如何使用 linq to xml 将列表保存在对象内？

Question

我正在尝试在 XDocument 中保存带有嵌套列表的对象列表。那么如何实现呢？

我有一堂课：

public class Book
{
    public string Id { get; }
    public string Title { get; set; }
    public string Isbn { get; set; }
    public List<string> Authors { get; set; }
    public int Pages { get; set; }
    ...
}

还有一个类来存储它：

public class FileBookStore : IEntryStore<Book>
{
    private List<Book> loadedBooks;
    private string filename;
    ...


    private static async Task<IEnumerable<Book>> ReadDataAsync(string filename)
    {
        ...
        IEnumerable<Book> result = XDocument.Parse(text)
            .Root
            .Elements("book")
            .Select(e =>
                new Book
                {
                    Title = e.Attribute("title").Value,
                    Isbn = e.Attribute("isbn").Value,
                    Authors = new List<string>() //and here
                });
        return result;
    }

    static async Task SaveDataAsync(string filename, IEnumerable<Book> books)
    {
        XDocument root = new XDocument(
            new XElement("catalog", 
                books.Select(n =>
                    new XElement("book",
                        new XAttribute("title", n.Title ?? ""),
                        new XAttribute("isbn", n.Isbn ?? ""),
                        //stuck in a line below 
                        new XElement("authors", books.Select(n => new XElement("author"), new XAttribute("name"))),
                        new XAttribute("pages", n.Pages),
                        new XAttribute("year", n.Year),
                        new XAttribute("publisher", n.Publisher ?? "")))));

        using (StreamWriter writer = new StreamWriter(filename))
        {
            await writer.WriteAsync(root.ToString()).ConfigureAwait(false);
        }

    }

我对这部分完全感兴趣。如何在集合中保存和加载对象？

Answer 1

改变你坚持的路线：

//stuck in a line below 
new XElement("authors", n.Authors.Select(x => new XElement("author", new XAttribute("name",x)))),