XMLTextReader - Pass to XDocument.Load and interact

I've been thinking some more about this and you should be able to populate an XDocument dynamically using XNode.ReadFrom() and an XmlTextReader, rather than XDocument.Load().


Suppose, for example, we have this persons.xml file:



 
      Barack
      Obama
     

New York

 
 
      David
      Cameron
     

London

   
 
      Nicolas
      Sarkozy
     

Paris

   



Then the following code, if I've written it correctly, should create an XDocument using just the first Person node (ignoring the other two) and change the content of the Address node from New York to Washington:


using System;
using System.Xml;
using System.Xml.Linq;




class Program
{
   static void Main()
   {
       string m_sFile = "persons.xml";
       var persons = new XElement("Persons");
       XElement person = null;
       var settings = new XmlReaderSettings();
       settings.IgnoreWhitespace = true;


       using (var oReader = XmlTextReader.Create(m_sFile, settings))
       {
           oReader.ReadStartElement("Persons");
           
           int count = 1;


           while (oReader.Name == "Person")
           {
               person = (XElement)XNode.ReadFrom(oReader);
               person.Element("Address").Value = "Washington";
               if (count == 1) persons.Add(person);
               count++;                
           }
           
           oReader.ReadEndElement();
       }


       var doc = new XDocument();
       doc.Add(persons);
       Console.WriteLine(doc);
       Console.ReadKey(); 
   }
}


In practice, of course, you could do any manipulations you like as the file is read.