linq左外联问题

[TossShinHwa]

            var query = from board in dc.Board
                        join user in dc.User on board.username equals user.username into gj
                        from subuser in gj.DefaultIfEmpty()
                        select new
                        {
                            UID = board.UID,
                            UserName = board.username,
                            UserUID = (subuser == null ? -1 : subuser.UID),
                            Content = board.content,
                            Date = board.date
                        };

查询board表,根据board中的username查询user表中的UID,最终得到UserUID,若user表中不存在需要查询的username,则UserUID=-1


但是最终得到结果不包含user中没有username的项

相当于执行了内联表查询

请问哪出错了?

[TossShinHwa]

囧.

[TossShinHwa]

顶一下.