treeview find problem

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I have a treeview that is generated with some data from a datatable.

I want to find a node and show them.

I can find... but i can't show.

Where is my problem?

Here is all my code...

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        string SERVER_NAME = Request.ServerVariables["SERVER_NAME"].ToString();
        MindResources._MetodosEstaticos.server = SERVER_NAME;
        BusinessLayer._MetodosEstaticos.setServer(SERVER_NAME);
        DataTable dtMenu = BusinessLayer._MetodosEstaticos.GetMenuTree();
        loadTreeMenu(tvMenu, dtMenu);
        tvMenu.CollapseAll();
    }
}

public TreeView loadTreeMenu(TreeView tvMenu, DataTable dtMenu)
{
    if (dtMenu.Rows.Count > 0)
    {
        foreach (DataRow menu in dtMenu.Select("Parent_Id=179"))
        {
            TreeNode ParentNode = new TreeNode();
            ParentNode.Text = menu["MenuName"].ToString();
            tvMenu.Nodes.Add(ParentNode);
            loadTreeSubMenu(ref ParentNode, int.Parse(menu["MenuCode"].ToString()), dtMenu);
        }
    }
    return tvMenu;
}

private void loadTreeSubMenu(ref TreeNode ParentNode, int ParentId, DataTable dtMenu)
{
    DataRow[] childs = dtMenu.Select("Parent_Id='" + ParentId + "'");
    foreach (DataRow dRow in childs)
    {
        TreeNode child = new TreeNode();
        child.Text = dRow["MenuName"].ToString();
        child.Value = dRow["MenuCode"].ToString();
        ParentNode.ChildNodes.Add(child);
        //Recursion Call
        loadTreeSubMenu(ref child, int.Parse(dRow["MenuCode"].ToString()), dtMenu);
    }
}

private void btnFind_Click(object sender, EventArgs e)
{
    //Usage
    TreeNode itemNode = null;
    foreach (TreeNode node in tvMenu.Nodes)
    {
        itemNode = FromID(tbSearch.Text, node);
        if (itemNode != null) break;
    }
}

public TreeNode FromID(string itemId, TreeNode rootNode)
{
    foreach (TreeNode node in rootNode.ChildNodes)
    {
        if (node.Text.Equals(itemId)) return node;
        TreeNode next = FromID(itemId, node);
        if (next != null) return next;
    }
    return null;
}

protected void btnProcurar_Click(object sender, EventArgs e)
{
    //Usage
    btnProcurar.Text = "Search";
    TreeNode itemNode = null;
    foreach (TreeNode node in tvMenu.Nodes)
    {
        itemNode = FromID(tbSearch.Text, node);
        if (itemNode != null)
        {
            itemNode.Selected = true;
            tvMenu.SelectedNode.Expand();
            btnProcurar.Text = "Yes!!!! i finally Found!!!!!";
            tvMenu.FindNode(itemNode.ValuePath);
            break;
        }
    }

}

ASP.NET

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="HRC.WebForm1" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head  runat="server">
    <title></title>
</head>
<body>
    <form id="form1"  runat="server">
    <div>
        <asp:TextBox runat="server" id="tbSearch"/><asp:Button Text="Procurar" id="btnProcurar" runat="server" onclick="btnProcurar_Click" />
        <asp:TreeView runat="server" ID="tvMenu" ExpandDepth="1"        
            NodeStyle-CssClass="treeNode"
            RootNodeStyle-CssClass="rootNode"
            LeafNodeStyle-CssClass="leafNode" ShowLines="true"
            >
            <LeafNodeStyle CssClass="leafNode" />
            <NodeStyle CssClass="treeNode" />
            <RootNodeStyle CssClass="rootNode" />
            <SelectedNodeStyle BackColor="Blue" BorderColor="Black" BorderStyle="Solid" 
                BorderWidth="2px" />
            

        </asp:TreeView>
    </div>
    </form>
</body>
</html>

Posted 19-Mar-14 23:01pm

Member 9639742

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lukeer · Answer 1 · 2014-03-19T23:32:00

Your problem, I suppose, is in the method btnFind_Click(). You're declaring an object of type TreeNode, eventually assigning something to it. But then, the method exits and therefore throws away your precious TreeNode instead of displaying it.

Put the displaying code here:

C#

private void btnFind_Click(object sender, EventArgs e)
{
    //Usage
    TreeNode itemNode = null;
    foreach (TreeNode node in tvMenu.Nodes)
    {
        itemNode = FromID(tbSearch.Text, node);
        if (itemNode != null) break;
    }

    // Display the node just found.
    if( itemNode != null)
    {
        DisplayTreeNodeInfo(ItemNode);
    }
}

Of course, You will have to write a method DisplayTreeNodeInfo() suitable exactly for your needs.