c# - 如何使用 GraphDiff 更新具有抽象类型集合的实体？

Question

我有一些模型：

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

    public virtual ICollection<AbstractEntity> CollectionA {get; set;}
}

public abstract class AbstractEntity
{
    public int Id {get; set;}
}

public class DerivedEntityA : AbstractEntity
{
    public virtual ICollection<AnotherType> CollectionB {get; set;} 
}

public class DerivedEntityB : AbstractEntity
{
    public string Name {get; set;}
}

上述模型的关系是这样的：

 RootEntity ---> ICollection<AbstractEntity>
                                 ┗━━ DerivedEntityA ---> ICollection<AnotherType>
                                 ┗━━ DerivedEntityB
 --->    has a
┗━━  derived from

现在我想更新一个使用 GraphDiffRootEntity命名的实体：rootEntity

 context.UpdateGraph(rootEntity, map => map
             .OwnedCollection(r => r.CollectionA, with => with
                 .OwnedCollection(de => de.CollectionB)  // this doesn't work because 'de' doesn't have 'CollectionB'
                 )
     );

那么如何正确更新呢？