How to add icon to TreeView using C#

This topic shows how to add icon to TreeView nodes using C# programming.
Tools needed: Button1 (Button1), TreeView1 (TreeView1).

TreeView Control – How to add icon to TreeView using C#

The Windows Forms TreeView control displays a hierarchy of nodes, like the way files and folders are displayed in the left pane of the Windows Explorer feature in Windows operating systems.
The top level of the TreeView is called Root node that can be expanded or collapsed if they have a child node

ImageList Class – How to add icon to TreeView using C#

ImageList class provides methods to manage a collection of Image objects. This class cannot be inherited.
Syntax

// Declaration
public sealed class ImageList : Component {
}

// Declaration

public sealed class ImageList : Component {

}

ImageList.Images Property – How to add icon to TreeView using C#

Helps to get the ImageList.ImageCollection for this image list.
Syntax

// Declaration
    public ImageList.ImageCollection Images {
    }

// Declaration

public ImageList.ImageCollection Images {

}

TreeView.ImageList Property – How to add icon to TreeView using C#

Helps to assign the ImageList that contains the Image objects that are used by the tree nodes.

Syntax

// Declaration
    public ImageList ImageList {
    }

// Declaration

public ImageList ImageList {

}

TreeView.SelectedImageIndex Property – How to add icon to TreeView using C#

It helps to assign the image list index value of the image that is displayed when a tree node is selected.
Syntax

// Declaration
    [RelatedImageListAttribute("ImageList")]
    public int SelectedImageIndex {
    }

// Declaration

[RelatedImageListAttribute("ImageList")]

public int SelectedImageIndex {

}

How to add icon to TreeView using C# – Complete Code

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void FillTreeView()
        {
            //  Load the images in an ImageList. 
            ImageList ImageList = new ImageList();
            ImageList.Images.Add(Image.FromFile("C:\\Winter.jpg"));
            ImageList.Images.Add(Image.FromFile("C:\\testimage.jpg"));
            ImageList.Images.Add(Image.FromFile("C:\\sunset.jpg"));
            //  Assign the ImageList to the TreeView.
            TreeView1.ImageList = ImageList;
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            FillTreeView();
            //  Set the TreeView control's default image and selected image indexes.
            TreeView1.ImageIndex = 0;
            TreeView1.SelectedImageIndex = 1;
            TreeView1.Nodes.Add("Class Room");
            TreeView1.Nodes[0].Nodes.Add("STD I");
            TreeView1.Nodes[0].Nodes[0].Nodes.Add("DIV A");
            TreeView1.Nodes[0].Nodes.Add("STD II");
            TreeView1.Nodes[0].Nodes[1].Nodes.Add("DIV B");
            TreeView1.Nodes[0].Nodes.Add("STD III");
            TreeView1.Nodes[0].Nodes[2].Nodes.Add("DIV C");
        }

    }
}

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

namespace WindowsFormsApplication1

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

private void FillTreeView()

{

// Load the images in an ImageList.

ImageList ImageList = new ImageList();

ImageList.Images.Add(Image.FromFile("C:\\Winter.jpg"));

ImageList.Images.Add(Image.FromFile("C:\\testimage.jpg"));

ImageList.Images.Add(Image.FromFile("C:\\sunset.jpg"));

// Assign the ImageList to the TreeView.

TreeView1.ImageList = ImageList;

}

private void Form1_Load(object sender, EventArgs e)

{

FillTreeView();

// Set the TreeView control's default image and selected image indexes.

TreeView1.ImageIndex = 0;

TreeView1.SelectedImageIndex = 1;

TreeView1.Nodes.Add("Class Room");

TreeView1.Nodes[0].Nodes.Add("STD I");

TreeView1.Nodes[0].Nodes[0].Nodes.Add("DIV A");

TreeView1.Nodes[0].Nodes.Add("STD II");

TreeView1.Nodes[0].Nodes[1].Nodes.Add("DIV B");

TreeView1.Nodes[0].Nodes.Add("STD III");

TreeView1.Nodes[0].Nodes[2].Nodes.Add("DIV C");

}

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How to add icon to TreeView using C#

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How to add icon to TreeView using C#

TreeView Control – How to add icon to TreeView using C#

ImageList Class – How to add icon to TreeView using C#

ImageList.Images Property – How to add icon to TreeView using C#

TreeView.ImageList Property – How to add icon to TreeView using C#

TreeView.SelectedImageIndex Property – How to add icon to TreeView using C#

How to add icon to TreeView using C# – Complete Code

How to add icon to TreeView using C#

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