如何使用左连接在 linq 中编写 sql 查询

【问题标题】：how to write sql query in linq with left join如何使用左连接在 linq 中编写 sql 查询
【发布时间】：2016-11-09 13:33:33
【问题描述】：

select 
    pm.GenerationID, srv.ServiceID, srv.ServiceName, srv.ServiceDescription, 
    srv.IsProPack, pm.MonthlyPrice, pm.AnnualPrice, ss.freeExpirationDate 
from 
    tbl_BILLING_PricingModels pm 
    inner join tbl_BILLING_Services srv on pm.ServiceID = srv.ServiceId 
    left join tbl_BILLING_SubscribedServices ss on srv.ServiceID = ss.ServiceId 
        and ss.ClientId='3B345E8B-3E6C-40E6-A4B8-E6371B717018' 
where 
    pm.GenerationID = 5 order by srv.ServiceID

如何编写 linq 查询？

【问题讨论】：

标签： asp.net entity-framework linq linq-to-entities

【解决方案1】：

请注意，我无法对此进行测试，但如果不正确，您可以按照以下说明操作：

var p = from pm in tbl_BILLING_PricingModels 
        join srv in tbl_BILLING_Services on pm.ServiceID equals srv.ServiceId nto res
        from ss tbl_BILLING_SubscribedServices on srv.ServiceID = ss.ServiceId && ss.ClientId='3B345E8B-3E6C-40E6-A4B8-E6371B717018' 
        where pm.GenerationID = 5 
        order by srv.ServiceID
        select new { pm.GenerationID,
        srv.ServiceID,
        srv.ServiceName,
        srv.ServiceDescription,
        srv.IsProPack }

【讨论】：