Create table of content using treeview

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I am trying create a TOC(Table Of Content) using a tree view with the parent/child relationship.

For example, my datatable is like

ID Parent_Id Name
1 0 AA
2 1 BB
3 1 CC
4 3 3rd Child Of CC
5 0 DD
6 5 EE
7 5 FF

I want show the tree node as

AA
------BB
------CC
*****------3rd Child Of CC
DD
------EE
------FF

Please help me sir

Posted 23-Apr-13 3:12am

kanamala subin

Updated 24-Apr-13 1:20am

v6

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OriginalGriff 23-Apr-13 9:30am

DON'T SHOUT. Using all capitals is considered shouting on the internet, and rude (using all lower case is considered childish). Use proper capitalisation if you want to be taken seriously.

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_RatneshDubey · Answer 1 · 2013-04-23T22:12:00

You can take these steps to use tree view with the parent/child relationship

1-First bind parent data on load event of form or page

C#

DataTable dt= new DataTable();
              dt= GetMenuData();// here inside get GetMenuData method you can write query like this - select * from yourtablename where parent_id=0
              PopulateParentNodes(dt);

2- Now you can write a PopulateParentNodes method for binding all parent nodes

C#

private void PopulateParentNodes(DataTable dt)
       {
           foreach (DataRow row in dt.Rows)
           {
               TreeNode newNode = new TreeNode(row["Name"].ToString(),
               row["Id"].ToString());

               TreeView1.Nodes.Add(newNode);
               newNode.PopulateOnDemand = true;
           }
       }

3- Next you can generate an event TreeView1_TreeNodePopulate so that you can populate child nodes on demand-

C#

protected void TreeView1_TreeNodePopulate(object sender, TreeNodeEventArgs e)
       {

          DataTable dt= new DataTable();
           int id = Convert.ToInt32(e.Node.Value);
           dt= objplace.PopulateChildNodes(id);

           foreach (DataRow row in dt.Rows)
           {

               TreeNode newNode = new TreeNode(row["Name"].ToString(),
                row["Id"].ToString());

                e.Node.ChildNodes.Add(newNode);
           }
       }

kanamala subin · Answer 2 · 2013-04-24T04:15:00

By using a recursion Method I completed this...

First suppose you have the data inside a datatable
Then use this code

void PopulateMenu()
{
dtTocData = new DataTable();
dtTocData = MacroInfo.dtToc;

if (dtTocData!=null && dtTocData.Rows.Count > 0)
{
DataTable dtParents = GetTOCByParent(0);
foreach (DataRow drTOC in dtParents.Rows)
{
AddSubMenu(drTOC, trvToc.Nodes);
}
}
}
private void AddSubMenu(DataRow drTOC, TreeNodeCollection tncTOC)
{
TreeNode oTOCNode;
DataTable dtTOCs = GetTOCByParent(Convert.ToInt32(drTOC["TocId"]));
oTOCNode = new TreeNode(Convert.ToString(drTOC["Name"]),Convert.ToString(drTOC["Name"]));
//oTOCNode.Selectable = false;
tncTOC.Add(oTOCNode);
foreach (DataRow drChildRow in dtTOCs.Rows)
{
AddSubMenu(drChildRow, oTOCNode.ChildNodes);
}
}

private DataTable GetTOCByParent(int TocId)
{
DataTable dtTOCs = new DataTable();
DataRow[] drTOC = null;
drTOC = dtTocData.Select("ParentId='" + TocId + "'");
if (drTOC.Length > 0)
{
dtTOCs = drTOC.CopyToDataTable();
}
return dtTOCs;
}

Create table of content using treeview

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