在WPF中使用带有ObservableCollection的HashSets

public class ObservableHashSet<T> : ObservableCollection<T>
{
    private readonly HashSet<T> _hashSet;

    public ObservableHashSet()
        : base()
    {
        _hashSet = new HashSet<T>();
    }

    public ObservableHashSet(IEnumerable<T> collection)
        : base(collection)
    {
        _hashSet = new HashSet<T>(collection);
    }

    public new void Add(T item)
    {
        if (_hashSet.Add(item))
        {
            base.Add(item);
        }
    }

    public new void Remove(T item)
    {
        if (_hashSet.Remove(item))
        {
            base.Remove(item);
        }
    }
}