Click here to Skip to main content
Click here to Skip to main content

Advanced TreeView for .NET

, 10 Jul 2006
Rate this:
Please Sign up or sign in to vote.
The TreeViewAdv control is designed to replace the standard .NET TreeView. It can do the same things, plus a number of advanced features like multi-selection or multi-column view.

TreeViewAdv in Multi-Column mode


Working on several different projects, I was needed to display and edit hierarchical data. Of course, the first thing you will do is to use the standard .NET TreeView control. It works pretty well if you only need basic features. But learning this control to do something more complex is not an easy job. I could not find an alternative TreeView control which is free and fully meets my needs, so finally I decided to write my own.

The architecture of this control comes mainly from the Java Swing component, with some modifications. These are the key features of the TreeViewAdv control:

  • Model-View architecture - Will be covered in a separate section of this article.
  • Multiselection - Maybe the first limitation which you will find in the standard TreeView is that it’s not possible to select more then one node.
  • Unlimited number of controls for each node - You can display three icons + a CheckBox + two Labels.
  • Multicolumns - You can split the TreeView into several columns.
  • Load on Demand - Lazy load of child nodes.
  • Drag & Drop highlighting - Dynamically highlight the drop position.
  • 100% pure .NET code - No WinAPI is used in this control.

The following screenshots illustrate the TreeViewAdv features:

Drag&Drop highlighting


Using ComboBox to edit node

Model-View Architecture

I really like the Model-View pattern, and decided to use it in this control. The main idea of this pattern is to split the model (business object) from its visualization (control). If the model changes, it notifies the view by firing corresponding events. The view asks the model for details, if needed, and displays the changes. The model is described by ITreeModelInterface:

public interface ITreeModel
    IEnumerable GetChildren(TreePath treePath);
    bool IsLeaf(TreePath treePath);

    event EventHandler<TreeModelEventArgs> NodesChanged; 
    event EventHandler<TreeModelEventArgs> NodesInserted;
    event EventHandler<TreeModelEventArgs> NodesRemoved; 
    event EventHandler<TreePathEventArgs> StructureChanged;

It’s very simple, and you need to implement only two methods. GetChildren should return the list of child nodes of the specified parent (empty for root nodes). IsLeaf method tells TreeView whether it should try to read child nodes of the specified parent. If you wish TreeView to dynamically track model changes, you need to use one of several events of the ITreeModel interface. The most common is the StructureChanged event, which cause the TreeView to fully refresh the specified node (or empty, for the whole model). For example, see the default implementation of the ITreeModel interface – the TreeModel class.

To specify the exact node in the model, TreePath class is used. It stores the path from the root to the node, in the FullPath property.

public class TreePath
    public object[] FullPath{ get; }
    public object LastNode{ get; }
    public object FirstNode{ get; }

Using TreeView

In the source code, you can find two examples of how to use TreeViewAdv. The simplest way is to use TreeModel. All you need is to populate it with data and display it in the view:

_model = new TreeModel();
_model.Nodes.Add(new Node("Root"));
_tree.Model = _model;

The Node class, which is used in TreeModel, contains only the ‘Text’ and ‘IsChecked’ properties. If you need additional properties, you can create an ancestor of the Node class and use it in TreeModel.

But to use the full power of the TreeViewAdv, you should create your own realization of the ITreeModel interface. See the folder browser presented in the source code, for an example.

Customizing TreeView

There are a number of properties which help to customize the look and behavior of the TreeView. The main ones are:

  • Model - Assign your model to this property to display it.
  • NodeControls - The collection of controls which will be used to visualize the model. You should provide at least one NodeControl in order to see the model.
  • LoadOnDemand - Read all child nodes at start-up or when the parent node expands.
  • SelectionMode - Single (no multi-selection), Multi, MultiSameParent (children of only one node can be selected).
  • UseColumns - Display data in columns or not.
  • Columns - The collection of columns. For each column, you can specify its header, width and alignment.


The standard TreeView can display only one icon, CheckBox, and Label for each node. In TreeViewAdv, you can use any number of NodeControl. All controls must inherit from the ‘NodeControl’ abstract class. Inherited classes should contain the code to draw the control and the code to respond on user actions – mouse and keyboard events.


This is the class diagram of all NodeControls provided by the library:

Class diagram

The BindableControl class provides a ‘DataPropertyName’ which is used in the control to read and write data to the node. All that you need is to specify the name of the property of your class.

Terms and Conditions

The TreeViewAdv control is provided as free software with open source code. You can use it in your applications if the original copyright is kept.

The latest version of TreeViewAdv is always available here. Please feel free to add your comments and suggestions in the forum there.


This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here


About the Author

Andrey Gliznetsov
Software Developer
Russian Federation Russian Federation
No Biography provided

Comments and Discussions

QuestionLooks great.. PinmemberMohan Sawant28-Jan-15 0:34 
QuestionGrouping PinmemberBrendt.w8-Sep-14 1:03 
QuestionTreeview in Asp.Net PinmemberMember 1102619821-Aug-14 20:56 
QuestionIn one PC, the tree node's text is not show. Pinmembermail_main27-May-14 18:37 
QuestioniedEdit node PinmemberMember 950575615-May-14 20:33 
QuestionNodeButton PinmemberHansDampft24-Mar-14 19:25 
Questionreceiving error on conversion PinprofessionalAgent_Spock22-Feb-14 8:34 
QuestionisLeaf is always false, so leaf state icon does not display PinmemberMember 1055910529-Jan-14 14:58 
QuestionAdvanced TreeView on SourceForge Pinmemberpzajic14-Jan-14 1:08 
QuestionRedraw issue after editing a cell?? Pinprofessional i006-Jan-14 19:17 
QuestionLooks simple code samples...made me to look out for another.... PinmemberAnandChavali22-Dec-13 7:02 
AnswerRe: Looks simple code samples...made me to look out for another.... Pinprofessional i007-Jan-14 16:07 
Questionis it possible to configure columns to autosize? Pinmembercarga10-Dec-13 10:07 
QuestionThis looks fantastic but... Pinmembermtthwbrnd8-Oct-13 19:06 
QuestionTree gets deleted when scrolling PinmemberShochat16-Sep-13 22:53 
QuestionUsing VisualStyles for row selection/hilighting [modified] Pinmembercurtis175730-Aug-13 12:05 
Questiondirection tree from right to left (arabic) PinmemberMember 1021374716-Aug-13 6:50 
QuestionWith Custom treeview column I am not able to bind ComboBoxColumn Data PinmemberRBajania17-Jul-13 1:52 
QuestionHow to install the treeview PinmemberMember 950484425-Apr-13 23:21 
AnswerRe: How to install the treeview PinmemberCh4m3l30n17-Jun-13 14:30 
BugGetting Error while working in combo box Pinmembersuresh111019837-Apr-13 22:36 
Question2 different label for one node PinmemberMember 986945021-Mar-13 23:51 
QuestionMove Up & down functionality PinmemberRam Shelke17-Mar-13 0:23 
AnswerRe: Move Up & down functionality PinmemberWilliam Winner18-Mar-13 3:42 
QuestionTreeview binding in database PinmemberMember 967163519-Dec-12 1:39 
QuestionAdd Node after a node PinmemberPapyRef29-Nov-12 12:07 
Suggestion[My vote of 2] Lack of examples... PinmemberNiyazi Yarar23-Nov-12 13:25 
GeneralMy vote of 5 PinmemberSimon_12-Nov-12 7:52 
QuestionExpand Node PinmemberKenneth Psaila5-Oct-12 2:45 
QuestionShow/Hide TreeNode Pinmembermccallug3-Oct-12 7:14 
QuestionScrolling bug Pinmemberare_all_nicks_taken_or_what18-Sep-12 6:07 
NewsRe: Scrolling bug PinmemberNiyazi Yarar24-Sep-12 4:44 
QuestionHangs in FindModel() Pinmemberare_all_nicks_taken_or_what18-Sep-12 5:56 
AnswerRe: Hangs in FindModel() Pinmemberare_all_nicks_taken_or_what18-Sep-12 6:03 
QuestionCPOL license terms PinmemberBarbara Evans15-Aug-12 0:18 
QuestionRefreshing a node with out collapsing the tree PinmemberDavid Koenig12-Jul-12 21:12 
AnswerSet the Startup Project to SampleApp to avoid exception "Assembly doesn't contain any UserControl types." PinmemberDavid Deley6-Jul-12 20:01 
Right-click on the Solution 'TreeViewAdv'
select Properties

(Solution 'TreeViewAdv' Property Pages)
(left side)
Common Properties > Startup Project
Single startup project
set that to "SampleApp" instead of "Aga.Controls"


(See end of)[^]
QuestionVertical Column Headers PinmemberMatthysDT6-Jul-12 1:24 
QuestionExport to CSV or Excel Pinmemberksanghavi21-Jun-12 11:39 
QuestionSynchronize scrolling? Pinmemberdenciaq31-May-12 21:57 
AnswerRe: Synchronize scrolling? PinmemberMember 1016658923-Jul-13 2:06 
GeneralMy vote of 5 Pinmemberkorolevsa14-Apr-12 4:26 
QuestionTrouble Downloading PinmemberJason Gauthier10-Apr-12 12:10 
BugLosing reference to the TreeNodeAdv inside node controls PinmemberMember 85781515-Apr-12 2:20 
GeneralMy vote of 5 Pinmemberwdydxf11-Mar-12 18:08 
QuestionHow to filter the nodes with their parents accordingly? PinmemberMember 42266409-Jan-12 23:14 
SuggestionIcons being drawn incorrectly Pinmemberjoehoper21-Nov-11 10:18 
GeneralMy vote of 5 Pinmemberjoehoper21-Nov-11 9:52 
Generalabout the tree develop thinking Pinmemberlovejun26-Oct-11 17:20 
SuggestionRedo in VCS 2010 Express, please. VCS Errors are in V1.7.0.0 and versionless zip file. PinmemberLou Arnold12-Oct-11 16:57 

General General    News News    Suggestion Suggestion    Question Question    Bug Bug    Answer Answer    Joke Joke    Rant Rant    Admin Admin   

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.

| Advertise | Privacy | Terms of Use | Mobile
Web03 | 2.8.150414.1 | Last Updated 10 Jul 2006
Article Copyright 2006 by Andrey Gliznetsov
Everything else Copyright © CodeProject, 1999-2015
Layout: fixed | fluid