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CheckedNodes.Count returns 0 when TreeView on Master Page

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TreeView

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2 Answers, 1 is accepted

answered on 03 Nov 2011, 08:46 PM

I solved it. The problem was that I was initiating the call to do the count from a RadButtonBar on the MasterPage. It was Redirecting to the page that had the routine on it when I should have been using reflection to execute the routine. Below is the working example that solves the problem.

<%@ Master Language="C#" AutoEventWireup="true" CodeFile="MasterPage.master.cs" Inherits="MasterPage" %>

<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %>

<!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>

<asp:ContentPlaceHolder ID="head" runat="server">

</asp:ContentPlaceHolder>

</head>

<body>

<form id="form1" runat="server">

<telerik:RadScriptManager ID="RadScriptManager1" runat="server">

</telerik:RadScriptManager>

<div>

<telerik:RadToolBar ID="RadToolBar1" runat="server" Height="35px" OnButtonClick="RadToolBar1_ButtonClick">

<Items>

<telerik:RadToolBarButton runat="server" ImageUrl="~/images/icon_link.gif" ToolTip="Link Assets"

Value="linkassets">

</telerik:RadToolBarButton>

</Items>

</telerik:RadToolBar>

<telerik:RadTreeView ID="RadTreeView1" runat="server" DataFieldID="ProductID" DataSourceID="SqlDataSource1"

DataTextField="ProductName" DataValueField="ProductName" CheckBoxes="True">

</telerik:RadTreeView>

<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:NorthwindConnection %>"

SelectCommand="SELECT TOP 10 [ProductID], [ProductName] FROM [Alphabetical list of products]">

</asp:SqlDataSource>

<asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server">

</asp:ContentPlaceHolder>

</div>

</form>

</body>

</html>

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

public partial class MasterPage : System.Web.UI.MasterPage

{

protected void Page_Load(object sender, EventArgs e)

{

}

protected void RadToolBar1_ButtonClick (object sender, Telerik.Web.UI.RadToolBarEventArgs e)

{

if (Page.AppRelativeVirtualPath.ToLower() == "~/default.aspx")

callContentFunction ("linkassets");

else

Response.Redirect ("Default.aspx?action=linkassets");

}

private object callContentFunction (string methodName, params object[] parameters)

{

Type contentType = this.Page.GetType ();

System.Reflection.MethodInfo mi = contentType.GetMethod (methodName);

if (mi == null) return null;

return mi.Invoke (this.Page, parameters);

}

}

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="Default"

MasterPageFile="~/MasterPage.Master" %>

<%@ MasterType VirtualPath="~/MasterPage.Master" %>

<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %>

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server">

<telerik:RadButton ID="RadButton1" runat="server" Text="RadButton" OnClick="RadButton1_Click">

</telerik:RadButton>

<telerik:RadTextBox ID="RadTextBox1" runat="server" Label="Count: ">

</telerik:RadTextBox>

</asp:Content>

using System;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Data;

using System.Configuration;

using System.Web.Security;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;

using Telerik.Web.UI;

public partial class Default : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

if (!IsPostBack)

{

String action = Request.QueryString["action"];

if (action != null)

{

if (action.ToLower () == "linkassets")

linkassets ();

}

protected void RadButton1_Click (object sender, EventArgs e)

{

linkassets ();

}

public void linkassets ()

{

RadTreeView RadTreeView1 = (RadTreeView)Master.FindControl ("RadTreeView1");

Int32 checkedCategories = RadTreeView1.CheckedNodes.Count;

RadTextBox1.Text = checkedCategories.ToString ();

}