实体框架:在不接触EF生成的类的情况下，用接口扩展分部类

我的问题与这篇文章类似：实体框架中的接口继承

因此，我复制了这个例子，并针对我的问题进行了修改：

public interface IBaseEntity
{
    DateTime CreatedOn { get; set; }
    string CreatedBy { get; set; }
}
// The following two classes are generated by Entity Framework
public partial class SomeEntity
{
    public int SomeEntityId { get; }
    public string Name { get; set; }
    public DateTime CreatedOn { get; set; }
    public string CreatedBy { get; set; }
}
public partial class OtherEntity
{
    public int OtherEntityId { get; }
    public float Amount { get; set; }
    public DateTime CreatedOn { get; set; }
    public string CreatedBy { get; set; }
}

我想做的是：

public partial class SomeEntity : IBaseEntity
    {
        // No code needed here because the other partial class
        // already has the needed properties
    }

但后来我得到了以下错误：

Error 64 '[...].SomeEntity' does not implement interface member '[...]IBaseEntity.CreatedOn'
Error 64 '[...].SomeEntity' does not implement interface member '[...]IBaseEntity.CreatedBy'

很明显，我也能看到
但我认为编译后，分部类会变成一个，这样编译器就不应该抱怨了。

有什么想法吗？

提前感谢！