Treeview example wpf4/3/2024 Project format is currently VS2008 only, but binaries which target. However: The library comes with a sample project that shows pretty much all features of the control. I’m planning to write a CodeProject article for this one, but for now, it’s only available through my place without a tutorial. get the parent category, or null if it's a root category public override ShopCategory GetParentItem(ShopCategory item) returns subcategories that should be available through the tree public override ICollection the sample uses the category's name as the identifier public override string GetItemKey(ShopCategory item) Here’s the complete implementation of the sample application’s tree control: //a tree control that handles only ShopCategory objects public class CategoryTree : TreeViewBase How to access a bound item’s parent, if there is one.How to access a bound item’s childs, if there are any.How to generate an identifier for a given tree node.However, you’ll probably manage with 3 lines of code, as the base control just needs to know 3 things: This means you have to write a little code yourself. AutoCollapse feature / ExpandAll / CollapseAll methodsĪll this goodness comes at a price: The TreeViewBase class that provides this functionality, is abstract.Access to tree nodes (TreeViewItem) through bound items.Tree layout can be cached, saved and reapplied.Simple styling on every level: Tree, TreeViewItem, or bound items (via DataTemplates).Optional root node which is not dependent on the tree’s bound items.Convenient context menu handling for tree nodes.The left side bar of Windows Explorer is an example of a TreeView. This allows either virtualized trees in case getting data is expensive, or low memory trees that keep the number of tree nodes at a minimum. 18 WPF TreeViewTutorial.zip Introducing WPF TreeView A TreeView represents data in a hierarchical view in a parent child relationship where a parent node can be expanded or collapsed. Also provides the option to automatically clear invisible tree nodes. Lazy loading support – does not create tree nodes until the parent node is expanded.SelectedItem is of type Product - no casts required bind flat list of business objects to tree Here’s the tree’s main features at a glance: However, instead of posting a rant that probably nobody would ever read (let alone care about), I worked on an alternative. Furthermore, WPF’s TreeView tends to fire all sorts of SelectedItemChanged events if it’s being refreshed or rebound, which caused side-effects with TwoWay data binding. I became aware of the default control’s limitations during my last project – I naturally started with hierarchical data templates, but was soon confronted with quite a few issues: I missed a simple API to control the tree, and styling of the tree’s nodes proved hard as well. This is a little something I’ve been working on for a while: A replacement (or better: enhancement) of WPF’s built-in TreeView control. I’ll update the CodeProject article once the current filtering mechanism has been rewritten:ĭownload: wpf-treeview.zip (Current version: 1.0.7, updated 2008.04.06) Update: The latest version is currently only available through the download link below. In essence each of the objects in the hierarchy above with different letters are different types of objects which all inherit from an abstract class to share common. And please leave your rating if you like the control □ I am trying to use WPF TreeView to create a hierarchy in my application, I am trying to create a hierarchy as follows: Obj A -Obj B -Obj C -Obj D -Obj E -Obj D -Obj E. However, because the SelectedValuePath of this TreeView is set to EmployeeNumber, the SelectedValue is set to the EmployeeNumber.A tutorial is now available on Code Project, so check the article for a detailed overview. 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. The SelectedValuePath property provides a way to specify a SelectedValue for the SelectedItem in a TreeView. This example shows how to use the SelectedValue and SelectedValuePath properties to specify a value for the SelectedItem of a TreeView.
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