private static void AddChildren(TreeNodeParent parent, ImplicitTemplateList templateList, object itemsSource)
{
var collection = itemsSource as IEnumerable;
if (collection != null)
{
foreach (var item in collection)
{
var node = new TreeViewNode();
var itemName = item.GetType().Name;
var template = templateList?.FirstOrDefault(x => string.Equals(x.DataTypeName, itemName));
var element = template.DataTemplate.LoadContent() as FrameworkElement;
element.DataContext = item;
node.Content = element;
// Implicitly bind the TreeViewNode's IsExpanded property to an IsExpanded property of the data item (=department in this sample)
// TODO: This is hardcoded and bad. Tried to create a Setter on the TreeViewItem Style like this:
// <Setter Property="IsExpanded" Value="{Binding IsExpanded,Mode=TwoWay}"/>, but it didn't do the trick.
var b = new Binding {
Source = item, Path = new PropertyPath("IsExpanded"), Mode = BindingMode.TwoWay
};
BindingOperations.SetBinding(node, TreeViewNode.IsExpandedProperty, b);
var itemsSourcePropertyName = (template as HierarchicalImplicitTemplate)?.ItemsSourcePropertyName;
if (itemsSourcePropertyName != null)
{
var propertyInfo = item.GetType().GetProperty(itemsSourcePropertyName);
if (propertyInfo == null)
{
throw new ArgumentException($"Property {itemsSourcePropertyName} not found on object of type {item.GetType().FullName}");
}
itemsSource = propertyInfo.GetValue(item);
AddChildren(new TreeNodeParent(node), templateList, itemsSource);
}
parent.Children.Add(node);
}
}
}
public static void SetTemplates(TreeView treeView, ImplicitTemplateList value)
{
treeView.SetValue(TemplatesProperty, value);
}