SharePoint 2010 introduces the following changes to the List:
- New events - WebAdding, WebProvisioning, ListAdding, ListAdded, ListDeleting, ListDeleted
- Site Collection events
- Synchronous "after" events to perform post-processing
- Custom error pages
- New property PSEventPropertiesBase to store the user name and token of the person who triggered the effective action
- New integrity constraints based on the lookup
- Projected Fields - fields from the parent which are referenced and displayed in the child list
- Lists Join - via LINQ, CAML, SharePoint Designer and API (SPQuery.Join and SPQuery.ProjectedFileds)
- Max 50M items under the read scenario
- List query size threshold - return warning or exception of query result exceeds threshold number of records
- Threshold pre-set is 5000 items for the normal user and 20000 items for the Super User
- List Administrators are notified when lists exceed threshold
- List constraints - max 8kb of data per list item (excluding attachments), 6 projected fields on joins (except using the view fields)
- Columns can be flagged as UNIQUE (must be indexed)
- Columns can be validated using custom field or by other fields
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