How to Create an Event Receiver for a Specific List Instance in SharePoint2010/SharePoint2007

A list instance event receiver responds to events that occur in any instance of a list definition. Although the event receiver template does not enable the targeting of a specific list instance, you can modify an event receiver that is scoped to a list definition to respond to events in a specific list instance.

To target a specific list instance, in the Elements.xml for the event receiver, replace ListTemplateId with ListUrl and add the URL of the list instance.

Creating a List Instance Event Receiver:

The following steps show how to modify a list item event receiver to respond only to events that occur in a custom announcements-list instance.

To modify an event receiver to respond to a specific list instance

1. In a browser, open the SharePoint site.

2. In the navigation pane, Lists link.

3. In the All Site Content page, choose the Create link.

4. In the Create dialog box, choose the Announcements type, name the announcement TestAnnouncements, and then choose the Create button.

5. In Visual Studio, create an event receiver project.

6. In the What type of event receiver do you want? list, choose List Item Events.

   Note
   You can also select any other kind of event receiver that scopes to a list definition, for example, List Email Events or List Workflow Events.

7. In the What item should be the event source? list, choose Announcements.

8. In the Handle the following events list, select the An item is being added check box, and then choose the Finish button.

9. In Solution Explorer, under EventReceiver1, open Elements.xml.

   The event receiver currently references the Announcements list definition by using the following line:

   <Receivers ListTemplateId="104">  

   Change this line to the following text:

   <Receivers ListUrl="Lists/TestAnnouncements">  

   This directs the event receiver to respond only to events that occur in the new TestAnnouncements announcements list that you just created. You can change the ListURL attribute to reference any list instance on the SharePoint server.

10. Open the code file for the event receiver and put a breakpoint in the ItemAdding method.

11. Choose the F5 key to build and run the solution.

12. In SharePoint, choose the TestAnnouncements link in the navigation pane.

13. Choose the Add new announcement link.

14. Enter a title for the announcement, and then choose the Save button.

    Notice that the breakpoint is hit when the new item is added to the custom announcements list.

15. Choose the F5 key to resume.

16. In the navigation pane, choose the Lists link, and then choose the Announcements link.

17. Add a new announcement.

    Notice that the event receiver does not trigger on the new announcement because the receiver is configured to respond only to events in the custom announcement list instance, TestAnnouncements.