Describes the action that caused the collectionChanged event to fire.
| 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). |
