如何在C#中从XML文件中检索属性

<?xml version="1.0" encoding="utf-8" ?>
<Books>
  <Book id="1" title="The Catcher in the Rye">
    <Author>J.D. Salinger</Author>
  </Book>
  <Book id="2" title="To Kill a Mockingbird">
    <Author>Harper Lee</Author>
  </Book>
</Books>

using System;
using System.Xml;

class Program
{
    static void Main()
    {
        // 加载XML文件
        XmlDocument xmlDoc = new XmlDocument();
        xmlDoc.Load("data.xml");

        // 获取所有的Book节点
        XmlNodeList bookNodes = xmlDoc.SelectNodes("//Book");

        foreach (XmlNode bookNode in bookNodes)
        {
            // 检索属性
            string id = bookNode.Attributes["id"].Value;
            string title = bookNode.Attributes["title"].Value;

            Console.WriteLine($"Book ID: {id}, Title: {title}");
        }
    }
}

if (bookNode.Attributes["id"] != null)
{
    string id = bookNode.Attributes["id"].Value;
}