问实体框架将嵌套的对象作为单独的文档插入Cosmos Db

EN

public class Author
    {
        public Guid AuthorId { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public DateTime BirthDate { get; set; }
        public List<Book> Books { get; set; }
    }

public class Book
    {
        public Guid BookId { get; set; }
        public string Title { get; set; }
        public Author Author { get; set; }
    }

public class BookStoreDbContext:DbContext
    {
        private static readonly string EndpointUri = ConfigurationManager.AppSettings["EndPointUri"];
        private static readonly string PrimaryKey = ConfigurationManager.AppSettings["PrimaryKey"];
        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
        optionsBuilder.UseCosmos(
                EndpointUri,
                PrimaryKey,
                databaseName: "BookStoreDb");
        }

        public DbSet<Author> Authors { get; set; }
        public DbSet<Book> Books { get; set; }
    }

using (var context = new BookStoreDbContext())
            {
                context.Database.EnsureCreated();

                var authors = new List<Author>
                {
                    new Author
                    {
                        AuthorId = Guid.NewGuid(),
                        FirstName ="Meredith",
                        LastName ="Alonso",
                        BirthDate = DateTime.Parse("1970-09-01"),
                        Books = new List<Book>()
                        {
                            new Book { BookId=Guid.NewGuid(), Title = "Introduction to Microeconomics"}
                        }
                    }
                };

                context.Authors.AddRange(authors);
                context.SaveChanges();
            }