treeview

Populate TreeView with file system directory structure

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Option #1: Recursive approach: private void ListDirectory(TreeView treeView, string path) { treeView.Nodes.Clear(); var rootDirectoryInfo = new DirectoryInfo(path); treeView.Nodes.Add(CreateDirectoryNode(rootDirectoryInfo)); } private static TreeNode CreateDirectoryNode(DirectoryInfo directoryInfo) { var directoryNode = new TreeNode(directoryInfo.Name); foreach (var directory in directoryInfo.GetDirectories()) directoryNode.Nodes.Add(CreateDirectoryNode(directory)); foreach (var file in directoryInfo.GetFiles()) directoryNode.Nodes.Add(new TreeNode(file.Name)); return directoryNode; } Option #2: Non-recursive approach: private static void ListDirectory(TreeView treeView, … Read more

How to get TreeViewItem from HierarchicalDataTemplate item?

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TreeViewItem item = (TreeViewItem)(mainTreeList .ItemContainerGenerator .ContainerFromIndex(mainTreeList.Items.CurrentPosition)); DOES NOT WORK (for me) as mainTreeList.Items.CurrentPosition in a treeview using a HierarchicalDataTemplate will always be -1. NEITHER DOES below as as mainTreeList.Items.CurrentItem in a treeview using a HierarchicalDataTemplate will always be null. TreeViewItem item = (TreeViewItem)mainTreeList .ItemContainerGenerator .ContainerFromItem(mainTreeList.Items.CurrentItem); INSTEAD I had to set a the last selected TreeViewItem … Read more

WPF Treeview Databinding Hierarchal Data with mixed types

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Since you want the elements in the TreeView to have a list of children that consists of both Categories Products, you will want your Category ViewModel to have a collection that consists of both Categories and Products. For example, you could use a CompositeCollection to combine your existing collections: public class Category { public string … Read more

WPF MVVM TreeView SelectedItem

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You should not really need to deal with the SelectedItem property directly, bind IsSelected to a property on your viewmodel and keep track of the selected item there. A sketch: <TreeView ItemsSource=”{Binding TreeData}”> <TreeView.ItemContainerStyle> <Style TargetType=”{x:Type TreeViewItem}”> <Setter Property=”IsSelected” Value=”{Binding IsSelected}” /> </Style> </TreeView.ItemContainerStyle> </TreeView> public class TViewModel : INotifyPropertyChanged { private static object _selectedItem … Read more

How to avoid winforms treeview icon changes when item selected

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Simply set the SelectedImageIndex for each node to the same value as ImageIndex. So, if you’re creating your node programatically: TreeNode node = new TreeNode(“My Node”); node.ImageIndex = 1; node.SelectedImageIndex = 1; Or you can specify the whole lot in the constructor: TreeNode node = new TreeNode(“My Node”, 1, 1); You can do the same … Read more

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