如何在LINQ C＃中使用选择查询联接实体对象

Question

select * from ABC a left outer join (select * from XYZ x)y on a.ID = y.ID

如何将上述查询转换为LINQ（C＃）

Answer 1

你可以用这个

from a in ABC
join y in (from x in XYZ select x ) on a.ID equals y.ID into temp
from z in temp.DefaultIfEmpty()
select z