C#檢測光驅里的光盤是否已經加載

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using System;
using System.Management;

class App
{
  public static void Main()
  {
    SelectQuery query = new SelectQuery( "select * from win32_logicaldisk where drivetype=5" );
    ManagementObjectSearcher searcher = new ManagementObjectSearcher(query);

foreach( ManagementObject mo in searcher.Get() )
{
  // If both properties are null I suppose there's no CD
  if( ( mo["volumename"] != null ) || ( mo["volumeserialnumber"] != null ) )
  {
    Console.WriteLine( "CD is named: {0}", mo["volumename"] );
    Console.WriteLine( "CD Serial Number: {0}", mo["volumeserialnumber"] );
  }
  else
  {
    Console.WriteLine( "No CD in Unit" );
  }
}

// Here to stop app from closing
Console.WriteLine( "\nPress Return to exit." );
Console.Read();

}
}</pre>