How to set icons for the windows forms treeview control ?

Dong Lam Trien

I use imageList to store icons and I assign imageList to treeView, I use treeView1_DrawNode to change icon for treeView but this function does not run. See my photo and code below.

namespace TreeView
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
treeView1.ImageList = imageList1;
this.treeView1.DrawNode += new System.Windows.Forms.DrawTreeNodeEventHandler(this.treeView1_DrawNode);
dt = CreateTable(10);
CreateTreeView(dt, treeView1, true);
}
DataTable dt = new DataTable();
... //My code
private void treeView1_DrawNode(object sender, DrawTreeNodeEventArgs e)
{
if (e.Node.IsExpanded || e.Node.Nodes.Count < 1)
treeView1.ImageIndex = 0;
else
treeView1.ImageIndex = 1;
}
}

http://www.mediafire.com/file/iz4mvxfu9o0h863/treeView01.jpg

Why is the treeView1_DrawNode(...) function not running? How to change my treeView icons instead of +,- like a windows explorer treeview in win forms?

4 Replies

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Dong Lam Trien6y ago
The documents you sent me have read but I have not found the documents I need, I want to change the image of the first and last nodes (the first one is called "All" and the last one is "Trash can") but I have not Changeable, I want to design treeView as an attached image
http://www.mediafire.com/file/47pnxx5ocau91ih/treeView06a.jpg
0
Jignesh Kumar6y ago
Hi,

Please use this link which will help you,

http://msdn.microsoft.com/en-us/library/system.windows.forms.treeview.imageindex.aspx
0
Vinay Singh6y ago
Please check the link
https://docs.microsoft.com/en-us/dotnet/framework/winforms/controls/how-to-set-icons-for-the-windows-forms-treeview-control
https://stackoverflow.com/questions/13782649/setting-images-from-icons-in-a-treeview
0
Rajanikant Hawaldar6y ago
Check these links
http://vbcity.com/blogs/xtab/archive/2013/08/27/windows-forms-adding-system-icons-to-treeview-nodes.aspx
https://www.codeproject.com/Articles/7884/Data-Binding-TreeView-in-C
https://docs.microsoft.com/en-us/dotnet/api/system.windows.forms.treeview.imagelist?redirectedfrom=MSDN&view=netframework-4.8#System_Windows_Forms_TreeView_ImageList
https://docs.microsoft.com/en-us/dotnet/api/system.windows.forms.treeview.imageindex?redirectedfrom=MSDN&view=netframework-4.8#System_Windows_Forms_TreeView_ImageIndex
https://stackoverflow.com/questions/13782649/setting-images-from-icons-in-a-treeview
0