© 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. Have a look at the Table of contents to the right, where all the chapters. If youre brand new to WPF, then we recommend that you start from the first chapter and then read your way through all of it. This method simply creates a List and then calls the FindCheckedNodes method for the TreeView control's Nodes collection. Welcome to this WPF tutorial, currently consisting of 126 articles, where youll learn to make your own applications using the WPF UI framework. Return a list of the checked TreeView nodes.įindCheckedNodes(checked_nodes, trvMeals.Nodes) The following method wraps the call to FindCheckedNodes for the TreeView control. It checks each node and then recursively calls itself to check the node's children stored in its Nodes property. The method loops through the nodes in the collection. 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. One way to find the checked TreeView nodes is to recursively crawl over the tree's nodes and find them. 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. Die meisten Beispiele von TreeViews und WPF sind einfache Beispiele in denen die Knoten stets vom gleichen Typ sind. If you set a TreeView control's CheckBoxes property to true, then the control displays boxes that the user can check to select nodes. WPF-TreeView unterschiedliche Subknoten ein erweitertes Beispiel. 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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