![]() ![]() In our case, weâve overridden ToString to display the dogâs name and age. We just have a TextBlock bound to the Dog instance as a whole, which causes the dogâs ToString method to get invoked. Note that we specify a DataType for each HierarchicalDataTemplate. As the tree is constructed, the appropriate template will be used, based on whether a node is a breed or a dog.Ä«elow, we can see how this will look at runtime. We also indicate that the tree should be expanded by looking at the Dogs property in each breed instance. ![]() We then include a template to use for each Breed item and a different template to use for each Dog item in the tree. In the example below, we have a TreeView whose ItemsSource is bound to a list of breeds. The class that owns it should be a viewmodel class, not your window/usercontrol. Two more things - not required, but a very good idea: Make it ObservableCollection rather than List, so that it will notify the UI of added or removed items.![]() Breed objects contain information about a breed and in turn have a Dogs property that is a list of individual dogs of that breed. Of whatever object is your TreeViews DataContext. Letâs assume that we have both a Breed and a Dog class. If you have some hierarchical data in which the items are not all of the same type, you can specify more than one HierarchicalDataTemplate for the TreeView, based on the underlying type of each node. This allowed us to specify the look and feel of each node in the tree and also dictated how the main data item would be traversed to generate the tree. I hope you have enjoyed it a lot.I showed last time how to use a HierarchicalDataTemplate as the ItemTemplate for a TreeView. we also learn how to style a treeview using xaml. In the above, we saw the various code example in XAML and C# for WPF TreeView, hierarchical and custom treeview. To customize the appearance of a TreeViewItem control, set the Style property to a custom Style.The following example shows how to set the Foreground and FontSize property values for a TreeViewItem control by using a Style. WPF Styles are used to change appearance of any WPF Control. It basically displays a checkbox and image control in the hierarchy. The following code example creates a custom TreeView control by modifying the TreeViewItem control. TreeViewItem2_3.Items.Add(treeViewItem2_3_3) TreeViewItem treeViewItem2_3_3 = new TreeViewItem() TreeViewItem2_3.Items.Add(treeViewItem2_3_2) TreeViewItem treeViewItem2_3_2 = new TreeViewItem() TreeViewItem2_3.Items.Add(treeViewItem2_3_1) TreeViewItem treeViewItem2_3_1 = new TreeViewItem() ![]() TreeViewItem treeViewItem2_3 = new TreeViewItem() TreeViewItem2_2.Items.Add(treeViewItem2_2_1) TreeViewItem treeViewItem2_2_1 = new TreeViewItem() TreeViewItem treeViewItem2_2 = new TreeViewItem() TreeViewItem2_1.Header = "Kailash Behera" TreeViewItem treeViewItem2_1 = new TreeViewItem() TreeViewItem1_3.Items.Add(treeViewItem1_3_3) TreeViewItem treeViewItem1_3_3 = new TreeViewItem() TreeViewItem1_3.Items.Add(treeViewItem1_3_2) TreeViewItem treeViewItem1_3_2 = new TreeViewItem() TreeViewItem1_3.Items.Add(treeViewItem1_3_1) TreeViewItem treeViewItem1_3_1 = new TreeViewItem() TreeViewItem treeViewItem1_3 = new TreeViewItem() TreeViewItem1_2.Items.Add(treeViewItem1_2_1) TreeViewItem treeViewItem1_2_1 = new TreeViewItem() TreeViewItem treeViewItem1_2 = new TreeViewItem() TreeViewItem1_1.Header = "Kailash Behera" TreeViewItem treeViewItem1_1 = new TreeViewItem() The following two code example creates a hierarchical TreeView control using XAML and C# code. WPF TreeView Example Hierarchical WPF TreeView TreeViewItem treeViewItem2 = new TreeViewItem() TreeViewItem treeViewItem1 = new TreeViewItem() The following example creates the same TreeView in c# what we have created using the XAML code Like other WPF controls WPF TreeView can also be created at run time using C# code. WPF TreeView Example Create a WPF TreeView using C# The following example creates a simple TreeView using the XAML code. To define the layout of a TreeViewItem control, you can also use HierarchicalDataTemplate objects. The ItemsSource can be specified for TreeView control as a data source and then specify a HeaderTemplate and ItemTemplate to define the TreeViewItem content. If an item is not a TreeViewItem control, it is automatically enclosed by a TreeViewItem control when the TreeView control is displayed. A TreeViewItem control is a HeaderedItemsControl that has a Header and an Item collection. WPF TreeView is an ItemsControl that nests the items by using TreeViewItem controls in a hierarchy structure. We will see a code example of loading XML content into WPF TreeView. This blog introduces the TreeView and demonstrates how to create TreeView, add a child using XAML and C# language. The WPF TreeView control provides a way to display information in a hierarchical structure by using collapsible nodes. ![]()
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