'宣言
Public Class _OverlayGeneralLegendItem Inherits _ItemizedLegendItemDataModel Implements IColorLegendItem, IItemizedLegendItemDataModel, IQueryInterface, IStyleLegendItem
public class _OverlayGeneralLegendItem : _ItemizedLegendItemDataModel, IColorLegendItem, IItemizedLegendItemDataModel, IQueryInterface, IStyleLegendItem