LINQ的嵌套表3深

Question

我已經建立2級嵌套的LINQ查詢爲：

var data = (from p in Departments 
      join e in Employees on p.Id equals e.EmpId into emp 
      select new { p,emp }).ToList().Dump(); 

結果

Department - EmpName - EmpName Department - EmpName - EmpName

我需要添加另一個層面得到每個員工DateWorked名單。

這裏是最終的查詢結果應該什麼樣子：

Department - EmpName -DateWorked -DateWorked - EmpName -DateWorked -DateWorked Department - EmpName -DateWorked -DateWorked - EmpName -DateWorked -DateWorked

我如何添加到我目前的查詢來獲取使用LINQ第三嵌套列表？

Answer 1

你可以做一個內部查詢：

var data = (
from p in Departments 
join e in Employees on p.Id equals e.DeptId into emp 
select new {p, employees=(from s in emp 
          join d in DateWorked on s.Id equals d.EmpId into dts 
          select new {s, dts}) 
      }).ToList().Dump(); 

Answer 2

你可以設置你的navigation properties，然後只需查詢告訴它你想要什麼：

var data=db.Departments 
    .Include(d=>Employees) 
    .Include(d=>Employees.Select(e=>e.DatesWorked)) 
    .ToList();