I want to a dynamic recursive method to expand treeview

[Sagar]

Hi, 
    I am having a tree view in which there is no limit for adding the child's level (may be between 20-25) .But i could not find a recursive method which can recursively expand a particular child node (which is the result of the search i am providing).Please help.

Thanks & Regards,
Sagar

[Richard Slade]

Hello Sagar,

This will expand all nodes for you. Or colapse them

For Each node As Telerik.WinControls.UI.RadTreeNode In Me.RadTreeView1.Nodes
    node.ExpandAll()
    'node.CollapseAll()
Next

hope that helps
Richard

[Sagar]

Hi, Richard,
                 Thanks, but i want to expand a particular node and the parents of the particular Node (node may be End Node or middle One)..

Thanks & Regards,
Sagar

[Sagar]

In Rad Asp.net controls we get the one line to expand all the parent nodes.

i.e:
node.expandparentnode=true;

But what is there equivalent to it in WinForms..

[Richard Slade]

Hello Sagar,

As far as I know there is no equivilent is WinForms. You would have to loop over the nodes calling the Expand methid on each one.

If yu want to do this recursively with some conditions attached, have a look at this code library article on searching a tree view which shows how to drill down through a tree view. This can easily be updated to expand or collspase particular nodes under a given condition.

Hope that helps but let me know if you have any other questions
Richard

[Sagar]

Hi, Richard .
         i got time today to come back on this topic. And it clicked to me after some time. Anyways your post gave me some "IDEA". 


Thanks & Regards,
Sagar

[Richard Slade]

Glad that helped.
Richard

[Julian Benkov]

Hello Sagar,

You can use the following code snippet to achieve this behavior:

private void ExpandParents(RadTreeNode childNode)
{
    Stack<RadTreeNode> nodeStack = new Stack<RadTreeNode>();
    nodeStack.Push(childNode.Parent);

    while (nodeStack.Count > 0)
    {
        RadTreeNode current = nodeStack.Pop();
        if (current == null)
        {
            break;
        }

        current.Expand();
        nodeStack.Push(current.Parent);
    }
}

I hope this helps.

Regards,

Julian Benkov
the Telerik team