<PackageReference Include="System.Management" Version="4.5.0" />

        var search = new ManagementObjectSearcher("SELECT * FROM Win32_BIOS");
        var mobos = search.Get();
        foreach (var temp in mobos)
        {
          object serial = temp["SerialNumber"]; // ProcessorID if you use Win32_CPU
          pcsn = serial.ToString();
          Console.WriteLine(pcsn);
        }

    /// <summary>
    /// 獲得pc號(hào)
    /// </summary>
    public static string GetPcsnString()
    {
      var pcsn = "";
      try
      {
        var search = new ManagementObjectSearcher("SELECT * FROM Win32_BIOS");
        var mobos = search.Get();
        foreach (var temp in mobos)
        {
          object serial = temp["SerialNumber"]; // ProcessorID if you use Win32_CPU
          pcsn = serial.ToString();
          Console.WriteLine(pcsn);

          if
          (
            !string.IsNullOrEmpty(pcsn)
            && pcsn != "To be filled by O.E.M" //沒(méi)有找到
            && !pcsn.Contains("O.E.M")
            && !pcsn.Contains("OEM")
            && !pcsn.Contains("Default")
          )
          {
            break;
          }
          else
          {
            Console.WriteLine("默認(rèn)值");
          }
        }
      }
      catch (Exception e)
      {
        Debug.WriteLine(e);
        // 無(wú)法處理
      }

      return pcsn;
    }