Yannick的答案是好的，但是，这里有一个替代方法：创建 IAccountService 具有查找和返回AccountId的逻辑。然后将该服务注入到您的 IPhotoService 。

Yannick's answer is a good, however, here's an alternative: create an IAccountService that has the logic to find and return the AccountId. Then inject that service into your IPhotoService.