How to check if TreeView has a One Path 'LINQ'

Question

hi

If you have an answer with a 'linq', I would be very grateful

Answer 1

Hi @Mansour_Dalir ,

You can refer to the following code.

    Private Function CheckSingleChildRootNodes(ByVal treeView As TreeView) As Boolean

        Return treeView.Nodes.Cast(Of TreeNode)().Any(Function(node) CheckSingleNodeAndChildren(node))
    End Function

    Private Function CheckSingleNodeAndChildren(ByVal node As TreeNode) As Boolean

        If node.Nodes.Count <> 1 Then
            Return False
        End If

        Dim childNode As TreeNode = node.Nodes(0)
        Return childNode.Nodes.Count = 0 OrElse CheckSingleNodeAndChildren(childNode)
    End Function

Best Regards.

Jiachen Li

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