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baseItemAdded(properties);
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Application Services Overview
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From this code snippet, we can see that our event receiver is derived from the SPItemEventReceiver base class, and both of the defined methods accept SPItemEventProperties objects as parameters 7 Update the ItemAdding method with the following code:
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public override void ItemAdding(SPItemEventProperties properties) { switch (propertiesAfterProperties["Title"]ToString()) { case "Cancel Me": propertiesStatus = SPEventReceiverStatusCancelNoError; break; case "Update Me": propertiesAfterProperties["Title"] = "Updated title"; break; case "Throw Error": propertiesErrorMessage = "An error occurred"; propertiesStatus = SPEventReceiverStatusCancelWithError; break; case "Redirect": propertiesRedirectUrl = "/_layouts/gearaspx"; propertiesStatus = SPEventReceiverStatusCancelWithRedirectUrl; break; default: break; } }
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8 Deploy the event receiver by choosing Build | Deploy DemoEventReceivers This simple example demonstrates a few of the key features of synchronous event handlers By adding a new item to the Test List that we created earlier with the title set to Cancel Me, the page will be refreshed and no item will be stored in the list This illustrates how we can cancel an action by setting the SPItemEventPropertiesStatus property appropriately By creating a new item with the title set to Update Me, the event handler updates the title value before the item is stored in the content database Setting the title to Throw Error or Redirect illustrates the capability to return a custom error message to the user and to redirect to a custom page In both of these cases, the item is not added to the list 1 Now update the ItemAdded method with the following code:
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public override void ItemAdded(SPItemEventProperties properties) { ThreadSleep(5000); propertiesListItemDelete(); }
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2 Deploy the updated event receiver by choosing Build | Deploy DemoEventReceivers With our revised ItemAdded event receiver, we can see the difference between a synchronous event and an asynchronous event In the code snippet, the calling thread is put to sleep for a few seconds before execution continues During this time, the page will continue to refresh and will show the added item in the list This demonstrates that the ItemAdded event receiver is running on a separate thread Once the thread resumes execution, it will delete the added item Since this action occurs on a separate thread, the results are not immediately visible to the user This highlights one of the drawbacks of asynchronous event receivers As mentioned earlier, we can configure whether an after event handler runs synchronously or asynchronously One easy way to do this is as follows: 1 In the Elementsxml file, edit the XML as follows:
<Elements xmlns="http://schemasmicrosoftcom/sharepoint/"> <Receivers ListTemplateId="100"> <Receiver> <Name>ListEventReceiverItemAdding</Name> <Type>ItemAdding</Type> <Assembly>$SharePointProjectAssemblyFullName$</Assembly> <Class>DemoEventReceiversListEventReceiverListEventReceiver</Class> <SequenceNumber>10000</SequenceNumber> </Receiver> <Receiver> <Name>ListEventReceiverItemAdded</Name> <Type>ItemAdded</Type> <Assembly>$SharePointProjectAssemblyFullName$</Assembly> <Class>DemoEventReceiversListEventReceiverListEventReceiver</Class> <SequenceNumber>10000</SequenceNumber> <Synchronization>Synchronous</Synchronization> </Receiver> </Receivers> </Elements>
Note the addition of the Synchronization element for the ListEventReceiverItemAdded receiver 2 So that we can confirm that our event receiver is being called, update the code in the ItemAdded method like so:
public override void ItemAdded(SPItemEventProperties properties) { ThreadSleep(5000); propertiesListItemRecycle(); }
3 Deploy the updated event receiver by choosing Build | Deploy DemoEventReceivers We can check that our ItemAdded event handler is now running synchronously by creating a new item The first thing to note is that when you click the Save button, the page
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Application Services Overview
will take a bit longer to refresh than previously, because the ThreadSleep(5000) instruction is now running synchronously When the page is refreshed, the new item will not appear in the list; by clicking the Recycle Bin link, we can confirm that the item was created and then moved to the recycle bin by the ItemAdded event receiver
Enabling or Disabling Event Firing
You ve seen how to create event handlers using the SharePoint Customization Wizard in Visual Studio Let s look at how we can handle additional events in an existing event receiver 1 In Visual Studio, select the ListEventReceiver item, as shown:
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