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Problem with RadList view and Embedded Grid

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ListView

This is a migrated thread and some comments may be shown as answers.

Jack Voss asked on 21 Jan 2011, 11:50 PM

I am using the Telerik.Web.UI version 2010.3.1317.40
Visual Studio 2010 premium. .NET 4.0

I have a simple grid, embedded in a simple List View.

The data source for the list view is a Class Object.

When I get to the point that I am trying to get the list views key data value of customer number, it fails to set the parameter.

Let me post my code:

<%@ Page Language="c#" CodeBehind="AddressBook.aspx.cs" AutoEventWireup="True"

EnableViewState="true" Inherits="JDE.Reporting.AddressBook" MasterPageFile="~/MenuMaster.Master" %>

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

<asp:Content ID="WorkTracker" runat="server" ContentPlaceHolderID="MainPage">

<telerik:RadAjaxManager ID="RadAjaxManager1" runat="server">

</telerik:RadAjaxManager>

<telerik:RadStyleSheetManager ID="RadStyleSheetManager1" runat="server">

</telerik:RadStyleSheetManager>

<h2>

<asp:Label ID="lblReportHeader" runat="server"></asp:Label></h2>

<p>

<asp:Label ID="Label9" runat="server" Font-Bold="True" Font-Size="Large"

ForeColor="#3399FF"></asp:Label>

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

<telerik:RadSkinManager ID="RadSkinManager1" Runat="server" Skin="Windows7">

</telerik:RadSkinManager>

</p>

<telerik:RadListView ID="RLV_Address" runat="server"

DataKeyNames="CustomerNumber"

ItemPlaceholderID="Addresses"

onneeddatasource = "RLV_Address_NeedDataSource">

<LayoutTemplate>

<fieldset>

<legend>

Address

</legend>

<asp:PlaceHolder ID="Addresses" runat="server" />

</fieldset>

</LayoutTemplate>

<ItemTemplate>

<legend> <p> Customer Number: <%#Eval("CustomerNumber")%> </p><p>Customer Name : <%# Eval("CustomerName") %> </p> <p>Customer Type : <%# Eval("CustomerType") %> </p></legend>

<telerik:RadGrid ID="rgContacts" runat="server" AllowFilteringByColumn="False"

AllowPaging="False" AllowSorting="false" ClientSettings-AllowColumnHide="false"

AutoGenerateColumns="False" ShowGroupPanel="false" ShowFooter="true" EnableHeaderContextMenu="false"

OnNeedDataSource="RG_Contacts_NeedDataSource">

<MasterTableView CommandItemDisplay="None">

<RowIndicatorColumn>

<HeaderStyle Width="20px"></HeaderStyle>

</RowIndicatorColumn>

<ExpandCollapseColumn>

<HeaderStyle Width="20px"></HeaderStyle>

</ExpandCollapseColumn>

<Columns>

<telerik:GridBoundColumn DataField="CustomerNumber" HeaderText="CustomerNumber" UniqueName="CustomerNumber">

</telerik:GridBoundColumn>

<telerik:GridBoundColumn DataField="FullName" HeaderText="FullName" UniqueName="FullName">

</telerik:GridBoundColumn>

</Columns>

<NoRecordsTemplate>

<asp:Label ID="lblNoTotalsRecords" runat="server" CssClass="LabelBold" Text="No records for the filtering selections you have chosen."></asp:Label>

</NoRecordsTemplate>

</MasterTableView>

</telerik:RadGrid>

</ItemTemplate>

<ItemSeparatorTemplate>

<span style="color: Blue; font-weight: bold;"> :: </span>

</ItemSeparatorTemplate>

</telerik:RadListView>

<asp:PlaceHolder ID="Addresses" runat="server"></asp:PlaceHolder>

</asp:Content>

using System;

using System.Collections;

using System.ComponentModel;

using System.Configuration;

using System.Data;

using System.Data.SqlClient;

using System.Drawing;

using System.Web;

using System.Web.SessionState;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.HtmlControls;

using Telerik.Web.UI;

using System.Net.Mail;

using System.Collections.Generic;

using System.Text;

using JDEReporting.Code;

using Marlin.Utilities;

using System.Reflection;

namespace JDE.Reporting

{

// Remember to change the name of the class here to be the same value as is used

// in the inherit on the .aspx page.

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

{

// protected System.Web.UI.WebControls.Label lblTable;

Marlin.JDE.AddressBook.cAddressBooks mcAddressBooks;

protected void Page_Load(object sender, System.EventArgs e)

{

this.MaintainScrollPositionOnPostBack = true;

if (!IsPostBack)

{

// Get the name of the routine we are currently running.

MethodBase lmth = MethodBase.GetCurrentMethod();

string lsRoutineName = lmth.DeclaringType + "." + lmth.Name;

string lsReportName = MiscDBFuncs.GetReportTitle(Request.Url.Segments[Request.Url.Segments.Length - 1]);

lblReportHeader.Text = lsReportName;

Page.Title = lsReportName;

mcAddressBooks = new Marlin.JDE.AddressBook.cAddressBooks(345183, Session["UserName"].ToString().Trim());

}

protected void RLV_Address_NeedDataSource(object sender, RadListViewNeedDataSourceEventArgs e)

{

RLV_Address.DataSource = mcAddressBooks;

}

void RLV_Address_Item_ItemDataBound(object sender, RadListViewItemEventArgs e)

{

if (e.Item is RadListViewDataItem)

{

var grid = (RadGrid)e.Item.FindControl("RG_Contacts");

grid.Rebind();

}

protected void RG_Contacts_NeedDataSource(object source, Telerik.Web.UI.GridNeedDataSourceEventArgs e)

{

var parentItem = RLV_Address.NamingContainer as RadListViewDataItem;

if (parentItem.DataItem == null)

return;

int intID = (int)parentItem.GetDataKeyValue("CustomerNumber");

RadGrid rg_Contacts = (RadGrid)source;

rg_Contacts.DataSource = mcAddressBooks[intID].AddressBookContacts;

}

The error occurs in the Need Data source of the grid. When I try to set the parentiem, it is set to a value of null, or nothing.
I wind up with an error at the if(parentItem.DataItem == null) section of the code telling me that parentiem is null.

So, the code works for everything but this part, if I had code the intID to 0, and simply set the rg_Contacts.DataSource to mcAddressBooks[0].AddressBookContacts I get it to display, but simply with the 0 index of the class.

I would appreciate any help.

5 Answers, 1 is accepted

answered on 31 Jan 2011, 09:00 AM

Hi Jack,

I answered your question in the support ticket that you sent to us but I am posting it here as well, so other people with similar problem can use it:

The problem is that you are taking the NamingContainer of the RadListView, instead of the RadGrid object at the problemmatic place. The NamingContainer of the listview is the Page itself and it cannot be cast to RadListViewItem, therefore it is null. If you change this line:

var parentItem = RadListView1.NamingContainer as RadListViewDataItem;

to this:

var parentItem = (source as RadGrid).NamingContainer as RadListViewDataItem;

the exception goes away and the grids inside the listview get populated.

In order to avoid duplicate posts, please, if you have any other questions, post them in the formal support ticket.

Regards,
Tsvetina
the Telerik team

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