public async Task <ActionResult> EditGrade(GradeEditViewModel model) { if (ModelState.IsValid) { var grade = await InstitutionManager.FindGradeByIdAsync(model.Id); if (grade == null) { ModelState.AddModelError("", "未找到此项grade"); return(View(model)); } grade.GradeNum = model.GradeNumber; await InstitutionManager.UpdateGradeAsync(grade); return(RedirectToAction("AllGrade")); } return(View(model)); }