C#读取计算机CPU及HDD信息的方法

public string getCpuInfo() //读取CPU信息
{
 ManagementClass mobj = new ManagementClass("Win32_Processor");
 ManagementObjectCollection moc = mobj.GetInstances();
 foreach (ManagementObject mo in moc)
 {
  return mo.Properties["ProcessorId"].Value.ToString();
 }
 return "";
}
public string getHddInfo() //读取硬盘信息
{
 ManagementClass mobj = new ManagementClass("Win32_PhysicalMedia");
 ManagementObjectCollection moc = mobj.GetInstances();
 foreach (ManagementObject mo in moc)
 {
  return mo.Properties["SerialNumber"].Value.ToString();
 }
 return "";
}