如何在一个查询中从2个表中选择2个对象？

Question

我想通过linq方法（例如.Where，.Select等）在一次查询中获得以下结果，

内部联接更好。

new {
    Blog = MyDbContext.Blogs.SingleOrDefault(b => b.Url == "xxx.com"),
    Post = MyDbContext.Posts.SingleOrDefault(p => p.Blog.Url == "xxx.com" &&
                                                  p.Author == "Jack")
}

型号：

public class Blog 
{
    public int BlogId { get; set; }
    public string Url { get; set; }

    public List<Post> Posts { get; set; }
}

public class Post 
{
    public int PostId { get; set; }
    public string Author { get; set; }

    public Blog Blog { get; set; }
}

public class MyDbContext 
{
    public DbSet<Blog> Blogs { get; set; }
    public DbSet<Post> Posts { get; set; }
}

Answer 1

var ans = MyDbContext.Blogs.Where(b => b.Url == "xxx.com")
                           .Select(b => new {
                                   Blog = b,
                                   Post = b.Posts.Where(p => p.Author == "Jack").FirstOrDefault()
                            })
                            .SingleOrDefault();