LINQ to Entities 不识别方法

               var query = (from s in _context.Series
                            where SqlMethods.Like(s.Abbreviation.Substring(0,2), "[0-9]")
                            select s).OrderBy(s => s.Abbreviation).ToList();
               seriesList = query.OrderBy(s => s.Abbreviation).ToList();

想查出来首字母是数字的怎么查啊请赐教不要.ToList()之后判断

[解决办法]
where SqlMethods.Like(s.Abbreviation, "[0-9]%")