About the recursion for Arraylist

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  Hello,

  Here is a pattern to follow using a TreeNode where the pattern should work but untested. Taken from here.

  Function GetChildren(parentNode as TreeNode) as List(Of String)
    Dim nodes as List(Of String) = New List(Of String)
    GetAllChildren(parentNode, nodes)
    return nodes
  End Function
  
  Sub GetAllChildren(parentNode as TreeNode, nodes as List(Of String))
    For Each childNode as TreeNode in parentNode.Nodes
      nodes.Add(childNode.Text)
      GetAllChildren(childNode, nodes)
    Next
  End Sub

  
  

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  Wednesday, February 5, 2020 12:54 PM

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  Thank you, but i want to use one function to return the all node text list.

  Wednesday, February 5, 2020 2:07 PM

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  Like this as a base pattern.

  Public Sub NodesRecursive(ParentNode As TreeNode)
      Console.WriteLine(ParentNode.Text)
      For Each SubNode As TreeNode In ParentNode.Nodes
          NodesRecursive(SubNode)
      Next
  End Sub

  
  

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  NuGet BaseConnectionLibrary for database connections.

  StackOverFlow
  

  Wednesday, February 5, 2020 2:38 PM

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  Your question isn't clear.  Here is an example that uses a Treeview with some nodes.  The code to get all of the nodes is as follows.

      Private Function GetAll(StartNode As TreeNode) As List(Of TreeNode)
          Dim rv As New List(Of TreeNode)
          rv.Add(StartNode) 'up to you
          rv.AddRange(GetChildren(StartNode.Nodes))
          Return rv
      End Function
  
      Private Function GetChildren(ndC As TreeNodeCollection) As List(Of TreeNode)
          Dim rv As New List(Of TreeNode)
          For Each nd As TreeNode In ndC
              rv.Add(nd)
              rv.AddRange(GetChildren(nd.Nodes))
          Next
          Return rv
      End Function
  

  To test the code I did this

          Dim l As List(Of TreeNode) = GetAll(TreeView1.Nodes(0))
  
          Debug.WriteLine("")
          For Each nd As TreeNode In l
              Dim s As New String(ControlChars.Tab, nd.Level)
              Debug.Write(s)
              Debug.WriteLine(nd.Name)
          Next
  

  
  Hope you gain some insights.

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  Wednesday, February 5, 2020 2:53 PM

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  Sorry, i used the Devcomponents AdvTree control. I only want to use a recursion function to get all nodes text to a list and return this list like

   Public Function GetAllNodeText(ByVal nc As NodeCollection) As ArrayList
          Dim alText As New ArrayList
          For Each node As Node In nc
              alText.Add(node.Text)
              If node.HasChildNodes Then
                  alText = alText.AddRange(GetNodeText(node.Nodes))'  I do not know how to write this line???
              End If
          Next
          Return alText
      End Function

  Then invoke it use

  Dim allNodeText as list = GetAllNodeText(Advtree1.Nodes)

  Wednesday, February 5, 2020 10:00 PM

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  Sorry, i used the Devcomponents AdvTree control. I only want to use a recursion function to get all nodes text to a list and return this list like

   Public Function GetAllNodeText(ByVal nc As NodeCollection) As ArrayList
          Dim alText As New ArrayList
          For Each node As Node In nc
              alText.Add(node.Text)
              If node.HasChildNodes Then
                  alText = alText.AddRange(GetNodeText(node.Nodes))'  I do not know how to write this line???
              End If
          Next
          Return alText
      End Function

  Then invoke it use

  Dim allNodeText as list = GetAllNodeText(Advtree1.Nodes)

  I would suggest asking this question at the vendor support

  https://www.devcomponents.com/support.aspx

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  Please remember to mark the replies as answers if they help and unmarked them if they provide no help, this will help others who are looking for solutions to the same or similar problem. Contact via my Twitter (Karen Payne) or Facebook (Karen Payne) via my MSDN profile but will not answer coding question on either.

  NuGet BaseConnectionLibrary for database connections.

  StackOverFlow
  

  Wednesday, February 5, 2020 10:09 PM

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