How do I update an IValueConverter on CollectionChanged?

Question

Here\'s a basic example to explain my problem. Let\'s say I have

ObservableCollection Numbers {get; set;}

and an IValueConverte

Answer 1

In your model, subscribe to CollectionChanged and raise PropertyChanged:

Numbers.CollectionChanged += (o,e) => 
  OnPropertyChanged(new PropertyChangedEventArgs(nameof(Numbers)));

And, as thomasgalliker mentioned, you should unsubscribe from the event when the model containing the connection is no longer used.