Entity Framework 事务

代码如下：

public int AddNoteAndNoteMarkDown(MyNoteFile myNoteFile, MyNoteMarkDown myNoteMarkDown)
        {
            using (var transaction = _cnBlogContext.Database.BeginTransaction())
            {
                try
                {
                    _cnBlogContext.MyNoteFile.Add(myNoteFile);
                    _cnBlogContext.SaveChanges();
                    myNoteMarkDown.NoteId = myNoteFile.Id;
                    _cnBlogContext.MyNoteMarkDown.Add(myNoteMarkDown);
                    _cnBlogContext.SaveChanges();
                    transaction.Commit();
                    return 1;
                }
                catch (Exception)
                {
                    transaction.Rollback();
                    return -1;
                }
            }
        }