如何使用 FluentAPI 添加与 OwnedAttribute 等效的东西？

Question

如果不使用 TrackState 上的属性或为 Publishers + 文章指定 OwnsOne，我似乎无法做到这一点。有什么方法可以在不使用属性的情况下将 TrackState 全局标记为拥有的类型？

（对于通过 google 访问的人：如何使用 fluent api 向实体添加属性？）

（实体 + EF 核心在单独的库中，我不希望在那里依赖 EF）

public class Publisher
{
    public int Id { get; set; }

    public string Name { get; set; }

    public virtual ICollection<Article> Articles { get; set; } = new List<Article>();

    public TrackState State { get; set; }
}

public class TrackState
{
    public DateTime? Created { get; set; }

    public DateTime? Modified { get; set; }
}

public class Article
{
    public int Id { get; set; }

    public int PublisherId { get; set; }

    public string Content { get; set; }

    public TrackState State { get; set; }
}


public class CustomContext : DbContext
{
    public CustomContext()
    {
    }

    public CustomContext(DbContextOptions options) : base(options)
    {
    }

    public DbSet<Publisher> Publishers { get; set; }

    public DbSet<Article> Articles { get; set; }

    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    {
        optionsBuilder.UseSqlServer("Server=(localdb)\\mssqllocaldb;Database=BananaDb;Trusted_Connection=True;");
        //          base.OnConfiguring(optionsBuilder);
    }

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        // one of the attempts i would have expected to work.
        modelBuilder.Entity<TrackState>().HasAnnotation("Owned", true);
        base.OnModelCreating(modelBuilder);
    }
}

Answer 1

您可以使用ModelBuilder.Owned方法重载之一：

modelBuilder.Owned<TrackState>();

或者

modelBuilder.Owned(typeof(TrackState));