Question

我有一个名为Workbook的表，它与表“Revisorsberetning”有1对多的关系，这与Project有多对一的关系。所以：工作簿 - ＆gt; Revisorsberetning - ＆gt;项目

我只想获得一个与给定WorkbookId

的工作簿相关的项目列表

我尝试将以下SQL（SQL工作）转换为LINQ，但没有运气：

select Project.PROJECT_NAME
from Project
inner join dbo.Revisorsberetning
on dbo.Revisorsberetning.Project_ProjectId = dbo.Project.ProjectId
inner join dbo.Workbook
on dbo.Workbook.WorkbookId = 2

这是LINQ（LinqPAD，这就是为什么你看到projectS而不是dbcontext）查询似乎无法正常工作：

var sss = from u in Projects
join uc in Revisorsberetnings on u.ProjectId equals uc.Project.ProjectId
join c in Workbooks on uc.Workbook.WorkbookId  equals c.WorkbookId
where c.WorkbookId == 2
select u.PROJECT_NAME;

Answer 1

尝试此变体

var sss = from u in Projects
          join uc in Revisorsberetnings on u.ProjectId equals uc.Project.ProjectId
          from c in Workbooks
          where c.WorkbookId == 2
          select u.PROJECT_NAME;

LINQ双连接语句

1 个答案: