Sunday, 19 May 2013

LINQ- Hour 3 (LINQ to XML)


LINQ to XML

When we interact with XML using LINQ then it is known as LINQ to XML.
To work with XML in LINQ you have to add a namespace
using System.Xml.Linq.

I am taking the following xml file for an example:-

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

<Techaltum>

<student Code=”101”>
        <name>isha malhotra</name>
        <id> 1 </id>
        <course> asp.net </course>
    </student>

<student Code=”102”>
        <name>Avi malhotra</name>
        <id> 2 </id>
        <course> Web Designing </course>
    </student>

<student Code=”103”>
        <name>Neha</name>
        <id> 3 </id>
        <course> Java </course>
    </student>

</Techaltum>

If I consider this xml file then in this file first line is declaration. Techaltum is an element and in student element code is attribute.

First I will discuss how to declare all these in LINQ.

Syntax of Declaration in LINQ:-

XDeclaration dec = new XDeclaration("1.0", "utf-8", "yes");



Syntax of Element in LINQ:-

XElement student = new XElement("");

Syntax of Attribute in LINQ:-

XAttribute code;

Syntax of comment in LINQ:-

XComment comm = new XComment("");

Create complete xml file using LINQ

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;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        XDocument techaltum_doc = new XDocument(new XDeclaration("1.0", "utf-8", "yes"),
                new XElement("Techaltum",
                        new XElement("student", new XAttribute("code", "101"),
                            new XElement("name", "Isha Malhotra"), new XElement("id", "1"), new XElement("course", "asp.net")),
                        new XElement("student", new XAttribute("code", "102"),
                             new XElement("name", "Avi Malhotra"), new XElement("id", "2"), new XElement("course", "web Desiging")),
                        new XElement("student", new XAttribute("code", "103"),
                             new XElement("name", "Neha"), new XElement("id", "3"), new XElement("course", "Java"))
             )
             );


//storage of file
        techaltum_doc.Save(Server.MapPath("xml")+"/abc.xml");
    }
}


To store this file I simply created the folder name xml in my visual studio. After executing this code refresh this folder and you will get your file in this folder.



Figure 1

Hope you enjoyed the article.




1 comment:

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