'宣言 Protected Overrides Sub OnSelectionChanged( _ ByVal oldCollection As PivotSelectedCollectionBase(Of PivotDataRow), _ ByVal newCollection As PivotSelectedCollectionBase(Of PivotDataRow) _ )
protected override void OnSelectionChanged( PivotSelectedCollectionBase<PivotDataRow> oldCollection, PivotSelectedCollectionBase<PivotDataRow> newCollection )