'宣言 Public MustInherit Class GridTileBuilder (Of TControl As GridTile, TBuilder As GridTileBuilder(Of TControl,TBuilder)) Inherits TileBuilder(Of TControl,TBuilder)
public abstract class GridTileBuilder<TControl,TBuilder> : TileBuilder<TControl,TBuilder> where TControl: GridTile where TBuilder: GridTileBuilder<TControl,TBuilder>