使用LINQ从XML中选择子代节点和元素

<books>
  <book>
    <title>Book 1</title>
    <author>Author 1</author>
  </book>
  <book>
    <title>Book 2</title>
    <author>Author 2</author>
  </book>
</books>

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

class Program
{
    static void Main()
    {
        // 加载XML文档
        XDocument doc = XDocument.Load("books.xml");

        // 使用LINQ查询语法选择子代节点
        var books = from book in doc.Descendants("book")
                    select book;

        // 遍历并输出选择的子代节点
        foreach (var book in books)
        {
            Console.WriteLine("Title: " + book.Element("title").Value);
            Console.WriteLine("Author: " + book.Element("author").Value);
            Console.WriteLine();
        }

        // 使用LINQ查询语法选择子代元素
        var titles = from title in doc.Descendants("title")
                     select title;

        // 遍历并输出选择的子代元素
        foreach (var title in titles)
        {
            Console.WriteLine("Title: " + title.Value);
        }
    }
}