public IActionResult OnPostDelete(long Id) { ResultNormal result = new ResultNormal(); try { var DelObj = _CourseSrv.GetCourseSchedule(Id); if (DelObj != null) { if (DelObj.ApplyNum > 0) { result.ErrorMsg = "已经有用户报名,不能删除此课程"; } else { _CourseSrv.DeleteCourseSchdule(DelObj); _CourseSrv.SaveChanges(); } } } catch (Exception ex) { result.ErrorMsg = ex.Message; } return(new JsonResult(result)); }