treeview – Tarik Billa

Checkbox not visible on nodes of TreeView control when deployed in IIS

April 11, 2024 by Tarik

Not an answer yet, needed to show the images, well I tried the same, used this code in aspx: (I did not change any setting in IIS, nothing in aspx as well, created a plain solution >> added the treeview and deployed.) <asp:Content ID=”BodyContent” ContentPlaceHolderID=”MainContent” runat=”server”> <div> <asp:TreeView ID=”TreeTest” EnableClientScript=”true” PopulateNodesFromClient=”true” ExpandDepth=”0″ ShowLines=”true” ShowExpandCollapse=”true” ShowCheckBoxes=”Root” … Read more

How to filter a wpf treeview hierarchy using an ICollectionView?

January 9, 2024 by Tarik

This is how I filtered the items on my TreeView: I have the class: class Node { public string Name { get; set; } public List<Node> Children { get; set; } // this is the magic method! public Node Search(Func<Node, bool> predicate) { // if node is a leaf if(this.Children == null || this.Children.Count == … Read more

How to get Windows native look for the .NET TreeView?

January 6, 2024 by Tarik

You need to P/Invoke to call SetWindowTheme passing the window handle of the tree and use “explorer” as the theme. Paste the following code into a new class in your project, compile, and use this custom control instead of the built-in TreeView control. C#: public class NativeTreeView : System.Windows.Forms.TreeView { [DllImport(“uxtheme.dll”, CharSet = CharSet.Unicode)] private … Read more

Enable scroll for WPF Treeview

January 3, 2024 by Tarik

The TreeView control itself includes a ScrollViewer in its template. You should be able to just use a TreeView inside an appropriate host (not a StackPanel!).

Right click select on .Net TreeNode

December 31, 2023 by Tarik

Both left and right clicks fire a click event and cause the selection to change. However, in certain circumstances (that I haven’t yet bothered to trace down) the selection will change from the node that was right clicked to the originally selected node. In order to make sure that the right click changes the selection, … Read more

TreeNode Selected BackColor while TreeView not focused

December 14, 2023 by Tarik

If retaining the SystemColors.Highlight background color is all you wanted, then you don’t need to set the TreeView‘s DrawMode property to TreeViewDrawMode.OwnerDrawAll. Setting it to TreeViewDrawMode.OwnerDrawText should be sufficient, thus you don’t need to worry about drawing the TreeNode‘s corresponding ImageKey. Set the TreeView.DrawMode to TreeViewDrawMode.OwnerDrawText: treeView.DrawMode = TreeViewDrawMode.OwnerDrawText; Set the Treview.HideSelection to false, so … Read more

Scrolling in virtualized WPF TreeView is very unstable

December 7, 2023 by Tarik

To make the link more prominent, I am posting it in an answer too. It looks like a bug is within the framework code and there are no workarounds found yet. I have reported the bug on Microsoft Connect: Microsoft Connect: Scrolling in virtualized WPF TreeView is very unstable There is also a maybe related … Read more

How to select a node of treeview programmatically in c#?

December 3, 2023 by Tarik

Apologies for my previously mixed up answer. Here is how to do: myTreeView.SelectedNode = myTreeNode; (Update) I have tested the code below and it works: public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { treeView1.Nodes.Add(“1”, “1”); treeView1.Nodes.Add(“2”, “2”); treeView1.Nodes[0].Nodes.Add(“1-1”, “1-1”); TreeNode treeNode = treeView1.Nodes[0].Nodes.Add(“1-2”, “1-3”); … Read more

TreeView with columns

December 2, 2023 by Tarik

There are a number of sample controls to be found around the web: TreeViewAdv for .Net TreeView with Columns ContainerListView and TreeListView But the all-time favorite is probably the ObjectListView, which provides an expandable, multi-column ListView, along with many other incredibly handy features:

C# WinForms highlight treenode when treeview doesn’t have focus

September 25, 2023 by Tarik

What you are looking for is the HideSelection property on the TreeView. From MSDN: Gets or sets a value indicating whether the selected tree node remains highlighted even when the tree view has lost the focus. Link: http://msdn.microsoft.com/en-us/library/system.windows.forms.treeview.hideselection.aspx Code: TreeView.HideSelection = false;