在Linq中转换SQL子查询

Question

如何在linq中转换子查询？我的疑问是：

select *
from Product 
where ID in 
(
   select distinct(sku.ProductId) 
   from SiteProducts sp
   inner join ProductSKU sku on sp.ProductId = sku.Id
   where sp.siteid = 2
)

Answer 1

from p in db.Product
where (from sp in db.SiteProducts
       join sku in db.ProductSKU on sp.ProductId equals sku.Id
       where sp.siteid == 2
       select sku.ProductId).Distinct().Contains(p.ID)
select p