recursive one table to treeview in c#

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i wanna show may recursive table thats name is Location and has 4 colum ns"ID,Title,LatinTitle,ParentID" in tree view.

in web and I drag and drop a treeview1 what shall i do? please help me i'm learner

Posted 4-Aug-12 21:15pm

Mina Mansouri

Updated 5-Aug-12 1:17am

Kenneth Haugland

v3

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OriginalGriff 5-Aug-12 3:18am

This is not a good question - we cannot work out from that little what you are trying to do.
Remember that we can't see your screen, access your HDD, or read your mind.
For example, what do you mean by "recursive table"?
What environment are you writing for? Web? Winforms? WPF?
Give us details, or we can't really help you much!
Use the "Improve question" widget to edit your question and provide better information.

Tarun Mangukiya 5-Aug-12 3:39am

OriginalGriff is right.
Please explain in brief...

Mina Mansouri 5-Aug-12 3:39am

I told WEB!! I have one table in sql 2008r2 its name is Location and has 4 colum ns"ID,Title,LatinTitle,ParentID" i wanna show this in tree view in web .is it clear? Ido not know how can i write its code.thanks alot

Mina Mansouri 5-Aug-12 3:40am

i tried this http://www.dotnetspider.com/resources/28676-Populate-TreeView-From-DataBase-Using-Recursive.aspx
but it did not help me

Mina Mansouri 5-Aug-12 3:52am

I would appreciate you guys :( heeeeelllllllppppp meeeeeeeee :((

2 solutions

Solution 2

Here is the code I used to make a treeview model for upto multilevel hierarchy using a single recursive function.
It can be easily modified to use as required.

private List<TreeViewItemModel> MakeTree(IEnumerable<MyObject> list, TreeViewItemModel parentNode)
        {
            List<TreeViewItemModel> treeViewList = new List<TreeViewItemModel>();
            var nodes = list.Where(x => parentNode == null ? x.ParentID == 0 : x.ParentID == int.Parse(parentNode.Id));
            foreach (var node in nodes)
            {
                TreeViewItemModel newNode = new TreeViewItemModel();
                newNode.Id = node.ID.ToString();
                newNode.Text = node.Text;

                if (parentNode == null)
                {
                    treeViewList.Add(newNode);
                }
                else
                {
                    parentNode.Items.Add(newNode);
                }
                BindTree(list, newNode);
            }
            return treeViewList;
        }

Posted 1-Sep-14 21:30pm

Adil Jarral

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Prabhat *Spark* · Accepted Answer · 2012-08-05T05:47:00

The Example at Populate TreeView From DataBase[^] by Moinul Islam[^] is working just fine,I just checked it.. This is the modified code according to my local table that i used..

C#

public SqlConnection con = new SqlConnection();    
    protected void Page_Load(object sender, EventArgs e)
    {
        Load_tree();
    }
    
    protected DataSet PDataset(string select_statement)
    {
        Connect();
        con.Open();
        SqlDataAdapter ad = new SqlDataAdapter(select_statement, con);
        DataSet ds = new DataSet();
        ad.Fill(ds);
        con.Close();
        return ds;
    }

    public void Connect()
    {
        con = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["cnstring"].ConnectionString);
    }

    public void Load_tree()
    {
        DataSet PrSet = PDataset("SELECT * FROM tbl_WebMenu");
        TreeView1.Nodes.Clear();
        foreach (DataRow dr in PrSet.Tables[0].Rows)
        {
            if ((int)dr["ParentID"] == 0)
            {
                TreeNode tnParent = new TreeNode();
                tnParent.Text = dr["MenuName"].ToString();
                string value = dr["MenuID"].ToString();
                tnParent.Expand();
                TreeView1.Nodes.Add(tnParent);
                FillChild(tnParent, value);
            }
        }
    }

    public int FillChild(TreeNode parent, string IID)
    {
        DataSet ds = PDataset("SELECT * FROM tbl_WebMenu WHERE ParentID =" + IID);
        if (ds.Tables[0].Rows.Count > 0)
        {
            foreach (DataRow dr in ds.Tables[0].Rows)
            {
                TreeNode child = new TreeNode();
                child.Text = dr["MenuName"].ToString().Trim();
                string temp = dr["MenuID"].ToString();
                child.Collapse();
                parent.ChildNodes.Add(child);
                FillChild(child, temp);
            }
            return 0;
        }
        else
        {
            return 0;
        }
    }

If you want something else state it clearly..e.g "Recursive table"?!.. if you mean following structure

HTML

Parent 1
    -- Sub-Parent
         --Child
Parent 2
    -- Child
Parent 3
Parent 4
    -- Child 1
    -- Child 2

the above code by Moinul Islam is for you.. If not then explain "Recursive table"