Creating treeview from  a dataset VB.net

arozzy
arozzy used Ask the Experts™
on
Hi experts


I have two tables

stokmaster     billofmaterials   ==> TABLES

STOKID pk      STOKID FK  ==> COLUMNS
STOKAD          STOKAD
BILLST             ALTSTKID
                        ALTSTKAD

the relationship is that if a stok in stokmaster table has a bill (BOM), its Billst = 1, and there is a list for its bill of materials in billofmaterials table.

When I am  creating a treeview, only I created for parend and its own child, but i want to show child's child and also its grandchild. I mean that all children of any parent have to be shown in treview.

like that

A
   B
   C
   D
      E
         F
  G
      J
        K
           L
           M
               N
           O
  P
  X
  Y
  Z

I need the method for creating multi level parent child trevieew in vb.net.

Thanks

Best Regards

Oguzhan
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Éric MoreauSenior .Net Consultant
Top Expert 2016

Commented:

Author

Commented:
thanks fpr reply, but this sample only include a parent and its children, there is no any grandchild and child of grandchild in that sample
Éric MoreauSenior .Net Consultant
Top Expert 2016

Commented:
it is the same thing, you will just need more datatables, relations, for loops
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Author

Commented:
then how can I create treeview  by querying childnode? has the childnode a child or not? and adding this child down of that childnode and of course. Also this process will continue to end reaching last child of that item ?
Éric MoreauSenior .Net Consultant
Top Expert 2016

Commented:
a child node is a node. you can add new child nodes to it.

to find out if a node has children or not, you can check YourNode.Nodes.Count > 0
Refer this links

http://stackoverflow.com/questions/7543873/vb-net-populate-treeview-with-dataset-using-parent-child-relations

Have a look at this: Populating a TreeView Control from the Database[^] it's in C#, but it covers doing exactly what you want. Translating it to VB isn't difficult - there are online translators which do most of it for you: http://www.developerfusion.com/tools/convert/csharp-to-vb/[^]

Author

Commented:
THANKS ALL EXPERTS FOR ANSWERS

MY CODE IS BELOW

i CREATE A TWO LEVEL (A PARENT AND A CHILD) TREEVIEW WITH THIS, HOW CAN REACH ALL CHILDREN? PLEASE HELP

adptr2.Fill(dset1, "RCTANA")
        adptr3.Fill(dset1, "STOKANA")
        'Creates a relation between the 2 DataTables
        Dim relPC As DataRelation = dset1.Relations.Add("relSTOKRECETE", _
                                      dset1.Tables("STOKANA").Columns("STOKID"), _
                                      dset1.Tables("RCTANA").Columns("STOKID"))

        With TreeView1
            'prevents the control from painting until the EndUpdate method is called
            .BeginUpdate()
            'Clears/Deletes all nodes that currently exist
            .Nodes.Clear()
            'Loop through all rows of the Categories table
            For Each drSTK As DataRow In dset1.Tables("STOKANA").Rows
                'Adds the Category as a root node
                Dim nodParent As TreeNode
                nodParent = TreeView1.Nodes.Add(drSTK.Item("STOKAD").ToString)
                'Loops through the products related to the Category
                For Each drRCT As DataRow In drSTK.GetChildRows(relPC)
                    'Adds the Product as a child of the Category
                    Dim nodChild As TreeNode
                    nodChild = nodParent.Nodes.Add(drRCT.Item("ALTSTKAD").ToString)
                Next drRCT
            Next drSTK
            'Expands all nodes
            .ExpandAll()
            'Enables the redrawing of the tree view
            .EndUpdate()
            'Ensures that the first node is visible
            .Nodes(0).EnsureVisible()
        End With
Éric MoreauSenior .Net Consultant
Top Expert 2016

Commented:
create 2 other relations
Commented:
problem is solved with recursion and codes are below

        TreeView1.Update()
        TreeView1.Nodes.Clear()
        Dim parent As TreeNode
        parent = New TreeNode(ComboBox1.Text)
        TreeView1.Nodes.Add(parent)
        AddMoreChildren(parent)

        TreeView1.ExpandAll()
        TreeView1.EndUpdate()
        baglan.Close()
    End Sub
    Public Sub AddMoreChildren(ByVal parent As TreeNode)

        Dim ds As New DataSet
        Dim adptr As New SqlDataAdapter("select * from RCTANA where RCTAD = '" + parent.Text + "'", baglan)
        ds.Clear()
        adptr.Fill(ds)
        For i = 0 To ds.Tables(0).Rows.Count - 1
            If ds.Tables(0).Rows(i).Item("RCTAD").ToString = parent.Text Then
                Dim child As TreeNode = New TreeNode(ds.Tables(0).Rows(i).Item("ALTSTKAD").ToString)
                parent.Nodes.Add(child)
                AddMoreChildren(child)
            End If
        Next
    End Sub

Author

Commented:
Dear Experts

Thanks for your helps and I am sorry for this late answer. I had tried for solution since I wrote here last time. I tried adding relationships but it's very hard to create n-level treeview with this method and I tried using a few datasets and this method didnot allow me to have n-level.

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