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So, why can we not deploy the solution now At this point, we have three main components in our solution. First, there are the site columns, one of which is a lookup column to a list, and then there s the Categories list, which we are about to create. So, to activate the site columns feature, we must first make sure we activate the lists feature. Now, the lists feature adds a content type, or two actually, to the list. So, it makes sense to have the list dependent on the content type being activated. You may see where this is going. The content type is utilizing the site columns we added, including the lookup column. So, now the content type depends on the site columns feature, which depends on the list feature, which depends on the content type feature. Circular references and madness ahead. But we are smarter than that, aren t we
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Exercise 13-9. Adding the Categories List, Take 2
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In this exercise, you will solve the circular dependency by creating a separate feature for the Categories list. 1. Add a new WSPBuilder Blank feature to your project. Call it something like TimesArticleCategoriesList. Make it web scoped, and add a nice description. Cool list is not a nice description. 2. Open the Feature.xml file of the TimesArticleCategoriesList feature file, and add the following ElementManifest: <ElementManifest Location="CategoriesList.xml"/> You can also delete the existing element manifest pointing to the elements.xml file, as well as the elements.xml file of the feature folder. We will not be using those. 3. Move the CategoriesList.xml file from the TimesLists feature to the TimesArticleCategoriesList feature. You can do this by dragging and dropping the file in the Solution Explorer. 4. In the Feature.xml file of the TimesLists feature, remove the corresponding ElementManifest. That s it. We have now separated out the Categories list into a separate feature so our site columns can depend on the new feature and avoid circular references.
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Fixing the List Deletion Problem
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You may have been surprised by a small issue with the News list. If you try to delete the list, regardless of whether you have items in the list, you will get a message saying Cannot delete news. If it happened, it happened. Of course, you remember that we set up an event handler to give us this message in the previous chapter. This may be surprising because there are no items in the list and the event handler that causes this error is connected to the ItemDeleting event. Even if you have no items in the list, the ItemDeleting event handler prevents you from deleting the list. Why The answer becomes clear after a bit of SharePoint Manager investigation. Open your list in SPM, and look at the items there (see Figure 13-7).
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Figure 13-7. Mystery solved. When we add a content type to a list, SharePoint creates two folders to hold content type resources for us. And, as we remember from 8, folders are nothing but normal items with a specific content type inheritance. Thus, the ItemDeleting event is fired for these two folder items, preventing us from deleting the list. Let s see whether we can fix this annoyance.
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Exercise 13-10. Fixing the ItemDeleted Event Handler
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In this exercise, you are going to update the ItemDeleted event handler created in 12. 1. Open the TimesNewsEventReceivers.cs file. 2. Modify ItemDeleting, and update the code as such: public override void ItemDeleting(SPItemEventProperties properties) { if (properties.ListItem != null) // Fix to delete empty lists { properties.Cancel = true; properties.ErrorMessage = "Cannot delete news. If it happened, it happened."; } } 3. Build and then deploy or upgrade your solution. You should be able to delete your list as normal now.
Accountants, Go Home!
We re done with lists for now. No more. The accountants may have had a field day, but we are going home. Or, at least, we are going to go to the next chapter. Our empire is growing steadily. Using the current code, we are able to get our news web site up and running. But we want more . In the next two chapters, we will expand our solution to add some custom pages to our site and additionally wrap up everything into a single site definition. After that, we will have a complete SharePoint site ready to deploy at the click of a button. You know that s just a saying, right See you on the next page.
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