双连接查询返回多个相同的记录而不是唯一的记录

Question

我试图让一个人属于使用此查询的团队。问题在于它返回了人员所在团队的所有部门的团队（我得到了多个相同的记录）。我想我必须替换.contains，但我无法弄清楚，因为我是一个完整的newb，并且找不到任何有用的双连接示例。为了使其按预期工作，我必须改变什么？提前致谢。

public IQueryable<Team> GetTeamsByPersonID(int id) 
    { 
     return from t in entities.Teams 
       join d in entities.Departments 
       on t.TeamID equals d.TeamID 
       where (from p in entities.Person_Departments 
         join dep in entities.Departments 
         on p.DepartmentID equals dep.DepartmentID 
         where p.PersonID == id 
         select dep.TeamID).Contains(d.TeamID) 
       select t; 
    } 

Answer 1

尝试

return (
from t in entities.Teams 
from d in entities.Departments 
from p in entities.Person_Departments 
where t.TeamID == d.TeamID && p.DepartmentID == d.DepartmentID && p.PersonID == id 
select t 
).Distinct();