public void PostDelete(int gradeID)
{
int _code = 0;
string _message = "删除年级失败";
_code = _gradeService.DeleteGradeByID(gradeID);
if (_code > 0)
{
_message = "删除年级成功";
}
else
{
_message = "对不起，修改失败！";
}
RenderText("{\"code\":\"" + _code + "\",\"message\":\"" + _message + "\"}");
CancelLayout();
}