'宣言
Public MustInherit Class _RectangleView(Of TOwnerView As IView) Inherits _BaseView(Of TOwnerView) Implements IQueryInterface, IRectangleView, IView
public abstract class _RectangleView<TOwnerView> : _BaseView<TOwnerView>, IQueryInterface, IRectangleView, IView where TOwnerView: IView