![]() Arbitrary types of content in a TreeViewItem.TreeViewItem as the root of the TreeView item template.Data binding to the ItemsSource property on TreeView and TreeViewItem.The TreeView APIs support the following features: For example, if you show a file system hierarchy, you could use folder icons for the parent notes and file icons for the leaf nodes. You can include an icon in the tree view item data template to represent nodes. Collapsed nodes use a chevron pointing to the right, and expanded nodes use a chevron pointing down. The tree view uses a combination of indentation and icons to represent the nested relationship between parent nodes and child nodes. It can be used to illustrate a folder structure or nested relationships in your UI. All rights reserved.The tree view control enables a hierarchical list with expanding and collapsing nodes that contain nested items. © 2009-2023 Rocky Mountain Computer Consulting, Inc. If you build them first, post a comment below.ĭownload the example to experiment with it and to see additional details. Two enhancements I can think of would be to display appropriate images for different file types and to provide a context menu so, for example, the user can open or delete a file. In this example, that's a little picture of a document. If the file_img parameter is at least 0, the method sets the new nodes' ImageIndex properties so they display the file image. This makes the directory's subdirectories come before the directory's files.įinally, the method loops through the directory's files, adding nodes below the directory's node. Next, the method loops through the directory's subdirectories, recursively calling AddDirectoryNodes for each. In this example, folders display a little folder image. If the folder_img parameter is at least 0, then the method sets the node's ImageIndex property to that value so the node displays an image. (This allows a program to add multiple top-level directories to the TreeView if desired.) Otherwise it adds the new node below the parent node. If the parent parameter is null, it adds the node to the TreeView control's Nodes collection. This method creates a TreeView node to represent the directory. If (file_img >= 0) file_node.ImageIndex = file_img ![]() TreeNode file_node = dir_(file_info.Name) If (folder_img >= 0) dir_node.ImageIndex = folder_img įoreach (DirectoryInfo subdir in dir_info.GetDirectories())ĪddDirectoryNodes(trv, subdir, dir_node, folder_img, file_img) įoreach (FileInfo file_info in dir_info.GetFiles()) If (parent = null) dir_node = (dir_info.Name) Įlse dir_node = (dir_info.Name) ![]() Public static void AddDirectoryNodes(TreeView trv,ĭirectoryInfo dir_info, TreeNode parent, int folder_img, int file_img) Add this directory's node and sub-nodes. It then calls the following AddDirectoryNode method. This method creates a DirectoryInfo object to represent the directory that should be loaded into the TreeView. String directory, int folder_img, int file_img)ĭirectoryInfo dir_info = new DirectoryInfo(directory) ĪddDirectoryNodes(trv, dir_info, null, folder_img, file_img) ![]() Public static void LoadFromDirectory(this TreeView trv, Initialize the TreeView from a directory, This example adds the following LoadFromDirectory extension method to the TreeView control. Title: Initialize a TreeView control to display a directory hierarchy in C# C# Helper: Initialize a TreeView control to display a directory hierarchy in C#
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