In SharePoint Portal development there are many scenarios where we need to develop event receivers.
So for accessing list item/ library item values, we need to use BeforeProperties and AfterProperties of SharePoint Event receivers. But some times they give empty or null values.
Below chart gives great understanding of which values are populated in BeforeProperties , AfterProperties and properties.ListItem objects.
For list:
For library:
For list:
List | BeforeProperties | properties.ListItem | AfterProperties |
ItemAdding | Empty | Null | New Value |
ItemAdded | Empty | New Value | New Value |
ItemUpdating | Empty | Old Values | Updated Values |
ItemUpdated | Empty | Updated Values | Updated Values |
ItemDeleting | Empty | Original Values | Empty |
ItemDeleted | Empty | Null | Empty |
For library:
List | BeforeProperties | properties.ListItem | AfterProperties |
ItemAdding | Empty | Null | Empty |
ItemAdded | Empty | New Value | Empty |
ItemUpdating | Old Values | Old Values | Updated Values |
ItemUpdated | Old Values | Updated Values | Updated Values |
ItemDeleting | Empty | Original Values | Empty |
ItemDeleted | Empty | Null | Empty |
The Synergy MOSS blog has explain this more clearly, please check here for more details.
Good Post on "SP 2010: How To – Event Receivers and Custom Error Pages" by Tobias Zimmergren .
http://zimmergren.net/technical/sp-2010-how-to-event-receivers-and-custom-error-pages
http://zimmergren.net/technical/sp-2010-how-to-event-receivers-and-custom-error-pages
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