public async Task <dynamic> OnCreateGroupsAsync([FromForm] int courseID, [FromForm] int groupCount, [FromForm] int maxCount, [FromForm] string token)
        {
            try
            {
                var t = await tokenService.GetTokenAsync(token);

                if (t == null)
                {
                    throw new Exception("请先登录");
                }
                if (t.Role != UserRole.Admin)
                {
                    var uc = await courseService.GetUserCourseAsync(t.UserID, courseID);

                    if (uc == null || uc.UserRole == UserRole.Student)
                    {
                        throw new Exception("权限不足");
                    }
                }

                await courseService.AddCourseGroupAsync(courseID, groupCount, maxCount);

                return(new { Res = true });
            }
            catch (Exception e)
            {
                return(new { Res = false, Error = e.Message });
            }
        }