Entity Framework Core:私有或受保护的导航属性 [英] Entity Framework Core: private or protected navigation properties

问题描述

是否可以以某种方式在 EFCore 中定义具有私有或受保护访问级别的导航属性以使此类代码工作:

Is it somehow possible to define navigation properties in EFCore with private or protected access level to make this kind of code work:

class Model {
   public int Id { get; set; }
   virtual protected ICollection<ChildModel> childs { get; set; }  
}

推荐答案

您有两个选择，在模型构建器中使用类型/字符串.

You have two options, using type/string inside the model builder.

modelBuilder.Entity<Model>(c =>
    c.HasMany(typeof(Model), "childs")
        .WithOne("parent")
        .HasForeignKey("elementID");
);

不能 100% 确定它适用于私有财产，但应该可以.

Not 100% sure it works with private properties, but it should.

modelBuilder.Entity<Model>(c =>
    c.HasMany(typeof(Model), nameof(Model.childs)
        .WithOne(nameof(Child.parent))
        .HasForeignKey("id");
);

或者使用支持字段.

var elementMetadata = Entity<Model>().Metadata.FindNavigation(nameof(Model.childs));
    elementMetadata.SetField("_childs");
    elementMetadata.SetPropertyAccessMode(PropertyAccessMode.Field);

或者尝试使用属性

var elementMetadata = Entity<Model>().Metadata.FindNavigation(nameof(Model.childs));
    elementMetadata.SetPropertyAccessMode(PropertyAccessMode.Property);

请注意，从 EF Core 1.1 开始，有一个问题:在所有其他 .HasOne/.HasMany 配置之后，必须最后完成元数据修改，否则会覆盖元数据.请参阅重新建立关系可能导致注释丢失.

Be aware, as of EF Core 1.1, there is a catch: The metadata modification must be done last, after all other .HasOne/.HasMany configuration, otherwise it will override the metadata. See Re-building relationships can cause annotations to be lost.

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