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CollectionChanged 이벤트를 수행하는 동안 ObservableCollection을 변경할 수 없습니다.
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Cannot change ObservableCollection during a CollectionChanged event.
Search by GoogleCollectionChanged 이벤트를 수행하는 동안 ObservableCollection을 변경할 수 없습니다.
Cannot change ObservableCollection during a CollectionChanged event.
Search by Google