How to sort XML document in linq by an attribute value?

I've tried to sort my xml file by attribute's value with no luck.

data.Descendants("person").OrderBy(x => x.Attribute("id").Value);

data contains:

<persons>
  <person id="1">
    <name>Abra</name>
    <age>25</age>
  </person>
  <person id="2">
    <name>Cadabra</name>
    <age>29</age>
  </person>
  <person id="4">
    <name>Hokus</name>
    <age>40</age>
  </person>
  <person id="3">
    <name>Pokus</name>
    <age>30</age>
  </person>
</persons>

Answer given here does not work for me.

I'm using MVS 2010 for Windows Phone 7.

I would be grateful for any help.

--

Update

Thank You for quick responses!

juharr asked a good question... i was expecting that OrderBy would modify data. Now i know i was wrong.

I want to modify data and i've done as follows (thanks Matt Lacey):

var people = data.Elements("person").OrderBy(p => (string)p.Attribute("id"));

    data.Descendants("person").Remove();
    data.Element("persons").Add(people);

but i still got nothing. Data is empty, it contains only <persons />

I wonder what's wrong now.

I manage to solve my problem by using this code:

    XDocument datatemp = new XDocument(data);

    var people = datatemp.Descendants("person").OrderBy(x开发者_运维知识库 => (int)int.Parse(x.Attribute("id").Value));

    data.Descendants("person").Remove();
    data.Element("persons").Add(people);

Is any other way (more elegant) to modify data using OrderBy instead of creating datatemp?

Based on the question you linked to, this works:

var people = from p in data.Elements("person")
             orderby (string)p.Attribute("id")
             select p;

or

var people = data.Elements("person").OrderBy(p => (string)p.Attribute("id"));

(tested on a phone to confirm too.)

I hope this helps you

var people = data.Elements("person").OrderBy(p => (string)p.Attribute("id")).ToArray();

data.Descendants("person").Remove();
data.Element("persons").Add(people);

Don't forget to use the ToArray() method for your people.