c# - How can I directly fill join table generated by EF Core for many-to-many relationship?

Question

I have these entities:

public class Book
{
  public int Id { get; set; }
  public string Title { get; set; }
  public List<Genre> Genres { get; set; }
}

public class Genre
{
  public int Id { get; set; }
  public string Name { get; set; }
  public List<Book> Books { get; set; }
}

EF Core 5 can handle creating join table but how can I use this table and should I do it? For example, I'm sending response to add two existing genres to existing book (I have book and genres ids). I suppose it would be better to directly fill join table with this ids instead of first getting those entities from context and then adding Genre entities to Genres field of Book entity.

Answer 1

等待大神答复