CSharp - Use LINQ to restrict the sequence of XML nodes to get comment only

Description

Use LINQ to restrict the sequence of XML nodes to get comment only

Demo

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

class Program//from  w  ww. jav  a  2  s .  c o  m
{
    static void Main(string[] args){
            XElement firstParticipant;
            
            //  A full document with all the bells and whistles.
            XDocument xDocument = new XDocument(
              new XDeclaration("1.0", "UTF-8", "yes"),
              new XDocumentType("Books", null, "Books.dtd", null),
              new XProcessingInstruction("BookCataloger", "out-of-print"),
              //  Notice on the next line that we are saving off a reference to the first
              //  Book element.
              new XElement("Books", firstParticipant =
                new XElement("Book",
                  new XComment("This is a new author."),
                  new XProcessingInstruction("AuthorHandler", "new"),
                  new XAttribute("type", "Author"),
                  new XElement("FirstName", "Joe"),
                  new XElement("LastName", "Ruby")),
                new XElement("Book",
                  new XAttribute("type", "Editor"),
                  new XElement("FirstName", "PHP"),
                  new XElement("LastName", "Python"))));
            
            foreach (XNode node in firstParticipant.Nodes().OfType<XComment>())
            {
              Console.WriteLine(node);
            }
    }
}

Result

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