После события CollectionChange.Add в семействе Items отсутствует добавленный элемент "<var>X</var>".Возможно, отправитель предоставил неверные данные в CollectionChangedEventArgs.

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After a CollectionChange.Add event, Items collection does not contain the added item '<var>X</var>'.This could happen if the event sender supplied incorrect information in CollectionChangedEventArgs.

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