[英]Entity Framework define primary key as foreign key to another entity
I have read some answers but doesn't figure out my case ... 我已经阅读了一些答案,但不知道我的案情...
Let's say I have a BaseEntity
class like this: 假设我有一个像这样的
BaseEntity
类:
public abstract class BaseEntity<TKey> : IEntity<TKey>
{
/// <summary>
/// Gets or sets the key for all the entities
/// </summary>
[Key]
public TKey Id { get; set; }
}
And all my entities derive from this: 我所有的实体都来自于此:
public class A : BaseEntity<Guid> {
// ...props
}
So, when I try to create an entity, to have its primary key as another entity, I get an error 因此,当我尝试创建一个实体,使其主键作为另一个实体时,出现错误
EntityType 'X' has no key defined.
EntityType'X'没有定义键。 Define the key for this EntityType.
定义此EntityType的键。
My code: 我的代码:
public class X : BaseEntity<A> { // <-- doesn't accept it
// ...props
}
What am I doing wrong? 我究竟做错了什么?
Why is this kind of relation not accepted? 为什么这种关系不被接受?
If you want that PK also will be FK to another entity, you should do this: 如果您希望PK也将成为另一个实体的FK,则应执行以下操作:
public abstract class BaseEntity<TKey> : IEntity<TKey>
{
//[Key] attribute is not needed, because of name convention
public virtual TKey Id { get; set; }
}
public class X : BaseEntity<Guid>//where TKey(Guid) is PK of A class
{
[ForeignKey("a")]
public override Guid Id { get; set; }
public virtual A a { get; set; }
}
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