using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Management;
using System.Windows.Forms;

namespace 機器碼
{
    class Program
    {
        [STAThread]
        static void Main(string[] args)
        {
            string baseBoardSerial = GetWMIProperty("Win32_BaseBoard", "SerialNumber");
            string cpuID = GetWMIProperty("Win32_Processor", "ProcessorId");
            string diskSerial = GetWMIProperty("Win32_DiskDrive", "SerialNumber");

            string message = $"主板序列號：{baseBoardSerial}\n" +
                             $"CPU ID：{cpuID}\n" +
                             $"硬盤序列號：{diskSerial}";

            MessageBox.Show(message, "機器碼", MessageBoxButtons.OK, MessageBoxIcon.Information);
        }
        static string GetWMIProperty(string className, string propertyName)
        {
            try
            {
                using (ManagementClass mc = new ManagementClass(className))
                {
                    foreach (ManagementObject mo in mc.GetInstances())
                    {
                        return mo[propertyName]?.ToString().Trim();
                    }
                }
            }
            catch (Exception ex)
            {
                return $"獲取失敗: {ex.Message}";
            }
            return "未找到";
        }
    }
}

dotnet add package System.Management

using System;
using System.Management;
using System.Net.NetworkInformation;
using System.Security.Cryptography;
using System.Text;
public class MachineCodeHelper
{
    /// <summary>
    /// 獲取計算機唯一標識碼（機器碼）
    /// </summary>
    /// <returns>64位十六進制字符串</returns>
    public static string GetMachineCode()
    {
        string cpuId = GetCpuId();
        string diskId = GetDiskId();
        string boardId = GetMotherboardId();
        string mac = GetMacAddress();
        // 組合所有信息
        string raw = $"{cpuId}|{diskId}|{boardId}|{mac}";
        // 計算哈希
        using (SHA256 sha256 = SHA256.Create())
        {
            byte[] bytes = Encoding.UTF8.GetBytes(raw);
            byte[] hash = sha256.ComputeHash(bytes);
            return BitConverter.ToString(hash).Replace("-", "").ToLower();
        }
    }
    /// <summary>
    /// 獲取 CPU ID（可能為 null）
    /// </summary>
    private static string GetCpuId()
    {
        try
        {
            using (ManagementObjectSearcher searcher = new ManagementObjectSearcher("SELECT ProcessorId FROM Win32_Processor"))
            {
                foreach (ManagementObject obj in searcher.Get())
                {
                    return obj["ProcessorId"]?.ToString() ?? "";
                }
            }
        }
        catch { }
        return "UNKNOWN_CPU";
    }
    /// <summary>
    /// 獲取第一個物理硬盤序列號
    /// </summary>
    private static string GetDiskId()
    {
        try
        {
            using (ManagementObjectSearcher searcher = new ManagementObjectSearcher("SELECT SerialNumber FROM Win32_DiskDrive WHERE Index=0"))
            {
                foreach (ManagementObject obj in searcher.Get())
                {
                    string serial = obj["SerialNumber"]?.ToString();
                    if (!string.IsNullOrEmpty(serial))
                        return serial.Trim();
                }
            }
        }
        catch { }
        return "UNKNOWN_DISK";
    }
    /// <summary>
    /// 獲取主板序列號
    /// </summary>
    private static string GetMotherboardId()
    {
        try
        {
            using (ManagementObjectSearcher searcher = new ManagementObjectSearcher("SELECT SerialNumber FROM Win32_BaseBoard"))
            {
                foreach (ManagementObject obj in searcher.Get())
                {
                    string serial = obj["SerialNumber"]?.ToString();
                    if (!string.IsNullOrEmpty(serial))
                        return serial;
                }
            }
        }
        catch { }
        return "UNKNOWN_MB";
    }
    /// <summary>
    /// 獲取第一個物理網(wǎng)卡的 MAC 地址（排除虛擬網(wǎng)卡）
    /// </summary>
    private static string GetMacAddress()
    {
        try
        {
            foreach (NetworkInterface nic in NetworkInterface.GetAllNetworkInterfaces())
            {
                // 只考慮物理網(wǎng)卡、上行鏈路且網(wǎng)絡類型為以太網(wǎng)/WiFi
                if (nic.NetworkInterfaceType == NetworkInterfaceType.Ethernet ||
                    nic.NetworkInterfaceType == NetworkInterfaceType.Wireless80211)
                {
                    if (nic.OperationalStatus == OperationalStatus.Up &&
                        !nic.Description.ToLower().Contains("virtual") &&
                        !nic.Description.ToLower().Contains("vmware") &&
                        !nic.Description.ToLower().Contains("vbox"))
                    {
                        byte[] macBytes = nic.GetPhysicalAddress().GetAddressBytes();
                        if (macBytes.Length == 6)
                        {
                            return BitConverter.ToString(macBytes).Replace("-", "").ToLower();
                        }
                    }
                }
            }
        }
        catch { }
        return "UNKNOWN_MAC";
    }
}

class Program
{
    static void Main()
    {
        string machineCode = MachineCodeHelper.GetMachineCode();
        Console.WriteLine($"機器碼: {machineCode}");
        // 輸出類似: a1b2c3d4e5f6...
    }
}