Get Treeview Node Value on click

Chris Johnson

15y18.5k

Hello all,

I am trying to get the clicked nodes value and enter that value into a label.
I am sure I am on the right lines using the After_Select event, somthing like this.

private void treeView2_AfterSelect(object sender, EventArgs e)
{
Label2.Text = TreeView2.SelectedNode.Value;
}

Unfortunately this returns nothing. So basically say the rootnode of a treeview (Bound to sql server but this makes no difference) was "RT00000215", when the node is clicked to expand it I need the root node string to appear in a label.

Could anyone please help me?

5 Replies

Know the answer? Post it — somebody with the same question will find it here.

Vulpes15y ago
Accepted answer
Well, the Windows Forms TreeViewEventArgs object has two properties, Action and Node.

'Action' tells you whether the event was caused by a TreeNode being selected, expanded or collapsed.

'Node' gets the TreeNode that this happened to.

In the ASP.NET TreeView, you have SelectedNodeChanged, TreeNodeExpanded and TreeNodeCollapsed events - so there's no problem getting the action.

You can get the selected node with the SelectedNode property and the other two events generate TreeNodeEventArgs objects which have a Node property to tell you which node it happened to.
Chris Johnson15y ago
Exactly what I needed. Cheers man ;-)

Should share points with Satyapriya really but I don't think you can do that :-(

Thanks everyone!

*Edit - Final Solution.

void TreeView1_TreeNodeExpanded1(object sender, TreeNodeEventArgs e)
{
TextBox1.Text = e.Node.Text;
}

Simple when you know how ;-)
Chris Johnson15y ago
Hi both, thank you very much for your answers.

I should of mentioned, however, it is a webform I am building.
My only problem now is that TreeViewEventArgs is from System.Windows.Forms namespace. After a little surfing I discovered that with a webform I should be using the System.Web.UI.WebControls namespace. Unfortunately this does not contain TreeViewEventArgs, any idea what I should use instead of TreeViewEventArgs?
Satyapriya Nayak15y ago
Hi Chris,

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 treeView1_AfterSelect(object sender, TreeViewEventArgs e)
        {
            label1.Text = treeView1.SelectedNode.Text;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            treeView1.Nodes.Add("Student");
            treeView1.Nodes[0].Nodes.Add("Raj");
            treeView1.Nodes[0].Nodes.Add("Ravi");
            treeView1.Nodes[0].Nodes.Add("Rahul");
        }
    }
}

Thanks
Vulpes15y ago
Try:

Label2.Text = TreeView2.SelectedNode.Text;