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public class NotifyCollectionChangedEventArgs<T>
private readonly NotifyCollectionChangedEventArgs _args;
public NotifyCollectionChangedEventArgs(NotifyCollectionChangedEventArgs args)
_args = args;
public IEnumerable<T> NewItems => _args.NewItems?.Cast<T>() ?? Enumerable.Empty<T>();
public int NewStartingIndex => _args.NewStartingIndex;
public IEnumerable<T> OldItems => _args.OldItems?.Cast<T>() ?? Enumerable.Empty<T>();
public int OldStartingIndex => _args.OldStartingIndex;
public NotifyCollectionChangedAction Action => _args.Action;
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