Update Data Using OData Service Via EDM Framework

Introduction

Today, in this article let's play around with one of the interesting and most useful conceptsw in OData.

Question: What is updating data using OData Service via EDM Framework?

In simple terms "It provides flexibility to update the data with the help of data services using the EDM framework".

Step 1: Create a new web application

Step 2: Add a new ADO.NET entity data model, as in:

Step 3: Add the service reference of the OData Service, as in:

Step 4: Create a new web application, as in:

Step 5: Browse the service, as in:

Step 6: The complete code of ODataService.svc.cs

using System;

using System.Collections.Generic;

using System.Data.Services;

using System.Data.Services.Common;

using System.Linq;

using System.ServiceModel.Web;

using System.Web;namespace UpdateODataApp

{

public class ODataService : DataService< CompanyEntities >

{

// This method is called only once to initialize service-wide policies.public static void InitializeService(DataServiceConfiguration config)

{

// TODO: set rules to indicate which entity sets and service operations are visible, updatable, etc.

// Examples:config.SetEntitySetAccessRule("*", EntitySetRights.All);

// config.SetServiceOperationAccessRule("MyServiceOperation", ServiceOperationRights.All);

config.DataServiceBehavior.MaxProtocolVersion = DataServiceProtocolVersion.V2;

}

Step 7: Add the service reference to the new web application, as in:

Step 8: The complete code of WebForm1.aspx looks like this:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="WebApplication1.WebForm1" %>

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

</head>

<body>

<div>

<table>

<tr>

<asp:Label ID="Label1" runat="server" Text="Update Data with OData Service via EDM Framework"

Font-Bold="true" Font-Size="Large" Font-Names="Verdana" ForeColor="Maroon"></asp:Label>

</td>

</tr>

<tr>

<td>

<asp:Label ID="Label6" runat="server" Text="Please Enter Employee Id" Font-Size="Large"

Font-Names="Verdana" Font-Italic="true"></asp:Label>

</td>

<td>

<asp:TextBox ID="TextBox4" runat="server"></asp:TextBox>

</td>

</tr>

<tr>

<td>

<asp:Label ID="Label2" runat="server" Text="Please Enter FirstName" Font-Size="Large"

Font-Names="Verdana" Font-Italic="true"></asp:Label>

</td>

<td>

<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>

</td>

</tr>

<tr>

<td>

<asp:Label ID="Label3" runat="server" Text="Please Enter LastName" Font-Size="Large"

Font-Names="Verdana" Font-Italic="true"></asp:Label>

</td>

<td>

<asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>

</td>

</tr>

<tr>

<td>

<asp:Label ID="Label4" runat="server" Text="Please Enter Age" Font-Size="Large" Font-Names="Verdana"

Font-Italic="true"></asp:Label>

</td>

<td>

<asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>

</td>

</tr>

<tr>

<td>

<asp:Label ID="Label7" runat="server" Text="Please Enter Location" Font-Size="Large"

Font-Names="Verdana" Font-Italic="true"></asp:Label>

</td>

<td>

<asp:TextBox ID="TextBox5" runat="server"></asp:TextBox>

</td>

</tr>

<tr>

<asp:Button ID="Button2" runat="server" Text="Update Data" Font-Names="Verdana" Width="166px"

BackColor="Orange" Font-Bold="True" OnClick="Button2_Click" />

</td>

</tr>

<tr>

<asp:Label ID="Label5" runat="server" Font-Bold="true" Font-Names="Verdana" ForeColor="Maroon"></asp:Label>

</td>

</tr>

</table>

</div>

</center>

</form>

</body>

</html>

Step 9: The complete code of WebForm1.aspx.cs looks like this:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using WebApplication1.ServiceReference1;namespace WebApplication1

{

public partial class WebForm1 : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

}

protected void Button2_Click(object sender, EventArgs e)

{

if (string.IsNullOrEmpty(TextBox1.Text) || string.IsNullOrEmpty(TextBox2.Text) ||

string.IsNullOrEmpty(TextBox3.Text) || string.IsNullOrEmpty(TextBox4.Text)||string.IsNullOrEmpty(TextBox5.Text))

{

Label5.Text = "Please Enter Some Values";

Label5.ForeColor = System.Drawing.Color.Red;

}

else

{

var updateQuery = (from r in objEntities.Employee where r.EmpId == int.Parse(TextBox4.Text) select r).Single();

updateQuery.FirstName = TextBox1.Text;

updateQuery.LastName = TextBox2.Text;

updateQuery.Age = int.Parse(TextBox3.Text);

updateQuery.Location = TextBox5.Text;

objEntities.UpdateObject(updateQuery);

objEntities.SaveChanges();

Label5.Text = "Data Updated Successfully";

Label5.ForeColor = System.Drawing.Color.Green;

TextBox1.Text = string.Empty;

TextBox2.Text = string.Empty;

TextBox3.Text = string.Empty;

TextBox4.Text = string.Empty;

TextBox5.Text = string.Empty;

}

#region Instance MembersCompanyEntities objEntities = new CompanyEntities(new Uri("http://localhost:5430/ODataService.svc/"));

Update Data Using OData Service Via EDM Framework

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