TreeViewNode.Parent Property

Gets the immediate parent node to which the current node belongs.

Namespace: DevExpress.Web

Assembly: DevExpress.Web.v19.1.dll

Declaration

C#

public TreeViewNode Parent { get; }

VB.NET

Public ReadOnly Property Parent As TreeViewNode

Property Value

Type	Description
TreeViewNode	A TreeViewNode object representing the node’s immediate parent.

Remarks

Use the Parent property to identify and access the immediate parent node which owns the current node.

Example

The sample code below represents an ASPxTreeView.ExpandedChanging event handler. The event handler prevents collapsing nodes if it has selected children in any generation.

Note

A complete sample project is available at https://github.com/DevExpress-Examples/how-to-prevent-parent-node-collapsing-e2439

Default.aspx.cs

using DevExpress.Web.ASPxTreeView;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void ASPxTreeView1_ExpandedChanging(object source, DevExpress.Web.ASPxTreeView.TreeViewNodeCancelEventArgs e) {
        if ((e.Node.Expanded) && (ASPxTreeView1.SelectedNode != null)) {
            TreeViewNode  node = ASPxTreeView1.SelectedNode.Parent;
            while (node != null) {
                if (e.Node == node) {
                    e.Cancel = true;
                    break;
                }
                node = node.Parent;
            }
        }
    }
}

Default.aspx (C#)

<dx:ASPxTreeView ID="ASPxTreeView1" runat="server" DataSourceID="XmlDataSource1" AutoPostBack="True" AllowSelectNode="True" OnExpandedChanging="ASPxTreeView1_ExpandedChanging">
</dx:ASPxTreeView>
<asp:XmlDataSource ID="XmlDataSource1" runat="server" DataFile="~/App_Data/MenuTabbedMenu.xml"
    XPath="/mainmenu/item"></asp:XmlDataSource>

Default.aspx (VB.NET)

<dx:ASPxTreeView ID="ASPxTreeView1" runat="server" DataSourceID="XmlDataSource1" AutoPostBack="True" AllowSelectNode="True" OnExpandedChanging="ASPxTreeView1_ExpandedChanging">
 </dx:ASPxTreeView>
 <asp:XmlDataSource ID="XmlDataSource1" runat="server" DataFile="~/App_Data/MenuTabbedMenu.xml"
     XPath="/mainmenu/item"></asp:XmlDataSource>

Default.aspx.vb

Imports DevExpress.Web.ASPxTreeView

Partial Public Class _Default
    Inherits System.Web.UI.Page
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)

    End Sub
    Protected Sub ASPxTreeView1_ExpandedChanging(ByVal source As Object, ByVal e As DevExpress.Web.ASPxTreeView.TreeViewNodeCancelEventArgs)
        e.Node.Expanded = True
        If e.Node.Expanded AndAlso (ASPxTreeView1.SelectedNode IsNot Nothing) Then
            Dim node As TreeViewNode = ASPxTreeView1.SelectedNode.Parent
            Do While node IsNot Nothing
                If e.Node Is node Then
                    e.Cancel = True
                    Exit Do
                End If
                node = node.Parent
            Loop
        End If
    End Sub
End Class

Related GitHub Examples

The following code snippet (auto-collected from DevExpress Examples) contains a reference to the Parent property.

Note

The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.

C#

how-to-implement-sidebar-navigation-shown-in-devexpress-demos-t598380/CS/AdaptiveSlideNavigation/UserControls/Navigation.ascx.cs#L22

while(node != null) {
    if(node.Parent != null && node.Parent.Parent == null)
        node.Expanded = false;

VB.NET

how-to-implement-sidebar-navigation-shown-in-devexpress-demos-t598380/VB/AdaptiveSlideNavigation/UserControls/Navigation.ascx.vb#L26

Do While node IsNot Nothing
    If node.Parent IsNot Nothing AndAlso node.Parent.Parent Is Nothing Then
        node.Expanded = False