Expand and collapse tree view

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hi,

I am using a treeview,in which i want to expand that node only which is selected,and others are collapse.I have used a code for doing this,but i want to know that how to bind the tree on pageload by which the code is run.

my code is given below:

C#

protected void Tree_SelectNodeChange(object sender, EventArgs e)
{
   var tree = (TreeView)sender;
   foreach (TreeNode node in tree.Nodes)
   {
       node.CollapseAll();
   }
   ExpandToRoot(tree.SelectedNode);
}

private void ExpandToRoot(TreeNode node)
{
   node.Expand();
   if (node.Parent != null)
   {
       ExpandToRoot(node.Parent);
   }
}

thanks

Posted 22-Mar-12 0:06am

deepa5

Updated 22-Mar-12 0:12am

ProEnggSoft

v2

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ProEnggSoft 22-Mar-12 6:12am

Edit: Indentation adjusted, code tags added.

Pablo Aliskevicius 22-Mar-12 8:12am

Any reason not to let the user choose what to expand and what to collapse? That's what most people, IMHO, expect.

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Clifford Nelson · Answer 1 · 2012-03-22T13:33:00

Solution 1

I am assuming that this is WinForm. Everything on WinForm is manual, which means that you will have to collapse every node. I would recommend that you keep a pointer to the most recently expanded node, and on the node selected event, to to that node and collapse the node and its parents.

Posted 22-Mar-12 13:33pm

Clifford Nelson