The Descendants operator can be called on a sequence of elements or documents.
It returns a sequence of elements containing each source element's or document's descendant elements.
The Descendants operator has two prototypes. The First Descendants Prototype:
public static IEnumerable<XElement> Descendants<T> ( this IEnumerable<T> source ) where T : XContainer
This method is called on a sequence of elements or documents, as opposed to a single element or document.
The Second Descendants Prototype
public static IEnumerable<XElement> Descendants<T> ( this IEnumerable<T> source, XName name ) where T : XContainer
This version returns elements by the specified name in the output sequence.
using System; using System.Linq; using System.Xml.Linq; using System.Collections.Generic; class Program/*from w ww . j ava 2s. com*/ { 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.Descendants()) { Console.WriteLine("Descendant element: {0}", element); } } }