'宣言 Public Class MapLayerBaseBuilder (Of T,TControl As MapLayerBase(Of T), TBuilder As MapLayerBaseBuilder(Of T,TControl,TBuilder)) Inherits BaseBuilder(Of TControl,TBuilder)
public class MapLayerBaseBuilder<T,TControl,TBuilder> : BaseBuilder<TControl,TBuilder> where TControl: MapLayerBase<T> where TBuilder: MapLayerBaseBuilder<T,TControl,TBuilder>