how to save TreeView State

Question

Hello all

is it possible to save the state of a treeview??

I may or delete items in treeview 

later i want to restore the same with the state i saved before..

thanks in advance.

Answer 1

Hi sadikvt,

check below sample to save TreeViewState

http://blog.binaryocean.com/PermaLink,guid,23808645-43b5-4e2a-afb1-53dc8da35636.aspx 

Regads

Fazal

Answer 2

Hello all

is it possible to save the state of a treeview??

Yes! In fact there is a nice handy code example that will show you exactly how this is done. Download it off the MSDN and walk through the code. It should have everything you need:

Maintain ASP.NET TreeView State:
http://code.msdn.microsoft.com/CSASPNETMaintainTreeViewSta-c7673683

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Thank you,

Answer 3

Hi Sadikvt,

Welcome to the MSDN Forum.

Does your application is asp.net one? If so, atconway's suggest should be helpful.

If your application is a winform one, you can try to save your nodes into a XML file. And populate the treeview with your stored xml file node by the following code snippet:

    Private Sub AddTreeViewChildNodes(ByVal parent_nodes As TreeNodeCollection, ByVal xml_node As XmlNode)
        For Each child_node As XmlNode In xml_node.ChildNodes
            Dim new_node As TreeNode = parent_nodes.Add(child_node.Name)
            'set your tag here
            If child_node.Attributes("Tag") IsNot Nothing Then
                new_node.Tag = child_node.Attributes("Tag").Value
            Else
                new_node.Tag = ""
            End If

            AddTreeViewChildNodes(new_node.Nodes, child_node)
            If new_node.Nodes.Count = 0 Then new_node.EnsureVisible()
        Next child_node
    End Sub


    Private Sub SaveTreeViewChildNodes(ByVal parent_nodes As TreeNodeCollection, ByVal xml_node As XmlElement)

        For Each child_node As TreeNode In parent_nodes
            Dim new_node As XmlElement
            Dim doc As New XmlDocument
            new_node = doc.CreateElement(XmlNodeType.Element, child_node.Name, "")
            'set your tag here
            new_node.SetAttribute("Tag", child_node.Tag)
            xml_node.AppendChild(new_node)

            SaveTreeViewChildNodes(child_node.Nodes, new_node)
        Next child_node
    End Sub

I hope this will be helpful.

Best regards,

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Mike Feng
MSDN Community Support | Feedback to us
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