关于Linq左连接[重复]

Posted 2023-02-24

【中文标题】关于Linq左连接[重复]

【英文标题】：About Linq left join [duplicate]

【发布时间】：2017-09-28 04:36:17

【问题描述】：

select A.Name,B.UserId
from [dbo].[SentryBoxs] as A
left join [dbo].[SentryBoxUsers] as B on A.ID = B.SentryBoxId
and B.UserId = '970500c2-51bd-443e-ae10-585455f2b326'

linq如何实现？？？

【问题讨论】：

在这里回答：***.com/questions/3404975/left-outer-join-in-linq

对我很有帮助。非常感谢！

【参考方案1】：

var ans = from A in dboSentryBoxs
          join B in dboSentryBoxUsers on new  A.ID, UserID = "970500c2-51bd-443e-ae10-585455f2b326"  equals new  ID = B.SentryBoxId, B.UserID  into Bjoin
          from B in Bjoin.DefaultIfEmpty()
          select new  A.Name, B.UserID ;