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As covered in this chapter, the object model provides a very powerful way to use and extend the SharePoint platform, not only employing things like web parts but also using applications to do background work while running outside of the SharePoint environment In addition, the functionality provided by Web Services extends this power even across server farms Although it can seem daunting at first (after all, there is quite a bit to it), you will find the object model features to be your best friend when developing in and on SharePoint

9:

vent Receivers (formerly known as event handlers) are yet another tool in the arsenal for working with and extending SharePoint Event Receivers are code assemblies that you can attach to a given list or library type and that allow you to respond to a given event, such as an item being changed Receivers provide a way to extend SharePoint both internally and externally, because receivers are not bound to SharePoint They are started and run by SharePoint and have complete access to the SharePoint object model (and subsequently any lists, libraries, sites, and so on, within it), but as a NET assembly, they can call web services, access databases, and they can even send e-mail Event Receivers apply to all items within SharePoint including lists and libraries When an event occurs such as a file move, a document upload, or similar the receiver is notified about the event that occurred, as well as about what the item (and columns) looked like before and after the event This also includes some trapping; for example, a file delete can be prevented before it occurs The mechanics of an Event Receiver are the same as for Features or web parts; Feature definition files are used to define the assembly and also to define the type of list/library (and the events in that list) that the receiver will listen for Multiple receivers can also work on the same list type (like a workflow) Like a Feature, they can be enabled or disabled by site

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Event Receivers give you the ability to react to a list or library event within SharePoint, which includes adding, updating, and deleting any item For example, a Receiver might trigger when a Task Item is created and in turn, create a Calendar Item on another site One receiver can react to any number of events You might be asking yourself why you would use Event Receivers when you have alerts and built-in workflows The answer is simple: there are times when a workflow is too much or not enough; for example, if you want to send an e-mail message to a third party (like an auditor) when a certain document type is published If you re not a member of the site, you can t use alerts You could create a very simple workflow, but you would have to add it everywhere An Event Receiver is tied to a list type, can run on all sites, and can easily handle such one-off or otherwise unique activities Event Receivers are really good for handling integrity, one-off situations, and for extending SharePoint beyond what workflows can do and into other systems like Microsoft BizTalk and CRM On the integrity side, Event Receivers can be used to ensure that items are

the one you re working on You can change the query type and proceed To change the query type while in Design view, choose the type you want from the Query menu or right-click in the table area of the Query window, point to Query Type, and choose the type from the shortcut menu

correctly entered or that certain conditions are met before permitting a change Event Receivers provide before and after methods, which permit you to catch what s changing before it changes To extend SharePoint, Event Receivers can call web services, update databases, provide input to backend systems, and so on While it s tempting, receivers shouldn t be used to create user workflows They are only tied to a list type, and any processing between different receivers, lists, and sites must be managed by the developer As code, they cannot be changed easily and are not accessible to the users except to turn them on and off As well, they have some quirks (as you ll read later in the chapter) that require double-checking statuses and other tasks that make them unusable for some situations

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