'宣言 Function StartDragSelection( _ ByVal containerElement As UIElement, _ ByVal modifierKeys As Keys, _ ByRef initialSelection As IEnumerable(Of ISelectableItem), _ ByRef selectableItemType As Type _ ) As Boolean
bool StartDragSelection( UIElement containerElement, Keys modifierKeys, out IEnumerable<ISelectableItem> initialSelection, out Type selectableItemType )