'宣言 Public MustInherit Class MapOwnedCollectionBase(Of T As MapOwnedItemBase) Inherits System.Collections.ObjectModel.ObservableCollection(Of T) Implements IMapOwnedCloneable
public abstract class MapOwnedCollectionBase<T> : System.Collections.ObjectModel.ObservableCollection<T>, IMapOwnedCloneable where T: MapOwnedItemBase