一个有趣的Icon问题

Icon class:
System.Object
   System.MarshalByRefObject
      System.Drawing.IconImage class:An abstract base class that provides functionality for the Bitmap and Metafile descended classes.
System.Object
   System.MarshalByRefObject
      System.Drawing.Image
         System.Drawing.Bitmap
         System.Drawing.Imaging.MetafileIcon->Image 使用Icon.ToBitmap方法
public Bitmap ToBitmap();