, 0x10);
            StringBuilder sb = new StringBuilder();

            for (int i = dwPresetIDOffset;
                i < dwPresetIDOffset + dwPresetIDSize; i++)
            {
                sb.Append(String.Format("{0:X2}", outbuff[i]));
            }

            sb.Append("-");

            for (int i = dwPlatformIDOffset;
                i < dwPlatformIDOffset + dwPlatformIDSize; i++)
            {
                sb.Append(String.Format("{0:X2}", outbuff[i]));
            }
            return sb.ToString();
        }

        #endregion