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RadGrid not showing records

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Grid

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

Cole asked on 08 Nov 2011, 06:12 AM

I have implemented a solution for a project that utilizes a RadGrid, custom filter controls, custom filtering, custom sorting, and custom paging. I am using LINQ2SQL for my datasource, and using the NeedDataSource event. Everything is working perfectly, except for when I try to filter a column using

ltcs = ltcs.Where(l => Object.Equals(l.status, null));

The pager is showing the correct number of records, as I am setting that using the VirtualItemCount property of the radgrid, but when the page loads, it is giving me the "No records to display" message inside the grid.

Below is the .aspx page, the .aspx.cs code behind, and the code for the custom filter control. I have been struggling for a while to figure this out, but can't for the life of me figure out why it wouldn't be working.

HELP ME PLEASE!!!

<%@ Page Title="" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true"

CodeFile="ListToCountList.aspx.cs" Inherits="ListToCountList" %>

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

<%@ Register TagPrefix="HU" Namespace="HumanUse.CustomControls" %>

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

<style type="text/css">

.wait, .wait *

{

cursor: wait !important;

}

</style>

</asp:Content>

<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="Server">

<asp:ScriptManager ID="ScriptManager1" runat="server">

</asp:ScriptManager>

<rad:RadAjaxManager ID="RadAjaxManager1" runat="server" OnAjaxRequest="RadAjaxManager1_AjaxRequest"

DefaultLoadingPanelID="RadAjaxLoadingPanel1">

<AjaxSettings>

<rad:AjaxSetting AjaxControlID="RadAjaxManager1">

<UpdatedControls>

<rad:AjaxUpdatedControl ControlID="RadGrid1" />

</UpdatedControls>

</rad:AjaxSetting>

<rad:AjaxSetting AjaxControlID="RadGrid1">

<UpdatedControls>

<rad:AjaxUpdatedControl ControlID="RadGrid1" LoadingPanelID="RadAjaxLoadingPanel1" />

</UpdatedControls>

</rad:AjaxSetting>

</AjaxSettings>

</rad:RadAjaxManager>

<rad:RadAjaxLoadingPanel ID="RadAjaxLoadingPanel1" runat="server" Height="430px"

Width="924px" Transparency="0">

<img alt="Loading..." src='<%= RadAjaxLoadingPanel.GetWebResourceUrl(Page, "Telerik.Web.UI.Skins.Default.Ajax.loading.gif") %>'

style="border: 0;" />

</rad:RadAjaxLoadingPanel>

<rad:RadCodeBlock ID="RadCodeBlock1" runat="server">

<script type="text/javascript">

function ShowViewForm(id, rowIndex) {

var grid = $find("<%= RadGrid1.ClientID %>");

var rowControl = grid.get_masterTableView().get_dataItems()[rowIndex].get_element();

grid.get_masterTableView().selectItem(rowControl, true);

var manager = GetRadWindowManager();

var window1 = manager.getWindowByName("ListToCountForm");

window1.setUrl("ListToCountForm.aspx?ltcid=" + id);

window1.show();

return false;

}

function refreshGrid(arg, rebindOnly) {

alert('Your changes have been saved successfully');

if (!arg && !rebindOnly) {

$find("<%= RadAjaxManager1.ClientID %>").ajaxRequest("Rebind");

}

else if (rebindOnly) {

$find("<%= RadAjaxManager1.ClientID %>").ajaxRequest("RebindOnly");

}

else {

$find("<%= RadAjaxManager1.ClientID %>").ajaxRequest("RebindOnly");

}

</script>

</rad:RadCodeBlock>

<rad:RadGrid ID="RadGrid1" runat="server" PageSize="25" GridLines="None" AllowCustomPaging="true" AllowFilteringByColumn="True" AllowPaging="True" AllowSorting="True" EnableLinqExpressions="false" AutoGenerateColumns="False">

<MasterTableView ClientDataKeyNames="assignment_id" AllowCustomPaging="true" AllowMultiColumnSorting="true" AllowCustomSorting="true" DataKeyNames="assignment_id" AutoGenerateColumns="False" AllowFilteringByColumn="True">

<Columns>

<rad:GridBoundColumn HeaderText="Segment" AllowFiltering="true" AllowSorting="true" DataField="segment_id" UniqueName="segment_id" DataType="System.Int32" SortExpression="segment_id" CurrentFilterFunction="EqualTo" ShowFilterIcon="false">

</rad:GridBoundColumn>

<rad:GridBoundColumn HeaderText="Photo Date" DataField="photo_date" DataType="System.DateTime" DataFormatString="{0:d}" SortExpression="photo_date" UniqueName="date" CurrentFilterFunction="EqualTo" ShowFilterIcon="false">

</rad:GridBoundColumn>

<HU:DistinctLTCValueDropDownFilterColumn FilterControlWidth="60" HeaderText="Initials" AllowFiltering="true" DataField="initials" UniqueName="initials" SortExpression="initials" ShowFilterIcon="false">

<ItemTemplate>

<%#Eval("initials") %>

</ItemTemplate>

</HU:DistinctLTCValueDropDownFilterColumn>

<HU:DistinctLTCValueDropDownFilterColumn FilterControlWidth="60" HeaderText="Zone" AllowFiltering="true" DataField="zone" UniqueName="zone" SortExpression="zone" ShowFilterIcon="false">

<ItemTemplate>

<%#Eval("zone")%>

</ItemTemplate>

</HU:DistinctLTCValueDropDownFilterColumn>

<HU:DistinctLTCValueDropDownFilterColumn FilterControlWidth="140" HeaderText="Field Office" AllowFiltering="true" DataField="FieldOffice" UniqueName="FieldOffice" SortExpression="FieldOffice" ShowFilterIcon="false">

<ItemTemplate>

<%#Eval("FieldOffice")%>

</ItemTemplate>

</HU:DistinctLTCValueDropDownFilterColumn>

<HU:DistinctLTCValueDropDownFilterColumn FilterControlWidth="100" HeaderText="Status" AllowFiltering="true" DataField="status" UniqueName="status" SortExpression="status" ShowFilterIcon="false">

<ItemTemplate>

<%#Eval("status")%>

</ItemTemplate>

</HU:DistinctLTCValueDropDownFilterColumn>

<rad:GridBoundColumn HeaderText="Last User" DataField="last_updated_user" ItemStyle-VerticalAlign="Top"

DataType="System.String" SortExpression="last_updated_user" AllowFiltering="true"

AllowSorting="true" CurrentFilterFunction="EqualTo"

ShowFilterIcon="false">

</rad:GridBoundColumn>

<rad:GridBoundColumn HeaderText="Last Update" DataField="last_update_date" ItemStyle-VerticalAlign="Top"

DataFormatString="{0:MM/dd/yyyy}" UniqueName="last_update_date" SortExpression="last_update_date"

AllowSorting="true" CurrentFilterFunction="EqualTo"

ShowFilterIcon="false">

</rad:GridBoundColumn>

<HU:DistinctLTCValueDropDownFilterColumn FilterControlWidth="50" HeaderText="Boating" AllowFiltering="true" DataField="boating" UniqueName="boating" SortExpression="boating" ShowFilterIcon="false">

<ItemTemplate>

<%#Eval("boating")%>

</ItemTemplate>

</HU:DistinctLTCValueDropDownFilterColumn>

<rad:GridTemplateColumn ItemStyle-VerticalAlign="Top" UniqueName="TemplateEditColumn"

AllowFiltering="True" HeaderText="Edit" HeaderStyle-Wrap="false">

<ItemTemplate>

<asp:HyperLink ID="EditLink" runat="server" Text="Edit"></asp:HyperLink>

</ItemTemplate>

<FilterTemplate>

<asp:Button runat="server" ID="btnFilter" Text="Filter" OnClick="btn_Click" />

<br />

<asp:Button runat="server" ID="btnClearFilter" Text="Clear" OnClick="btn_ClearClick" />

</FilterTemplate>

</rad:GridTemplateColumn>

</Columns>

</MasterTableView>

</rad:RadGrid>

<rad:RadWindowManager ID="RadWindowManager1" runat="server" Skin="Vista">

<Windows>

<rad:RadWindow Skin="Vista" ID="ListToCountForm" ClientIDMode="Static" RestrictionZoneID="main" ShowContentDuringLoad="false" runat="server"

Title="List To Count Form" Width="400px" Height="600px" ReloadOnShow="true" Modal="true" />

</Windows>

</rad:RadWindowManager>

</asp:Content>

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using Telerik.Web.UI;

using HumanUse;

using System.Configuration;

using System.Text.RegularExpressions;

public partial class ListToCountList : BasePage

{

protected void Page_Load(object sender, EventArgs e)

{

base.CheckSecurity(true);

RadGrid1.GroupingSettings.CaseSensitive = false;

RadGrid1.ItemDataBound += new Telerik.Web.UI.GridItemEventHandler(RadGrid1_ItemDataBound);

RadGrid1.NeedDataSource += new GridNeedDataSourceEventHandler(RadGrid1_NeedDataSource);

}

protected void btn_Click(object sender, EventArgs e)

{

RadGrid1.Rebind();

}

protected void btn_ClearClick(object sender, EventArgs e)

{

RadGrid1.MasterTableView.FilterExpression = "";

foreach (GridColumn c in RadGrid1.MasterTableView.Columns)

{

c.CurrentFilterValue = "";

}

RadGrid1.Rebind();

}

void RadGrid1_NeedDataSource(object source, GridNeedDataSourceEventArgs e)

{

WCSAerialDataContext db = new WCSAerialDataContext(ConfigurationManager.ConnectionStrings["WCS_AerialConnectionString"].ConnectionString);

IQueryable<vwLTC> ltcs = db.vwLTCs;

if (ShouldApplySortFilterOrGroup())

{

if (RadGrid1.MasterTableView.FilterExpression != "")

{

foreach (String s in RadGrid1.MasterTableView.FilterExpression.Replace("AND", "~").Split('~'))

{

string column = s.Substring(2, s.IndexOf("]", 2) - 2);

string value = "";

if (column != "segment_id")

{

value = RadGrid1.MasterTableView.FilterExpression.Substring(RadGrid1.MasterTableView.FilterExpression.IndexOf("'") + 1, RadGrid1.MasterTableView.FilterExpression.IndexOf("'", RadGrid1.MasterTableView.FilterExpression.IndexOf("'") + 1) - (RadGrid1.MasterTableView.FilterExpression.IndexOf("'") + 1));

}

else

{

value = RadGrid1.MasterTableView.FilterExpression.Substring(RadGrid1.MasterTableView.FilterExpression.IndexOf("=") + 2, (RadGrid1.MasterTableView.FilterExpression.IndexOf(")", RadGrid1.MasterTableView.FilterExpression.IndexOf("=") + 2) - (RadGrid1.MasterTableView.FilterExpression.IndexOf("=") + 2)));

}

if (value == "NULL")

value = null;

switch (column)

{

case "segment_id":

ltcs = ltcs.Where(l => l.segment_id == int.Parse(value));

break;

case "photo_date":

ltcs = ltcs.Where(l => l.photo_date == DateTime.Parse(value));

break;

case "initials":

if (value == null)

{

ltcs = ltcs.Where(l => Object.Equals(l.initials, null));

}

else

{

value = value.Replace("%", "");

ltcs = ltcs.Where(l => l.initials == value);

}

break;

case "zone":

if (value == null)

{

ltcs = ltcs.Where(l => Object.Equals(l.zone, null));

}

else

{

value = value.Replace("%", "");

ltcs = ltcs.Where(l => l.zone == value);

}

break;

case "FieldOffice":

if (value == null)

{

ltcs = ltcs.Where(l => Object.Equals(l.FieldOffice, null));

}

else

{

value = value.Replace("%", "");

ltcs = ltcs.Where(l => l.FieldOffice == value);

}

break;

case "status":

if (value == null)

{

ltcs = ltcs.Where(l => Object.Equals(l.status, null));

}

else

{

value = value.Replace("%", "");

ltcs = ltcs.Where(l => l.status == value);

}

break;

case "last_updated_user":

if (value == null)

{

ltcs = ltcs.Where(l => Object.Equals(l.last_updated_user, null));

}

else

{

value = value.Replace("%", "");

ltcs = ltcs.Where(l => l.last_updated_user == value);

}

break;

case "last_update_date":

ltcs = ltcs.Where(l => l.last_update_date == DateTime.Parse(value));

break;

case "boating":

if (value == null)

{

ltcs = ltcs.Where(l => Object.Equals(l.boating, null));

}

else

{

value = value.Replace("%", "");

ltcs = ltcs.Where(l => l.boating == value);

}

break;

}

if (RadGrid1.MasterTableView.SortExpressions.Count > 0)

{

foreach (GridSortExpression exp in RadGrid1.MasterTableView.SortExpressions)

{

switch (exp.FieldName)

{

case "segment_id":

if (exp.SortOrder == GridSortOrder.Ascending)

ltcs = ltcs.OrderBy(l => l.segment_id);