CSharp - LINQ XML DescendantsAndSelf

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Introduction

The DescendantsAndSelf operator operates on a sequence of elements and returns a sequence containing each source element and its descendant elements.

Prototypes

The DescendantsAndSelf operator has two prototypes. The First DescendantsAndSelf Prototype: 

public static IEnumerable<XElement> DescendantsAndSelf (
  this IEnumerable<XElement> source
)

The Second DescendantsAndSelf Prototype 

public static IEnumerable<XElement> DescendantsAndSelf (
  this IEnumerable<XElement> source,
  XName name
)

This version returns elements by the specified name.

Demo

using System;
using System.Linq;
using System.Xml.Linq;
using System.Collections.Generic;

class Program/*from   w  w  w. j  av  a 2  s .c  o m*/
{
    static void Main(string[] args){
        XDocument xDocument = new XDocument(
          new XElement("Books",
            new XElement("Book",
              new XAttribute("type", "Author"),
              new XComment("This is a new author."),
              new XElement("FirstName", "Joe"),
              new XElement("LastName", "Ruby")),
            new XElement("Book",
              new XAttribute("type", "Editor"),
              new XElement("FirstName", "PHP"),
              new XElement("LastName", "Python"))));
              IEnumerable<XElement> elements =
                xDocument.Element("Books").Elements("Book");
        
              //  First, we will display the source elements.
              foreach (XElement element in elements)
              {
                Console.WriteLine("Source element: {0} : value = {1}",
                  element.Name, element.Value);
              }
        
              //  Now, we will display each source element's descendant elements.
              foreach (XElement element in elements.DescendantsAndSelf())
              {
                Console.WriteLine("Descendant element: {0}", element);
              }
    }
}

Result

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