2-3: EventReceiver1cs with custom event handlers for ItemDeleting and ItemAdded in Visual Studio .NET

Make QR in Visual Studio .NET 2-3: EventReceiver1cs with custom event handlers for ItemDeleting and ItemAdded
Listing 2-3: EventReceiver1cs with custom event handlers for ItemDeleting and ItemAdded
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Creating a SharePoint Solution
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2: SharePoint Development in Visual Studio 2010 The Root Project Item Node or Folder (EventReceiver1)
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When you click on the root level SharePoint project item node EventReceiver1, you will see several properties in the Properties window that can be configured as shown in Figure 2-15 First note that the Properties window indicates that EventReceiver1 is a folder the Properties window says Folder Properties The properties for EventReceiver1 are organized into three categories: Misc, SharePoint, and SharePoint Events Let s consider the properties in each of these three categories
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Figure 2-15: The properties associated with the EventReceiver1 node
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Creating a SharePoint Solution Misc Properties The sole property under the Misc category in Figure 2-15
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is Folder Name If you change the name of the project item node either by changing the Folder Name property or by renaming the project item node in the Solution Explorer, it will automatically change some but not all areas in the project that refer to the project item node For example, if you were to rename EventReceiver1 to EventReceiver2, Visual Studio automatically fixes up the feature Feature1 associated with the SharePoint project item to refer to the new project item name But it doesn t change the names of the files contained in the (now EventReceiver2) folder or any of the classes that were created So after changing the node to EventReceiver2, the code file is still titled EventReceiver1cs and the class inside the code file is still titled EventReceiver1 More critically, the Elementsxml file still refers to EventReceiver1 You could manually rename EventReceiver1cs to EventReceiver2cs and even refactor the class contained in the newly renamed EventReceiver2cs file to be EventReceiver2 In this case, the Elementsxml file will be updated correctly But in some cases the Elementsxml file will not be updated correctly after a refactor For example, if you change the namespace that your class is defined in from SharePointProject1EventReceiver1 to SharePointProject1MyEventReceiver, the Elementsxml file will not be updated to have the right fully qualified class names in the Class elements You would have to manually update the Elementsxml file to ensure it contains the new SharePointProject1MyEventReceiver namespace or the project won t run successfully
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SharePoint Properties Continuing with our exploration of the properties
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associated with the root level SharePoint project item node EventReceiver1, you will see a number of properties under the category SharePoint in Figure 2-15 Feature Properties is a collection of key value pairs that are used when deploying the feature associated with the event receiver to SharePoint These properties are deployed with the feature and can be accessed later in SharePoint using the SPFeaturePropertyCollection object So for example, you might use feature properties to associate some configuration information or other static data with your feature
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2: SharePoint Development in Visual Studio 2010
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The Feature Receiver set of properties includes the subproperties Assembly and Class Name You can use these properties to specify an assembly and class name that you want to handle events that are raised when the Feature associated with your EventReceiver1 item is raised You can create a class in your current solution and refer to it or include another assembly in your SharePoint package for more information on how to include additional assemblies in your SharePoint package, see 11, Packaging and Deployment Events that your feature receiver can handle include FeatureInstalled, FeatureUninstalling, FeatureActivated, and FeatureDeactivating So you could write code that runs when your EventReceiver1 is installed and uninstalled from the SharePoint site, maybe to add additional resources or lists required on install and remove those additional resources or lists on uninstall We will discuss feature event receivers more in 5, SharePoint Event Receivers Project Output References are used to tell Visual Studio about any dependent assemblies your project item requires to run For example, maybe your event receiver uses a helper class library called HelperLibrary dll You can use the Project Output References project to tell Visual Studio about the helper class library and then Visual Studio will package the dependent assembly in the final solution For more on Project Output References, see 11, Packaging and Deployment Finally Safe Control Entries is used to designate whether an ASPX control or web part is trusted and can be used by users on the site In the context of an Event Receiver, this property is not applicable and doesn t do anything We will see this property used in 9, SharePoint Web Parts
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