Select Data From XML With Where Clause Using LINQ to XML

Vijay Prativadi
12y
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Introduction

Today, in this article let's play around with one of the interesting and most useful concepts in LINQ to XML.

Question: What is select data from XML with where clause using LINQ to XML?

In simple terms "It provides flexibility to pull out the data from XML using a LINQ query by filtering the data based on element."

Step 1: Create a new "ASP.Net Web Forms Application", as in:

Step 2: The complete code of Employee.xml looks like this:

<?xml version="1.0" encoding="utf-8" ?>

<FirstName>Vijay</FirstName>

</Employee>

<FirstName>Ram Reddy</FirstName>

</Employee>

</Employees>

Step 3: The complete code of webform1.aspx looks like this:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="LINQtoXMLSelectApp.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="Select Data with Where Clause using LINQ to XML"

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

</td>

</tr>

<tr>

<asp:Button ID="Button1" runat="server" Text="Select Data" Font-Names="Verdana" Width="213px"

BackColor="Orange" Font-Bold="True" OnClick="Button1_Click" />

</td>

</tr>

<tr>

<br />

<asp:GridView ID="GridView1" runat="server" BackColor="LightGoldenrodYellow" BorderColor="Tan"

BorderWidth="1px" CellPadding="2" EnableModelValidation="True" ForeColor="Black"

GridLines="None" AutoGenerateColumns="False">

</PagerStyle>

<asp:BoundField DataField="FirstName" HeaderText="First Name" ReadOnly="true" />

<asp:BoundField DataField="Age" HeaderText="Age" ReadOnly="true" />

</Columns>

</asp:GridView>

</td>

</tr>

</table>

</div>

</center>

</form>

</body>

</html>

Step 4: 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 System.Xml.Linq;

namespace LINQtoXMLSelectApp

{

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

{

protected void Page_Load(object sender, EventArgs e)

{

}

protected void Button1_Click(object sender, EventArgs e)

{

XDocument document = XDocument.Load(@"c:\users\administrator\documents\visual studio 2010\Projects\LINQtoXMLSelectApp\LINQtoXMLSelectApp\Employee.xml");

var query = from r in document.Descendants("Employee") where (int)r.Element("Age") > 27 select new

{

FirstName = r.Element("FirstName").Value, Age = r.Element("Age").Value };

GridView1.DataSource = query;

GridView1.DataBind();

}

Step 5: The output of the application looks like this: