大神，帮忙看一下关于匿名参数的问题

[念叨悠悠]

怎样同时限制T，S的类型？

public interface IServiceBase<T, S> where T : class, new()
    {
        ResultModel Add(S model);

        ResultModel Delete(S model);

        ResultModel Edit(S model);

        PagerModel GetPagerList(Expression<Func<T, bool>> predicate, int limit, int offset);

        List<S> GetList(Expression<Func<T, bool>> predicate);

    }

[巴士上的邂逅]

        public interface IServiceBase<T, S>
            where T : class, new()
            where S : class, new()
        {
            ResultModel Add(S model);
            ResultModel Delete(S model);
            ResultModel Edit(S model);
            PagerModel GetPagerList(Expression<Func<T, bool>> predicate, int limit, int offset);
            List<S> GetList(Expression<Func<T, bool>> predicate);
        }

[念叨悠悠]

唉，我弱爆了。