c#如何获得cpu,硬盘的物理序列号

using System;
using System.Runtime.InteropServices;
using  System.Management;
namespace Hardware
{
 /// <summary>
 /// Hardware_Mac 的摘要说明。
 /// </summary>
 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                              */

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