| Name | Value | Description |
|---|---|---|
| Add | 0 | An item was added to the collection. |
| Remove | 1 | An item was removed from the collection. |
| Change | 2 | An item was changed or replaced. |
| Reset | 3 | Several items changed simultaneously (for example, the collection was sorted, filtered, or grouped). |
Describes the action that caused the collectionChanged event to fire.