public void DeleteRelation(Teach_Course teach_Course)
{
if (teach_Course == null)
{
throw new ArgumentNullException(nameof(teach_Course));
}
//判断TeacherId和CourseId是否存在
//外键依赖自动判断
_context.Teach_Courses.Remove(teach_Course);
}
public void UpdateRelation(Teach_Course teach_Course)
{
//_context.Entry(teach_Course).State = EntityState.Modified;
}
