Hi
I am trying to populate TreeView from database but I am having problems with sub child nodes
Why "Durres" doesnt show up as child of "Tirana" and why "Shkoder" doesnt show up as child of "Durres"?
Database code
CREATE TABLE [dbo].[TopBill] (
[srNo] INT NOT NULL IDENTITY,
[Pid] INT NULL,
[PName] VARCHAR (50) NULL,
[PDetails] NCHAR (10) DEFAULT (NULL) NULL,
[cId] INT NULL,
[Cname] VARCHAR (50) NULL,
[Cqty] INT DEFAULT (NULL) NULL,
CONSTRAINT [PK_TopBill] PRIMARY KEY CLUSTERED ([srNo] ASC)
);Database data
C# code
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace WebApplication1
{
public partial class Index : System.Web.UI.Page
{
Boolean m_bNodeFound;
Boolean intNodeFound;
string sValuepath;
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
using (var connection = new SqlConnection("Data Source=(localdb)\\ProjectsV13;Initial Catalog=gab;Integrated Security=True;Connect Timeout=30;Encrypt=False;TrustServerCertificate=False;ApplicationIntent=ReadWrite;MultiSubnetFailover=False"))
{
string com = "Select * from dbo.TopBill";
SqlDataAdapter adpt = new SqlDataAdapter(com, connection);
DataTable dt = new DataTable();
adpt.Fill(dt);
connection.Open();
TreeNode root = new TreeNode();
root = new TreeNode();
root.Text = dt.Rows[0][5].ToString();
root.Value = dt.Rows[0][5].ToString();
TreeView1.Nodes.Add(root);
for (int i = 0; i < dt.Rows.Count; i++)
{
//make NodeNotFound at each row
m_bNodeFound = false;
//root as it is
TreeNode tn = root;
//get NodeName by cName
string nodeName = dt.Rows[i][5].ToString();
//Check if it is not null, to skip errors
if (nodeName != null && nodeName != "")
{
//MainNodecollections
TreeNodeCollection nodes = TreeView1.Nodes;
//Check if node already exists in Treeview
FindNodeInHierarchy(nodeName);
//If not found then continue
if (!m_bNodeFound)
{
//If node is root node
if (dt.Rows[i][2].ToString() == "" || dt.Rows[i][2].ToString() == null)
{
TreeNode root2 = new TreeNode();
root2.Text = dt.Rows[i][5].ToString();
root2.Value = dt.Rows[i][5].ToString();
TreeView1.Nodes.Add(root2);
}
//Check if node is child node
else if (CheckRowsAllValues(dt.Rows[i][1].ToString(), dt))
{
//Find New Root of child node
TreeNode NewRoot = FindRoot(dt.Rows[i][1].ToString(), dt, root);
//if New root is not empty
if (NewRoot != null)
{
TreeNode root2 = new TreeNode();
root2.Text = dt.Rows[i][5].ToString();
root2.Value = dt.Rows[i][5].ToString();
//append child node(current value) with new root
NewRoot.ChildNodes.Add(root2);
}
}
}
}
}
}
}
}
private TreeNode FindRoot(string v, DataTable dt, TreeNode tNode)
{
string expression = "cId = " + v;
DataRow[] foundRows;
foundRows = dt.Select(expression);
//Find node using Id of table row
TreeNode tn = TreeView1.FindNode(foundRows[0][0].ToString());
//if not found, search using Name
if (tn == null && foundRows[0][5].ToString() != "")
{
var value = foundRows[0][5].ToString();
TreeNode searchedNode = null;
//search node by Value(City Name) by looping each node
foreach (TreeNode node in TreeView1.Nodes)
{
if (searchedNode == null)
{
searchedNode = SearchNode(node, value);
if (searchedNode == null)
{
foreach (TreeNode childNode in node.ChildNodes)
{
searchedNode = SearchNode(childNode, value);
if (searchedNode != null)
tn = searchedNode;
}
}
else
{
break;
}
}
else
{
break;
}
}
tn = searchedNode;
}
return tn;
}
//Search Node code
private TreeNode SearchNode(TreeNode node, string searchText = null)
{
if (node.Text == searchText) return node;
TreeNode tn = null;
foreach (TreeNode childNode in node.ChildNodes)
{
tn = SearchNode(childNode);
if (tn != null) break;
}
if (tn != null) node.Expand();
return tn;
}
private bool CheckRowsAllValues(string v, DataTable dt)
{
string expression = "cId = " + v;
DataRow[] foundRows;
foundRows = dt.Select(expression);
if (foundRows.Count() > 0)
{
return true;
}
else
{
return false;
}
}
private void FindNodeByValue(string strValue)
{
// If the TreeView control contains any root nodes, perform a
// preorder traversal of the tree and display the text of each node.
if (TreeView1.Nodes.Count > 0)
{
// Iterate through the root nodes in the Nodes property.
for (int i = 0; i < TreeView1.Nodes.Count; i++)
{
// Display the nodes.
DisplayChildNodeText(TreeView1.Nodes[i], strValue);
}
}
}
void DisplayChildNodeText(TreeNode node, string strValue)
{
// Display the node's text value.
//Message.Text += node.Text + "<br />";
if (strValue == node.Text.ToString())
{
sValuepath = node.ValuePath;
intNodeFound = true;
}
// Iterate through the child nodes of the parent node passed into
// this method and display their values.
for (int i = 0; i < node.ChildNodes.Count; i++)
{
DisplayChildNodeText(node.ChildNodes[i], strValue);
}
if (intNodeFound) return;
}
private void FindNodeInHierarchy(string strSearchValue)
{
// If the TreeView control contains any root nodes, perform a
// preorder traversal of the tree and display the text of each node.
if (TreeView1.Nodes.Count > 0)
{
// Iterate through the root nodes in the Nodes property.
for (int i = 0; i < TreeView1.Nodes.Count; i++)
{
// Display the nodes.
CheckChildNodeText(TreeView1.Nodes[i], strSearchValue);
}
}
}
void CheckChildNodeText(TreeNode node, string strValue)
{
// Display the node's text value.
//Message.Text += node.Text + "<br />";
if (strValue == node.Text.ToString())
{
m_bNodeFound = true;
}
// Iterate through the child nodes of the parent node passed into
// this method and display their values.
for (int i = 0; i < node.ChildNodes.Count; i++)
{
DisplayChildNodeText(node.ChildNodes[i], strValue);
}
if (m_bNodeFound) return;
}
}
}The result
What code should do or what I want in this case