How to remove NewItemPlaceholder at TreeView wpf

Question

I bind ObservableCollection to ListView and I get {NewItemPlaceholder} line at the end. How can I hide or remove that line?

Answer 1

Just set an ItemTemplate in the XAML for the ListView (in my example a TreeView, where the same failure happens), and bind it to a filter converter. This could look like this:

Now you have to add a Filter-Converter-Class like this:

class IgnoreNewItemPlaceholderConverter : IValueConverter {
    public static readonly IgnoreNewItemPlaceholderConverter Instance = new IgnoreNewItemPlaceholderConverter();

    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) {
        if (value != null && value.ToString() == "{NewItemPlaceholder}")
            return DependencyProperty.UnsetValue;
        return value;
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) {
        throw new NotImplementedException();
    }
}

And don't forget to map this Filterclass a static resource in your XAML with something like this:

This is caused by a DataGrid beeing bound to the same datasource, that is not "IsReadOnly=True" (writable). If this still fits your requirements, you can also try to make the DataGrid readonly or to bind to a different datasource.