4/8/2024 0 Comments Treeview example wpfWhen the BringIntoView method is called on a TreeViewItem control, the TreeViewItem and its parent TreeViewItem controls expand. When this property changes, an Expanded or Collapsed event occurs. You can also expand or collapse a TreeViewItem without any direct user action by setting the IsExpanded property to true (expand) or false (collapse). If the user expands a TreeViewItem, the IsExpanded property is set to true. If an item is not a TreeViewItem control, it is automatically enclosed by a TreeViewItem control when the TreeView control is displayed. For more information and an example, see Use SelectedValue, SelectedValuePath, and SelectedItem. To define the layout of a TreeViewItem control, you can also use HierarchicalDataTemplate objects. You can also specify an ItemsSource as a data source and then specify a HeaderTemplate and ItemTemplate to define the TreeViewItem content. The previous illustration demonstrates this method. If you are defining a TreeView by using Extensible Application Markup Language (XAML), you can explicitly define the Header content of a TreeViewItem control and the items that make up its collection. A TreeViewItem control is a HeaderedItemsControl that has a Header and an Items collection. The TreeView control contains a hierarchy of TreeViewItem controls. The following example creates a TreeView. TreeView is an ItemsControl that nests the items by using TreeViewItem controls. This topic introduces the TreeView and TreeViewItem controls, and provides simple examples of their use. The TreeView control provides a way to display information in a hierarchical structure by using collapsible nodes.
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