WPF TreeView bound to ObservableCollection not updating root nodes

Question

Sorry - my question is almost identical to this one but since it didn\'t receive a viable answer, I am hoping that someone else has some fresh ideas.

I have a WPF Tr

Answer 1

My initial guess is that you have something like the following for the root node:

public ObservableCollection Entities
{
    get;
    set;
}

Then, instead of doing something [good] like the following:

Entities.Clear();
foreach (var item in someSetOfItems)
    Entities.Add(item);

You are doing something [bad] like this:

Entities = new ObservableCollection(someSetOfItems);

You should be able to track down the issue by making the backing field of the Entities property readonly:

private readonly ObservableCollection _entities
    = new ObservableCollection();

public ObservableCollection Entities
{
    get
    {
        return _entities;
    }
}