Question

I’m binding an UltraTree control (version 10.3) to a custom data source, like so:

public void Populate(List<FilterDimension> data)
{
    DataBindings.Clear();
    DataSource = data;
    Nodes[0].DataColumnSetResolved.NodeTextColumn = Nodes[0].DataColumnSetResolved.Columns["DisplayText"];
}

My expectation is that changing the DisplayText property on any of the bound FilterDimension objects will cause the UltraTree node’s text to update. In reality, the text in the tree does not update, and the PropertyChanged event remains null indicating that the UltraTree doesn’t even listen for this notification. How do I get the UltraTree to listen for property changes in FilterDimension?

Here’s the relevant code from FilterDimension:

internal class FilterDimension : INotifyPropertyChanged
{
    private string _displayText = null;
    private string _name = null;

    private BindingList<string> _values = new BindingList<string>();

    /// <summary>
    /// Gets or sets the display friendly name.
    /// </summary>
    public string Name
    {
        get { return _name; }
        set
        {
            _name = value;
            FirePropertyChangedNotification("Name");
            if (_displayText == null) { FirePropertyChangedNotification("DisplayText"); }
        }
    }

    /// <summary>
    /// Gets or sets the display text that is used in TreeView nodes.  When null, uses the Name.
    /// </summary>
    public string DisplayText
    {
        get { return _displayText ?? Name; }
        set { _displayText = value; FirePropertyChangedNotification("DisplayText"); }
    }

    /// <summary>
    /// Gets a read/write list of values.  Is never null.
    /// </summary>
    public BindingList<string> Values
    {
        get { return _values; }
        set { _values = value ?? new BindingList<string>(); }
    }

    #region Events

    public event PropertyChangedEventHandler PropertyChanged;

    protected void FirePropertyChangedNotification(string propertyName)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }

    #endregion
}

Answer 1

It turns out that all I needed to do was change to BindingList<FilterDimension> instead of List<FilterDimension… I completely missed that the control expects notifications to bubble up from the list.