Question

New to WPF and also the ObservableCollection I need to sort it in my own way, and keep it sorted everytime something adds or removes from it.

ObservableCollection<User> users = new ObservableCollection<User>();

The user object is like so :

class User
{
    public string Name { get; set; }
    public bool IsOp { get; set; }
    public bool IsAway { get; set; }
}

I would like all the IsOp's at the top of the list, in alphabetical order. Then all the non-ops in alphabetical order following them.

What is the correct way to achieve this?

Many thanks in advance.

Answer 1

The easiest way is to use a CollectionView:

ICollectionView view = CollectionViewSource.GetDefaultView(users);
view.SortDescriptions.Add(new SortDescription("IsOp", ListSortDirection.Descending));
view.SortDescriptions.Add(new SortDescription("Name", ListSortDirection.Ascending));

When you will bind the view to that list, the items will appear in the specified order.

Using the trick shown here, you can even use Linq:

var query =
    from u in users.ShapeView()
    orderby u.IsOp descending, u.Name ascending
    select u;

query.Apply();