Observablecollection not updating


11-Nov-2020 01:15

If everything goes to plan, on first load, on first load, we should see our “empty” message. Now if we add an item to the Observable Collection, the Items Control should update and we should see our newly added object.

No bueno - the UI isn’t updating; seemingly nothing has been added. The key here is the Visibility binding: If we remove this, suddenly everything clicks!

Not all collections change while the user is looking at them. Others are loaded from a database or server once, and then simply displayed. You have to decide exactly when and how to take these actions. When using linq, you declare what a collection will look like, how it will be filtered, mapped, and transformed. There are open-source projects like Bindable Linq that bridge the gap.

If the collection doesn’t change, don’t make it an Observable Collection. But without that extra help, people are often surprised when things don’t work. In the MVVM pattern, you bind a view to a view model.

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Service calls and persistence belong in the model layer, not the view model layer.So it stands to reason that Observable Collection belongs in the view model. Microsoft’s own code generators encourage us to make this mistake.



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