The steps below are about binding to TreeView in MVVM way. ( 'MasterDetailTemplate', dataTemplate) myTreeView.ItemTemplate myWindow.Resources 'MasterDetailTemplate' as HierarchicalDataTemplate Refer the dynamically created data template as DynamicResource in XAML. In the example below, we have a TreeView whose ItemsSource is bound to a list of breeds. I skip the part about MVVM division, its a theme for separate article. The 2 most difficult problems for me became MVVM approach itself, and then MVVM binding to TreeView control. These two properties are then hooked up to the TreeView, using a couple of styles targeting the TreeViewItem, inside of the ItemContainerStyle for the TreeView. If null is returned, TreeView searches for appropriate hierarchical data template for the DataType. I decided to implement it using WPF and pure MVVM (both were absolutely new things for me). The basic principle is to implement two extra properties on your data class: IsExpanded and IsSelected. So, you need to apply this style on your listbox or any control where this Hierarchichal data template gets applied. ![]() Return mi.Invoke(container, new object ) as DataTemplate īasically what it does is to find appropriate data template and return it back to TreeView. Since you applied the style to the ItemContainer and as the name suggests it will be applied to the items it contains which in this case will be the child nodes of folder. In the following example, Ill show you just how easy it is to get started with the HierarchicalDataTemplate: In the XAML markup, I have specified a HierarchicalDataTemplate for the ItemTemplate of the TreeView. If (MainWindow.ViewMode = ViewMode.ByArea) MethodInfo mi = container.GetType().GetMethod("FindResource") as MethodInfo Public override DataTemplate SelectTemplate(object item, DependencyObject container) Your ViewModel will require a collection of children, and you will use the simply bind the ItemsSource property of the HierarchicalDataTemplate to that collection. In the following example, business object is displayed as CheckBox. Todo this you will be using a HierarchicalDataTemplate. Since TreeViewAdv displays the hierarchical data, the HierarchicalDataTemplate is used to define the ItemTemplate. Public class MyTemplateSelector : DataTemplateSelector The user can customize the business object that has to be displayed as TreeViewItemAdv using the ItemTemplate of TreeViewAdv. ![]() In a code behind file, the following class is defined. Since TreeView only selects one unique data template at a time for any given type, the sample above is using custom data template selector in ItemTemplateSelector. For view, Area is parent and Age is child node type and vice versa for view. If you look at below example, you can see that each category view has different data templates. ![]() In a XAML, we can add different hierarchical data templates per each category.
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