EntityFramework Core 在结果中包含多级导航属性

Question

In EF Core, we can use .Include and .ThenInclude methods to load related data in queries. Let's take the example from the official documentation:

1. using (var context = new BloggingContext())
2. {
3.     var blogs = context.Blogs
4.         .Include(blog => blog.Posts)
5.            .ThenInclude(post => post.Author)
6.            .ThenInclude(author => author.Photo)
7.         .Include(blog => blog.Owner)
8.            .ThenInclude(owner => owner.Photo)
9.         .ToList();
10.}

In the example above, it included the Post.Author property and then the Author.Photo property using ThenInclude in lines 5 and 6.

But what if the Post entity has another navigation property that I want to include? If I use ThenInclude after line 6, it will be relative to the Photo property and if I use Include it will be relative back to the Blogs property. Is there any way to solve this directly in the query statement?

Answer 1

You can repeat identical Include s as often as you like (and deem sensible):

 var blogs = context.Blogs
     .Include(blog => blog.Posts)
        .ThenInclude(post => post.Author)
        .ThenInclude(author => author.Photo)
     .Include(blog => blog.Posts)
        .ThenInclude(post => post.Document)
     .Include(blog => blog.Posts)
        .ThenInclude(post => post. ...)