'宣言 Public Class MapLayerListFactory (Of T,TOwner As FlexMap(Of T), TMapLayer As MapLayerBase(Of T)) Inherits MapLayerListBaseFactory(Of T,TOwner,TMapLayer)
public class MapLayerListFactory<T,TOwner,TMapLayer> : MapLayerListBaseFactory<T,TOwner,TMapLayer> where TOwner: FlexMap<T> where TMapLayer: MapLayerBase<T>