TreeViewNode.Parent Property

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

Namespace: DevExpress.Web

Assembly: DevExpress.Web.v23.2.dll

NuGet Package: DevExpress.Web

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 ExpandedChanging event handler. The event handler prevents collapsing nodes if it has selected children in any generation.

Default.aspx

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

Default.aspx.cs

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.vb

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

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#

asp-net-web-forms-implement-sidebar-navigation/CS/AdaptiveSlideNavigation/UserControls/Navigation.ascx.cs#L22

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

VB.NET

asp-net-web-forms-implement-sidebar-navigation/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