顯示所有AD組的成員誰在表中都沒有

Question

我怎麼會在下面的SQL查詢轉換爲LINQ

select * 
from groupprincipal.members 
where displayname not in (select adusername 
          from employees) 

我想列出的Active Directory組不在員工表中的所有成員

我試圖

var notLoggedIn = from groupMembers in groupPrincipal.Members 
          from loggedIn in employeeRepository.All 
          where groupMembers.DisplayName != loggedIn.ActiveDirectoryName 
          select groupMembers; 

，但是你會知道它沒有工作。

Answer 1

var notLoggedIn = from groupMembers in groupPrincipal.Members 
        where !employeeRepository.Select(p=> p.adUserName).Contains(groupMembers.DisplayName) 
        select groupMembers; 

Answer 2

我相信這應該這樣做：的

var notLoggedIn = 
from groupMembers in groupPrincipal.Members 
where !(from loggedIn in employeeRepository.All 
     select loggedIn.ActiveDirectoryName).Contains(groupMembers.DisplayName) 
select notLoggedIn;