为什么我们不能在聚合中具体实现基本接口？

Question

在实现接口时，为什么不能在聚合中具体实现基本接口？违反哪个OOP原则？StorageEntitySas本质上是IStorageEntitySas类型public interface IValetKeyResponse{    IStorageEntitySas Sas { get; set; }    string UploadUrl { get; set; }}public class ValetKeyResponse : IValetKeyResponse{    //Which OOP, principle is violating here? StorageEntitySas is essentially of type IStorageEntitySas    **public StorageEntitySas Sas { get; set; }**    public string UploadUrl { get; set; }}public class StorageEntitySas : IStorageEntitySas{    public string Credentials { get; set; }    public Uri BlobUri { get; set; }    public string Name { get; set; }}