如何编写Sql Joins到Linq

Question

如何在Linq中编写此SQL Join。

SELECT DISTINCT Facilities.Name, Workstations.Name  from Facilities
inner join  Workstations on Facilities.ID = Workstations.FacilityID
AND Facilities.id = ( CASE WHEN Facilities.id IN (19) THEN Workstations.FacilityID End)