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Using a Web Service to populate RadGrid

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Grid

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

Paulo asked on 11 Aug 2011, 05:58 PM

Hello.

In order to familiarize with the RadGrid component, I have created a small application whose grid is populated by a web service.

Default.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebApplication1._Default" %>

<%@ 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>

</head>

<body>

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

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

</telerik:RadScriptManager>

<telerik:RadGrid ID="RadGrid1" runat="server">

<MasterTableView>

<Columns>

<telerik:GridBoundColumn DataField="ID" HeaderText="ID" DataType="System.Int32" />

<telerik:GridBoundColumn DataField="Name" HeaderText="Name" DataType="System.String" />

</Columns>

</MasterTableView>

<ClientSettings>

<DataBinding Location="WebService.cs" SelectMethod="RetrieveRows" />

</ClientSettings>

</telerik:RadGrid>

</form>

</body>

</html>

WebService.cs:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.ServiceModel;

using Telerik.Web.UI;

namespace WebApplication1

{

[ServiceContract(Namespace = "")]

[System.Web.Script.Services.ScriptService]

public class WebService

{

public WebService ()

{

}

[OperationContract]

public Dictionary<string, object> RetrieveRows(int startRowIndex, int maximumRows, List<GridSortExpression> sortExpression, List<GridFilterExpression> filterExpression)

{

Dictionary<string, object> dictionary = new Dictionary<string, object>();

dictionary.Add("Data", new[] { new { ID = 1234, Name = "Test" }});

dictionary.Add("Count", 1);

return dictionary;

}

The compilation was successful, but the following error message was displayed at runtime by the built-in script debugger of Internet Explorer:
Line: 6563
Error: Sys.ArgumentException: Cannot deserialize empty string.
Parameter name: data

I would appreciate whether some assistance could be provided to solve this problem.

Last but not least:
a) I was wondering how the application could be implemented using a server-side binding solution.
b) What is Telerik's recommendation in regard to client versus server-side binding implementations using a web service?

Thank you in advance.
Paulo

Using a Web Service to populate RadGrid

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