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CHAPTER 6 WHAT LURKS IN THE FOREST OF LISTS
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So, is there any hope of getting a custom list email enabled Oh yes, in fact, the CanReceiveEmail property reveals a vital clue. Not only does it check for the template types in the previous list, but it also checks whether the list has the Boolean property HasExternalEmailHandler set to true. To understand what this means, we need to dig a bit deeper.
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Even though we cannot directly receive email to a custom list without some custom development, we Tip sure as heck can work around the issue. I have written an online article series on business process automation in SharePoint that details how you can use an intermediary announcement list and a simple workflow to put an email into a custom list. The three-part article series is available at http://www. understandingsharepoint.com/url/10001. Or you could just read on to find out how you can email enable custom lists.
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If you need your boss to understand what happens when you send an email to the list, tell her or him that you get a new item created in the list. The title of that item is set to the subject of the email, and the body is set to the contents. For document libraries, including the picture library, you can send files directly to the library, and they will be added to the library. This explanation should reveal an interesting clue to our problem. If incoming email is handled differently in a library than in another type of list, then there must be some functionality determining how incoming email is handled that differs between these list types. The handling of incoming email is done by a SharePoint timer job that runs every minute. The job itself eventually calls a method, SPIncomingEmailServiceInstance.ProcessEmail, which iterates through the incoming emails to figure out where that email should be placed. It does so by calling a stored procedure, proc_getEmailEnabledListByAlias, which retrieves the list to which the alias is bound, and then gets a handler that will be responsible for storing the email correctly. The following shows the GetHandler function of the SPEmailHandler class: public static SPEmailHandler GetHandler(SPList list) { if (!list.HasExternalEmailHandler) { switch (list.BaseTemplate) { case SPListTemplateType.DocumentLibrary: case SPListTemplateType.PictureLibrary: case SPListTemplateType.XMLForm: return new SPDocLibEmailHandler(list); case case case case SPListTemplateType.Survey: SPListTemplateType.Links: SPListTemplateType.Contacts: SPListTemplateType.Tasks: goto Label_007D;
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case SPListTemplateType.Announcements:
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CHAPTER 6 WHAT LURKS IN THE FOREST OF LISTS
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return new SPAnnouncementsEmailHandler(list); case SPListTemplateType.Events: return new SPCalendarEmailHandler(list); case SPListTemplateType.DiscussionBoard: return new SPDiscussionEmailHandler(list); case SPListTemplateType.Posts: return new SPBlogPostEmailHandler(list); } } else { return new SPExternalEmailHandler(list); } Label_007D: return null; } As you can see, there are different types of handlers for the incoming emails, depending on the type of list or library. You will recognize the list template types in the earlier list. Note also that if the list template type is Survey, Links, Contacts, or Tasks, SharePoint will purposely deny any attempt at sending email by returning a null object, which in turn prevents any handling of the email. There s another strange thing, especially when you read on. If you check the last else bracket in the previous code (snippet), you also see that if no handler can be found, a default SPExternalEmailHandler is returned. So, if there is a defaulthandler called SPExternalEmailHandler, could we utilize that to get our custom list email enabled Let s see.... The SPExternalEmailHandler class inherits from the SPEmailHandler class. The SPEmailHandler class defines an abstract method called ProcessMessage that will be called for each message in the current batch. The ProcessMessage method is what does the heavy lifting of getting an email message into a list. Although the email handler for libraries is obfuscated in the DLL, we can peek into the other handlers to see what Microsoft was thinking.
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I do recommend you take a stroll down the email handler lane with .NET Reflector to see how Tip Microsoft has done its handlers, because you will discover why there are different handlers for each of the different template types. For now, let s keep our goal in view and get our custom list email enabled.
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Caution I am sure you read 5 and remember this, but just in case you were a bit tired and don t remember: do not touch any of the default files that ship with Windows, including the database tables, stored procedures, database views, or anything else. Just don t.
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