如何使用linq表达式展平嵌套对象

Question

我试图压扁这样的嵌套对象:

public class Book
{
    public string Name { get; set; }
    public IList<Chapter> Chapters { get; set; }
}

public class Chapter
{
    public string Name { get; set; }
    public IList<Page> Pages { get; set; }
}


public class Page
{
    public string Name { get; set; }
}

让我举个例子.这是我的数据

Book: Pro Linq 
{ 
   Chapter 1: Hello Linq 
   {
      Page 1, 
      Page 2, 
      Page 3
   },
   Chapter 2: C# Language enhancements
   {
      Page 4
   },
}

我要找的结果如下:

"Pro Linq", "Hello Linq", "Page 1"
"Pro Linq", "Hello Linq", "Page 2"
"Pro Linq", "Hello Linq", "Page 3"
"Pro Linq", "C# Language enhancements", "Page 4"

我怎么能做到这一点？我可以选择新的,但我被告知SelectMany就足够了.

Answer 1

myBooks.SelectMany(b => b.Chapters
    .SelectMany(c => c.Pages
        .Select(p => b.Name + ", " + c.Name + ", " + p.Name)));

Answer 2

假设books是一本书的清单:

var r = from b in books
    from c in b.Chapters
    from p in c.Pages
    select new {BookName = b.Name, ChapterName = c.Name, PageName = p.Name};

Answer 3

myBooks.SelectMany(b => b.Chapters
    .SelectMany(c => c.Pages
        .Select(p => new 
                {
                    BookName = b.Name ,
                    ChapterName = c.Name , 
                    PageName = p.Name
                });