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Posted 27 Jul 2009


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LINQ to XML to retrieve an element value by its attribute

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27 Jul 2009CPOL
Using LINQ to XML to retrieve an element value by its attribute.


This article tells us how to retrieve a value of an element depending on the attribute value.

The Scenario

I have a web site where I need to read some data as static but I want to be able to update it any time, so I decided to read it from an XML file and use LINQ to XML. After some time and a lot of searching here and there, I had a better understanding of the idea and so I decided to share it with every one.

Using the Code

We will make an XML file and a class to get the data from it:

  1. The XML file "Actions.xml":
  2. <?xml version="1.0" encoding="utf-8" ?>
    <Action id="SignIn">1</Action>
    <Action id="SignOut">2</Action>
    <Action id="Open">3</Action>
  3. The class "Actions.cs":
  4. We will make the class constructor the one which gets the data to our variables in the class.

    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Web;
    using System.Xml.Linq;
    public class Actions
        int signIn, signOut, open;
        public int SignIn
            get { return signIn; }
        public Actions()
            XElement xe = XElement.Load(@"C:\Users\ADELOooO\Documents\
            Visual Studio 10\WebSites\LinQReadXML\Actions.xml");
            var x = from a in xe.Elements("Action")
              Where a.Attribute("id").Value == "SignIn"
              select a.Value;
            signIn = int.Parse(x.First().ToString());

    We have used the signin variable as an example above, but you can use it with them all.

  5. The code behind the webpage to call the method is shown here:
  6. using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Web;
    using System.Web.UI;
    using System.Web.UI.WebControls;
    public partial class _Default : System.Web.UI.Page 
        protected void Page_Load(object sender, EventArgs e)
        protected void Button1_Click(object sender, EventArgs e)
            Actions a = new Actions();
            TextBox1.Text = a.SignIn.ToString();

Points of Interest

I used VSTS 10 beta to create this project. I hope that you find it helpful.


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Dev. Action
Software Developer (Senior)
Egypt Egypt
No Biography provided

Comments and Discussions

GeneralMy vote of 5 Pin
heracles maroudas8-Jul-11 0:58
Memberheracles maroudas8-Jul-11 0:58 
Generalhave a nested element f, seems Im wiriting the xmlDocument.Elements("StreetName") incorrect cant get a result Pin
69stephen29-Aug-10 5:13
Member69stephen29-Aug-10 5:13 
Im using LINQ to XML I have the xml I've retrieved from a server. here is the link to the file listing.xml

but for whatever reason I dont seem to be able pull just the node i want form the file the result of the query is always null
here is the code snippet
string queryURI = "****&Limit=1@Select=LIST_105";
        HttpWebRequest req2 = (HttpWebRequest)WebRequest.Create(queryURI);
        req2.AuthenticationLevel = System.Net.Security.AuthenticationLevel.MutualAuthRequested;
        req2.Credentials = new NetworkCredential("------", "-------"); //This line ensures the request is processed through Basic Authentication
        req2.ContentType = "text/xml" ;
        req2.Accept = "text/xml" ;
        req2.Method = "Post" ;
        HttpWebResponse response = (HttpWebResponse)req2.GetResponse();
        StreamReader reader = new StreamReader(response.GetResponseStream());
        string xml = reader.ReadToEnd();

            XDocument listing = XDocument.Parse(xml);
        clsStreetAddress streetAddress = (from s in listing.Elements("StreetAddress")
                                                select new clsStreetAddress
                                                    streetNumber = s.Element("StreetNumber").Value,
                                                    streetDirPrefix = s.Element("StreetDirPrefix").Value,
                                                    streetName = s.Element("StreetName").Value,
                                                    streetSufix = s.Element("StreetSufix").Value,
                                                    unitNumber = "4",
                                                    City = s.Element("City").Value,
                                                    PostalCode = s.Element("PostalCode").Value

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