'宣言 Public MustInherit Class PropertyMappingCollection (Of TKey,TMapping As {New, PropertyMappingBase(Of TKey)}) Inherits Infragistics.Collections.ObservableCollectionExtended(Of TMapping)
public abstract class PropertyMappingCollection<TKey,TMapping> : Infragistics.Collections.ObservableCollectionExtended<TMapping> where TMapping: new(), PropertyMappingBase<TKey>