WPF - How can I implement an ObservableCollection<K,T> with a key (like a Dictionary)?

Someone already made it. I haven't try it yet but nothing to lose.

How about:

var collection = new ObservableCollection<KeyValuePair<TKey, TValue>>();

You should be able to address it with:

collection.First(x => x.Key == *your key value*) .Key or .Value