Checkbox and item are separate controls, such that user can select an item, which will display and image without checking the checkbox. Be able to check all children when parent is checked, but parent should not be checked (i do not require a three state) when children are checked. The sample code in this post uses a view model that exposes a single collection of Country objects with each country having a property named IsSelected of type System. Keep the data structured as as a Dictionory if possible. It should appear checked if all related checkboxes are checked, unchecked if none of the related checkboxes are checked, or in an indeterminate state if only some of the related CheckBox controls are checked: This post provides an example on how you can use a three-state Checkbox control to set the IsChecked property of several other related CheckBoxes in a data-bound ItemsControl, or any other control that derives from the ItemsControl such as the DataGrid, ListView or TreeView controls, in WPF using the MVVM (Model-View-ViewModel) pattern.īy setting the IsThreeState property of a CheckBox control to true, the IsChecked property can also be set to NULL as a third state in addition to the two default ones true and false.Ī three-state CheckBox is usually used to reflect an overall state of some other related checkboxes. All rights reserved.How to bind a three-state CheckBox to some other CheckBoxes in a data-bound ItemsControl in WPF using MVVM Posted: J| Author: Magnus Montin | Filed under: MVVM, WPF | Tags: MVVM, WPF, XAML | 1 Comment © 2009-2023 Rocky Mountain Computer Consulting, Inc. The code that displays the list is straightforward so it isn't shown here.ĭownload the example to experiment with it and to see additional details. List checked_nodes = CheckedNodes(trvMeals) When you click the program's Show Checked button, it uses the following code to get the list of checked TreeView nodes. This method simply creates a List and then calls the FindCheckedNodes method for the TreeView control's Nodes collection. Return a list of the checked TreeView nodes.įindCheckedNodes(checked_nodes, trvMeals.Nodes) Use the TreeViewControl. The following method wraps the call to FindCheckedNodes for the TreeView control. You can display check boxes to allow users to check/uncheck individual nodes. It checks each node and then recursively calls itself to check the node's children stored in its Nodes property. Just make sure the data template is within the scope of your tree (e.g. The method loops through the nodes in the collection. This is the classic WPF way: Rather than styling an UI element (TreeViewItem), you define a DataTemplate for the bound item that is represented by the tree node (in the sample: ShopCategory instances). It also takes as a parameter a TreeNodeCollection. The method takes as a parameter a List where it will place the checked TreeView nodes. If (node.Checked) checked_nodes.Add(node) įindCheckedNodes(checked_nodes, node.Nodes) List checked_nodes, TreeNodeCollection nodes) Return a list of the TreeNodes that are checked. This example uses the following method to build a list of the checked TreeView nodes. To enumerate every node in the tree, you can write a method that enumerates the nodes within a TreeNodeCollection and their descendants in the tree. That property has type TreeNodeCollection, and it contains the control's top-level nodes.Įach node in the tree has a similar Nodes property that contains its child nodes. The TreeView control has a Nodes property. However, their tri-state logic implementation is designed to. The RadTreeView control supports check boxes/radio buttons elements next to each item out-of-the-box. This tutorial will guide you through the process of implementing a tri-state CheckBox functionality in the RadTreeView using MVVM. One way to find the checked TreeView nodes is to recursively crawl over the tree's nodes and find them. Implement a Tri-State CheckBox logic using MVVM. After all, the ListBox control provides five properties that help you figure out which items are selected: SelectedIndex, SelectedIndices, SelectedItem, SelectedItems, and SelectedValue. In fact, it doesn't even have a simple way to enumerate the control's nodes so you can see which ones are checked. Strangely the TreeView control doesn't provide a simple method for finding the checked TreeView nodes. In that case you will probably need to find the checked TreeView nodes at some point. If you set a TreeView control's CheckBoxes property to true, then the control displays boxes that the user can check to select nodes. Title: Make a list of checked TreeView nodes in C# C# Helper: Make a list of checked TreeView nodes in C#
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