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WPF ObservableCollection implementation details

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Are ObservableCollections in WPF implemented as linked lists or as arrays?

Basically, is random access into an ObservableCollection constant time?

(Yes, I've googled; can find no discussion of this anywhere. I need to maintain an ObservableCollection in sorted order and am trying to figure out if it is worth it to do a binary search)

Edited by jwezorek

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