However, because the SelectedValuePath of this TreeView is set to EmployeeNumber, the SelectedValue is set to the EmployeeNumber. When you select an EmployeeName in the TreeView, the SelectedItem property returns the EmployeeInfo data item that corresponds to the selected EmployeeName. The following example shows a TreeView that uses the previously defined HierarchicalDataTemplate and that sets the SelectedValue property to the EmployeeNumber. Note that the HierarchicalDataTemplate does not specify the EmployeeNumber as part of the template. The following example defines a HierarchicalDataTemplate that displays the EmployeeName and EmployeeWorkDay of the Employee. The following example shows an XmlDataProvider that contains employee information. The examples in this topic illustrate this concept. The SelectedValuePath property specifies the path to the property that is used to determine the value of the SelectedValue property. The SelectedItem represents an object in the Items collection and the TreeView displays the value of a single property of the selected item. Create new WPF application and name it as TreeViewMVVMBinding. Let’s take an example of populating employees’ details per position per department in hierarchical pattern. The SelectedValuePath property provides a way to specify a SelectedValue for the SelectedItem in a TreeView. Today, in this article, we will learn how to populate hierarchical data in TreeView in WPF using MVVM architecture. Because the data is recursive, the HierarchicalDataTemplate can be applied to each level.This example shows how to use the SelectedValue and SelectedValuePath properties to specify a value for the SelectedItem of a TreeView. Each Employee element can contain other Employee elements to indicate who reports to whom. The TreeView binds to XML data that represents the employees in a company. The following example demonstrates how to bind a TreeView to hierarchical data and use a HierarchicalDataTemplate to specify the ItemsSource for each TreeViewItem. By using a HierarchicalDataTemplate, you can recursively set the ItemsSource for each TreeViewItem in the TreeView. Obviously, this article aims at intermediate and advanced WPF users. I do not discuss MVVM here since tons of information can be found on the web. When you set the HierarchicalDataTemplate.ItemsSource property, that value is used when the HierarchicalDataTemplate is applied. For example: Simplifying the WPF TreeView by Using the ViewModel Pattern I use TreeView + HierarchicalDataTemplate with multi-level binding because it is one of the least understood XAML binding topics. The HierarchicalDataTemplate enables you to specify the ItemsSource for a TreeViewItem, or any HeaderedItemsControl, on the data template. For example, if you set the ItemTemplate property on a data-bound TreeView, each TreeViewItem that is generated uses the DataTemplate that was assigned to the ItemTemplate property of the TreeView. When you set the ItemsControl.ItemTemplate property and if the ItemsControl generates an ItemsControl for each child item, then the child ItemsControl uses the same ItemTemplate as the parent. If the data is represented in a way that is not hierarchical, you must build a hierarchical representation of the data. For example, an Employee class might contain a collection of Employee objects that are the direct reports of an employee. The data source must have a hierarchical object model. This can occur when the data is recursive in nature, such as a file system, where folders can contain folders, or a company's organizational structure, where employees have other employees as direct reports. There might be times when you want to bind a TreeView to a data source whose depth is not known.
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