这取决于您想要的行为.

It depends on what behavior you want.

• 返回 IList< T> 告诉呼叫者他们已经收到了他们请求的所有数据
• 返回 IEnumerable< T> 会告诉调用方他们需要遍历结果，并且可能会延迟加载结果.
• 返回 IQueryable< T> 告诉调用者，结果由Linq提供程序支持，该Linq提供程序可以处理某些类的查询，从而给调用者带来了形成高性能查询的负担.
li>

• Returning an IList<T> tells the caller that they've received all of the data they've requested
• Returning an IEnumerable<T> tells the caller that they'll need to iterate over the result and it might be lazily loaded.
• Returning an IQueryable<T> tells the caller that the result is backed by a Linq provider that can handle certain classes of queries, putting the burden on the caller to form a performant query.

尽管后者为调用者提供了很大的灵活性(假设您的存储库完全支持它)，但这是最难测试的，而且不确定性最低.

While the latter gives the caller a lot of flexibility (assuming your repository fully supports it), it's the hardest to test and, arguably, the least deterministic.