如何用LINQexpression式来压缩嵌套的对象

我正在尝试拼合这样的嵌套对象：

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 }, } 

我正在寻找的结果是以下扁平列表：

 "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？ 我可以用一个select新的，但我已经被告知一个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books的列表：

 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

我也试图做到这一点，从尤里的评论和凌乱的LINQPad我有这个..

请注意，我没有书，章，页，我有人（书），公司人（章）和公司（页）

 from person in Person join companyPerson in CompanyPerson on person.Id equals companyPerson.PersonId into companyPersonGroups from companyPerson in companyPersonGroups.DefaultIfEmpty() select new { ContactPerson = person, ContactCompany = companyPerson.Company }; 

要么

 Person .GroupJoin ( CompanyPerson, person => person.Id, companyPerson => companyPerson.PersonId, (person, companyPersonGroups) => new { person = person, companyPersonGroups = companyPersonGroups } ) .SelectMany ( temp0 => temp0.companyPersonGroups.DefaultIfEmpty (), (temp0, companyPerson) => new { ContactPerson = temp0.person, ContactCompany = companyPerson.Company } ) 

参考网站我用： http : //odetocode.com/blogs/scott/archive/2008/03/25/inner-outer-lets-all-join-together-with-linq.aspx

Answer 4

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