c# - How can an ObservableCollection fire a Replace action? -


in documentation of event args of notifycollectionchangedeventargs, there action called replace (in addition add, remove, move, etc.). when can fired? can't see replace method in observablecollection

here example:

observablecollection<string> mycollection = new observablecollection<string>; mycollection.add("one"); mycollection.add("two"); mycollection.add("three"); mycollection.add("four"); mycollection.add("five");  mycollection[4] = "six"; // replace (i.e. set)

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