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.Net Code

            using (testEntities TestEntity = new testEntities())
            {
                #region linq to entities 内容练习2
                #region 父子关系表查询
                /*
                var maxScorePerClass = from s in TestEntity.stuinfo
                                       group s by s.classID into s1
                                       select new
                                       {
                                           classid = s1.Key,
                                           stuinfo = from s2 in s1
                                                     where s2.score == s1.Max(p => p.score)
                                                     select s2
                                       };