关于Linq左连接

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如何通过linq实现？？？

这里回答：对我很有帮助。非常感谢！

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'

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 };