Select a TreeNode in TreeView in asp.net C#

Question

I have a TreeView Control in my aspx page.

Each TreeNode has a Text & Value property in that.

for e.g.

TreeView Tr_View = new TreeView();
                    TreeNode TrNode=new TreeNode("ABC","1");
                    Tr_View.Nodes.Add(TrNode);
                    TrNode = new TreeNode("DEF", "5");
                    Tr_View.Nodes.Add(TrNode);
                    TrNode = new TreeNode("GHI", "9");
                    Tr_View.Nodes.Add(TrNode);
                    TrNode = new TreeNode("JKL", "11");
                    Tr_View.Nodes.Add(TrNode);

The Problem is that I want to select 3rd node on the basis of its value "9"

Alexander · Accepted Answer · 2015-04-02 15:55:33Z

2

Use following code to find node with value "9" and select it:

var node = Tr_View.FindNode("9");
node.Select();

Note that "9" here is a path to node. So if you will have nodes at non-root level, you will need to specify full path, like "root.child.9".

If you don't have a full path, probably the best way to find a node based on node value would be to traverse all tree nodes:

using System.Linq;
using System.Collections.Generic;
...
IEnumerable<TreeNode> GetAllNodes()
{
  Stack<TreeNode> roots = new Stack<TreeNode>(Tr_View.Nodes);
  while(roots.Count > 0)
  {
    var node = roots.Pop();
    foreach (var child in node.ChildNodes)
      roots.Push(child);

    yield return node;
  }
}
...
var allNodesWithValue9 = GetAllNodes().Where(n => n.Value == "9");

edited Apr 2, 2015 at 15:55

answered Mar 23, 2013 at 21:10

Alexander

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1 Comment

PTansey Over a year ago

.SelectedNode is a READ ONLY property. Your first solution doesn't work

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