将选定的匿名对象与另一个表连接

Question

我有加入

var result = 
    from a in dbContext.As
    join b in dbContext.Bs on a.Id equals b.A.Id
    select { A = a, Ds = b.AList.Select(listItem => listItem.ObjectOfTypeD) }
    join c in dbContext.Cs on ANONYMOUS_OBJECT.Ds.Id equals c.ObjectOfTypeD.Id

如何使用

dbContext.Cs

加入 select 子句的内容？

Answer 1

您可以在

into

之后通过

select

运算符继续查询语法LINQ表达式：

var result = 
    from a in dbContext.As
    join b in dbContext.Bs on a.Id equals b.A.Id
    select new { A = a, Ds = b.AList.Select(listItem => listItem.ObjectOfTypeD) }
    into s
    join c in dbContext.Cs on s.Ds.Id equals c.ObjectOfTypeD.Id
    select new { s, c };