SharePoint Custom Field - is it possible to handle item deletion event?

I'm expanding SPFieldText and BaseFieldControl to create a custom field. The field saves some data externally (for e开发者_如何学Cxample, on a database or on another list)

Within the control I'm able to handle Edit and New events (using ControlMode).

I'd like to run a function and clean up some data when an item containing my field is deleted. Is this possible, in the context of a custom field?

No, the field has no "knowledge" of the item it is contained in. You could however perform the cleanup by creating an ItemEventReceiver.