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MS Office Forum / Outlook / Programming Add-Ins / May 2008Registering events on calendar items on startup
I need to register for ItemEvents_10_BeforeDeleteEventHandler, ItemEvents_10_PropertyChangeEventHandler on any Calendar Event that is processed by my addin. For any calendar event handled by my addin, I mainatin the Outlook Id in a database, and also set a user-property on the outlook appt item. I know of 2 ways to register for these event handlers for all my calendar items. Question is which one is better. Can you please provide some insight. 1) On startup complete, I get a list of all calendar folders and iterate through every item in each of the folders looking for either my user-property being set, or if the outlook id matches ones in my database. For each such item, I register the event handlers. Problem I see here is that the add-in might take too long to load. Im not sure how many months/years of calendar appts are returned if I called GetDefaultFolder. 2) I register for ExplorerEvents_10_BeforeFolderSwitchEventHandler on all acitve explorers, and if the ToFolder is of type olAppointmentItem, then I register for this.Application.ActiveExplorer().SelectionChange += new Outlook.ExplorerEvents_10_SelectionChangeEventHandler. Then when the user selects an appointment Item, my callback can check if my user property is set, and if so register for the property-change and delete event handlers. problem with this approach is that my callback is being called on every folder change and also on every item selection in an appointment folder. Any suggestions on which approach is better? Thanks in advance. - Manish Both of the events you mention are Item level events, best handled by instantiating an Item and Inspector in the Inspectors.NewInspector() event handler. You check the item type in that handler for Inspector.CurrentItem.Class (use reflection for that) and if it's an appointment or meeting item (whatever you want to handle) instantiate your Item and Inspector objects. Most of us use lists of Inspector wrapper classes to handle multiple open items. In the wrapper class you instantiate the item event handlers you want. That's a much more isolated approach, each item in its own Inspector wrapper class and it keeps all the items in scope.  SignatureKen Slovak [MVP - Outlook] http://www.slovaktech.com Author: Professional Programming Outlook 2007 Reminder Manager, Extended Reminders, Attachment Options http://www.slovaktech.com/products.htm >I need to register for ItemEvents_10_BeforeDeleteEventHandler, > ItemEvents_10_PropertyChangeEventHandler on any Calendar Event that is [quoted text clipped - 29 lines] > > - Manish Hi Ken, Thanks for the response. I am using your suggested approach of having a list of inspector wrappers. I used the TraveAgency sample from MSDN to structure the code of my add-in. Although I do register for the events on the outlook item in the inspector class, thats not good enough because the user can modify the start-time, end-time, subject using the explorer view by dragging and dropping the appointment or deleting it. I need to be notified when this happens. So doing it at the inspector wrapper level is not sufficient. Which is why I have to either register events for all of my add-in's managed calender appointments or I have to register the events during item selection. Is my approach correct? > Both of the events you mention are Item level events, best handhled by > instantiating an Item and Inspector in the Inspectors.NewInspector() event [quoted text clipped - 41 lines] > > > > - Manish In that case registering for events you want for all items in the Selection collection would be the way to go to handle changes from in-cell editing. SignatureKen Slovak [MVP - Outlook] http://www.slovaktech.com Author: Professional Programming Outlook 2007. Reminder Manager, Extended Reminders, Attachment Options. http://www.slovaktech.com/products.htm > Hi Ken, > [quoted text clipped - 11 lines] > during item selection. > Is my approach correct? Thank you. > In that case registering for events you want for all items in the Selection > collection would be the way to go to handle changes from in-cell editing. [quoted text clipped - 14 lines] > > during item selection. > > Is my approach correct?
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