如何使用FluentAPI添加等效的OwnedAttribute？ [英] How do you add the equivalent of the OwnedAttribute using FluentAPI?

问题描述

如果不使用TrackState上的属性或为发布商+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？

I can't seem to do this without using either the attribute on TrackState or specifying OwnsOne for Publishers + Articles. Is there any way i can globally mark TrackState as an owned type without using the attribute?

（适用于通过Google来的人：如何使用流利的api向实体添加属性？）

(for people comming through google: How do you add attributes to entities using fluent api?)

（实体+ EF核心位于单独的库中，我不希望对EF有依赖性）

(Entities + EF core are in seperate libraries and i do not want a dependency there on 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);
    }
}

推荐答案

您可以使用 ModelBuilder之一拥有方法重载：

modelBuilder.Owned<TrackState>();

或

modelBuilder.Owned(typeof(TrackState));

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