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Sunday, February 10, 2013

How to use LINQ query in XML data souce



Here I share the usage of LINQ in xml.Normally xml has been to store the data like a database. By using LINQ query we can easily search or retrieve the data from XML.
In a previous article I explained, How LINQ query used in List Collection. For your reference I have mention URL as below.


Now here I explain how to use LINQ query on XML
Take xml file like as structure as below………

Stud.xml

<students>
<student Group="A">
<name>raju</name>
<class>10th</class>
</student>
<student Group="A">
<name>raju</name>
<class>10th</class>
</student>
<student Group="B">
<name>raju</name>
<class>5th</class>
</student>
<student Group="C">
<name>rahman</name>
<class>5th</class>
</student>
<student Group="A">
<name>sekhar</name>
<class>7th</class>
</student>
<student Group="B">
<name>rahuk</name>
<class>8th</class>
</student>
</s</students>

First we need to add namespace to use XML class in LINQ.
using System.Xml.Linq;
then we need to use XDOCUMENT class to load XML file to apply LINQ query.
In First query I am going to search the name contains “Raju” bu using LINQ query


XDocument xd=XDocument.Load(Server .MapPath ("stud.xml"));
        var xmldata = from xm in xd.Descendants("student") where xm.Element ("name").Value .Equals ("raju")
                      select new
                      {
                          name = xm.Element("name").Value,
                          studclass = xm.Element("class").Value
                      };
        foreach (var post in xmldata)
        {
            Response.Write(post.name);
            Response.Write(post.studclass);
        }

Output:
1raju10th
raju10th
raju5th

In a second process now we can filter by group…
var xmldata1 = from xm1 in xd.Descendants("student")
                       where xm1.Attribute("Group").Value.Equals("A")
                       select new
                       {
                           name = xm1.Element("name").Value,
                           studclass = xm1.Element("class").Value
                       };

        foreach (var post1 in xmldata1)
        {
            Response.Write(post1.name);
            Response.Write(post1.studclass + "</br>" );
        }

Output:
raju10th
raju10th
sekhar7th

I hope now you have got an idea to LINQ in xml

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