NotifyCollectionChangedAction Enumeration
Enumeration members
Add
Add: = 0
An item was added to the collection.
Change
Change: = 2
An item was changed or replaced.
Remove
Remove: = 1
An item was removed from the collection.
Reset
Reset: = 3
Several items changed simultaneously (for example, the collection was sorted, filtered, or grouped).
Describes the action that caused the INotifyCollectionChanged.collectionChanged event to fire.