Hi,

I'm having an issue with the ASP.NET 2.0 Treeview control and persisting
its' state accross requests. My Control is embedded within a master page
  and is used for site navigation. My problem is that the user wants to
know which page they are currently on and therefore I need to highlight
the selected node. The problem is I lose state whenever the user selects
  a node and is redirected to another page.

Thanks in advance
Nikron

Nikron wrote:
So I've figured out the problem.

First of all if you use the NavigateURL property when binding the data
to the Treeview it will not raise the OnSelectedNodeChanged event.
That's part 1 of the problem. Since I am using a master page with the
treeview on it each time a user selects a different node it redirects
them to a different page and therefore loads the master page again and
looses the viewstate of the treeview.

So to combat this I took out the NavigateURL property for each node and
instead performed a Response.Redirect within the OnSelectedNodeChanged.
The main issue in this is that the client wanted to see the selected
node highlighted and of course with the issue I am having where the
treeview looses its state it cannot highlight the selected node because
it is being reloaded the whole time.

So what I done inside the OnSelectedNodeChanged Event (It gets raised
now because the NavigateURL property is not present) is created a
session variable "SelectedNodeValuePath" and set it equal to the
Treeview.SelectedNode.ValuePath property. Then OnPagePreRender within
the master page I set the selected node to
TreeView.FindNode(Session["SelectedNodeValuePath"].ToString()).Select().

This solves my problem, except that the value for each node is infact a
url which contains "/" characters. This was causing all sorts of
problems for the FindNode method. Seems that the "/" character is the
default delimiter for the Treeview valuepath fields. So what I had to do
as well was set the PathSeparator=":" on the Treeview and all worked.

Hope this helps someone and they don't have to waste any of their time.


Nikron

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