public async Task CountGroupGradeBySerminarIdAsync(long seminarId)
{
////调用SeminarGroupService中的ListSeminarGroupBySeminarId 方法
var seminarGroupList = await _iSeminarGroupService.ListSeminarGroupBySeminarIdAsync(seminarId);
await _iGradeDao.CountGroupGradeBySerminarIdAsync(seminarId, seminarGroupList);
}
