Question

I’m using ListBox with custom ItemsSource:

this.ListOfPersonsListBox.ItemsSource = (List<Person>)ListOfPersons.AllPersons;

ListOfPersons is a static class so it cannot implement INotifyPropertyChanged nor IObservableCollection.

What’s the simplest way to redraw my ListBox after updating the list? My current code works, but I would like to find a cleaner solution:

    private void SyncButton_Click(object sender, EventArgs e)
    {
        ListOfPersons.Sync();
        this.ListOfPersonsListBox.ItemsSource = null;
        this.ListOfPersonsListBox.ItemsSource = ListOfPersons.AllPersons;
    }

Answer 1

Consider using an ObservableCollection instead of a List. It implements INotifyPropertyChanged internally. You can loop through your list and add each element to a new ObservableCollection object and bind this to the ListBox.

If you’re going to convert often, you could just create an Extension method

public static ObservableCollection<T> ToObservableCollection<T>(this IEnumerable<T> myList)
{
    var oc = new ObservableCollection<T>();
    foreach (var item in myList)
        oc.Add(item);
    return oc;
}