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Figure 7-19: Edit Item form
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We now know how to add columns to our content type using existing site column definitions but what if we want to use a column like Camera model that doesn t exist yet We could create a site column from the SharePoint UI as we demonstrated earlier in this chapter, or we could do it from within Visual Studio 2010 In order to create a new site column from within Visual Studio 2010 we are going to use the Empty Element project item template Follow the steps below to create a new site column with empty element project item, reference it in the content type, and then deploy both the site column and the content type to SharePoint 1 Right click the MyFirstContentType project node in the Solution Explorer and select Add > New Item 2 Select the Empty Element template from the Add New Item dialog
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3 Name the element SiteColumns and click Add to add it to the project An empty element project item is just what the name suggests it is It contains an empty Elementsxml file We are going to use this Elementsxml file to create site columns We can use the Field element to create new site columns for each new site column we create we must specify an ID, Name, and Type of the column It s also a good practice to specify the Site column group name as well as the display name the text that gets displayed in forms and column headers
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IDs in SharePoint are typically just GUIDs a big long number that uniquely identifies items in SharePoint You can easily create new GUIDs from within Visual Studio 2010 by selecting Create GUID from the Tools menu SharePoint uses registry format GUIDs so make sure you select that option in the Create GUID dialog Then paste the resulting GUID into your Elementsxml file
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4 The Elementsxml file contents with a new Field element added is shown in Listing 7-5
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Listing 7-5: Empty Element s Elementsxml Defining a New Site Column
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5 We must reference this site column from the content type s Elementsxml file We can do this exactly the same way we did it for existing site columns Open the content type Elementsxml and add the following line within the FieldRefs element The ID you use here is the same ID you used in the Empty Element project item s Elementsxml file
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6 Press F5 to deploy the project 7 Click on the MyFirstContentType ContentType1 link 8 Notice the CameraModel field with the display name Camera Used is in the content type as shown in Figure 7-20
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Figure 7-20: A new site column Camera Used in the MyFirstContentType content type
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There are some problems with our current implementation however If you retract this solution, you will notice that the CameraModel site column doesn t get removed This is because we are creating the CameraModel field with an Empty Element and Visual Studio doesn t know anything about the contents of Empty Element and how to uninstall it A second problem that can occur is that we really need to ensure that our site column definition always gets activated before the content type Otherwise, the activation of the content type could fail because it refers to CameraModel, a site column that might get installed after the content type To remedy these two issues, we are going to create a second feature and install the site column definition with the second feature and the content type with the first feature Then we ll create a feature dependency between the two features that tells Visual Studio that the second feature (where our site column definition is) must be installed before the first feature (where our content type is) Finally, we ll write an event handler for the second feature that removes the CameraModel site column when the second feature is uninstalled 1 Right click the Features folder 2 Select Add Feature
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