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CHAPTER 6 WHAT LURKS IN THE FOREST OF LISTS
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The important thing for us now is the SPExternalEmailHandler and, more to the point, the ProcessMessage of that handler. That method, through some skipping and jumping, checks all the event receivers for a list. If any of those event receivers is of type SPEventReceiverType.EmailReceived, then that receiver is fired. Hang on here, I can hear you say, I have worked with list event receivers before, but there is no EmailReceived method to override! And if you actually said that, you would be absolutely right (and I would have hearing that would rival Superman). The SPListEventReceiver class has no such method. However, the SPEmailEventReceiver class does. With that knowledge, we can create a receiver to manage adding items to our custom list. Check out Figure 6-3.
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Figure 6-3. Sample EmailEventReceiver code Great, we are getting close, but I don t smell cigar smoke yet. We still need to connect that event receiver to our list. We might use a feature to this, but heck, since we re already in code land, we might as well create a console application to do the work for us. What you would need to add to the basic console application in Visual Studio, besides the rather obvious reference to Microsoft.SharePoint.dll, would be the following code: static void Main(string[] args) { string site_name = "http://lab-s02:10000/"; string list_name = "emailcustomlist"; using (SPSite site = new SPSite(site_name)) { using (SPWeb web = site.OpenWeb()) { SPList list = web.Lists[list_name]; list.EventReceivers.Add( SPEventReceiverType.EmailReceived, "YOUR ASSEMBLY INFO GOES HERE",
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"EMailEnabledCustomList.EmailCustList"); } } } Note that in the code you would replace the site_name and list_name with information from your site and also replace the YOUR ASSEMBLY INFO GOES HERE with your five-part strong name for your assembly. But you knew that. Once we run this application, something strange and wonderful happens. If you go to your list in the web interface, guess which new setting is available on the List Settings page. If you get tired of guessing, check out Figure 6-4.
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Figure 6-4. Voil ! We have just solved one of the great mysteries of SharePoint, and with the right knowledge, all it took was a single line of code to register the right event handler. Of course, your actual event handler may be as complex as you need, but you get the point here.
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Note If you intend to debug this baby, remember what I said about incoming email handling being done
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by the timer job. Attach to OWSTIMER.exe rather than w3wp.exe if you want to step through your code.
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It s time to move on; we have more secrets to discover.
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List Templates
Now that you know how to create lists from templates, it is time to start exploring these templates and how you can use them to customize the user experience. List templates are defined in two ways, either in the site definition onet.xml file or in a feature. By now you probably know what I recommend, and if not, you haven t been paying attention and should go sit in the corner. The good news is that creating list templates in onet.xml and in features are very much the same. Although there are trade-offs with creating list instances in features, doing the same with list templates carries no such penalties. The bad news is that list templates can be quite complex. The ListTemplate element itself holds plenty of attributes, but the true complexity begins when we look at the list template definition file schema.xml. Let s begin.
Note Do not confuse list templates deployed with features with list templates saved from an existing list through the web interface. In this book we are talking only about list templates in the form of definitions of new lists, not saved list templates from the web interface.
ListTemplate Element
You will find the ListTemplate element in the ListTemplates section of the onet.xml file or in the elements file of a feature. Because the two list templates are similar, I will cover the attributes only once. Also, since complete coverage of all ListTemplate attributes would require too much space, I will focus on the most useful attributes from a user experience perspective.
Quite a lot of the attributes affect the list that is created from the template. Other attributes, such as Tip
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