public long InsertCourseByUserId(long userId, Course course)
{
try
{
if (userId < 0)
{
throw new ArgumentException();
}
//根据userId找出teacher
UserInfo teacher = _iUserService.GetUserByUserId(userId); //会抛出ArgumentException和UserNotFoundException
course.Teacher = teacher;
long courseId = _iCourseDao.InsertCourseByUserId(course);
return(courseId);
}catch
{
throw;
}
}
