ef group 封装

表达式树，传递 group 

public class Test<T> where T : class
    {
        MoviesEntities db = new MoviesEntities();
        public virtual List<IGrouping<S,T>> FindList<S>(Expression<Func<T, S>> groupBy)
        {
            var _list = db.Set<T>().AsNoTracking().GroupBy<T, S>(groupBy);
             
            return _list.ToList();
        }
    }

调用

Test<Movies> t = new Test<Movies>();
            var q = t.FindList(x => new { x.ID, x.ImageType });

结果：