ObservableCollection vs. List

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Interesting question, considering that both List and ObservableCollection implement IList<T> there isn’t much of a difference there, ObservableCollection also implements INotifyCollectionChanged interface, which allows WPF to bind to it.

One of the main differences is that ObservableCollection does not have AddRange method, which might have some implications.

Also, I would not use ObservableCollection for places where I know I would not be binding to, for this reason, it is important to go over your design and make sure that you are taking the correct approach in separating layers of concern.

As far as the differences between Collection<T> and List<T> you can have a look here
Generic Lists vs Collection

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