SortedSet with INotifyPropertyChanged

Question

I have something like this:

public class CPerson: INotifyPropertyChanged
public class CPeople: SortedSet<CPerson>
public class CMain
{
    private CPeople _people;
}

I want to know in CMain if something was changed in CPeople, new person was added or deleted or something was changed in some CPerson in CPeople, i have implemented INotifyPropertyChanged on CPerson but i don't have any brilliant idea what interface implement on CPeople class and how in good way get out PropertyChanged event over CPeople to CMain.

Can anyone help me? Greetings.

Answer 1

I would use ObservableCollection<Person>. If you really need a SortedSet, you can also implement the INotifyCollectionChanged and INotifyPropertyChanged interfaces yourself.

One way you could go forward could be to create your collection class wrapped around SortedSet, like so:

public class ObservableSortedSet<T> : ICollection<T>, 
                                      INotifyCollectionChanged, 
                                      INotifyPropertyChanged
{
    readonly SortedSet<T> _innerCollection = new SortedSet<T>();

    public IEnumerator<T> GetEnumerator()
    {
        return _innerCollection.GetEnumerator();
    }

    IEnumerator IEnumerable.GetEnumerator()
    {
        return GetEnumerator();
    }

    public void Add(T item)
    {
        _innerCollection.Add(item);
        // TODO, notify collection change
    }

    public void Clear()
    {
        _innerCollection.Clear();
        // TODO, notify collection change
    }

    public bool Contains(T item)
    {
        return _innerCollection.Contains(item);
    }

    public void CopyTo(T[] array, int arrayIndex)
    {
        _innerCollection.CopyTo(array, arrayIndex);
    }

    public bool Remove(T item)
    {
        _innerCollection.Remove(item);
        // TODO, notify collection change
    }

    public int Count
    {
        get { return _innerCollection.Count; }
    }

    public bool IsReadOnly
    {
        get { return ((ICollection<T>)_innerCollection).IsReadOnly; }
    }

    // TODO: possibly add some specific methods, if needed

    public event NotifyCollectionChangedEventHandler CollectionChanged;
    public event PropertyChangedEventHandler PropertyChanged;
}