'宣言
Public Class CachedMap (Of TSource As {Class, INotifyCollectionChanged, ICollection(Of Integer)}, TValue) Implements IItemCollection(Of T), IItemCollection(Of TValue), INotificationCollection(Of TValue), GrapeCity.Viewer.Common.INotifyCollectionChanged
public class CachedMap<TSource,TValue> : IItemCollection<T>, IItemCollection<TValue>, INotificationCollection<TValue>, GrapeCity.Viewer.Common.INotifyCollectionChanged where TSource: class, INotifyCollectionChanged, ICollection<int>