UseDatabaseNullSemantics仍会生成NULL检查

这行得通吗？如果删除（或（null并且为null））子句时发布的查询正确，那么我认为这将执行相同的查询。（这假定联接中没有逻辑错误，如其他文章中所建议。）

var query = (from i in _repo.Invoices    from o in _repo.Orders.Where(c => c.orderid == i.orderid)    from o2 in _repo.Orders.Where(c => c.linkedorderid == o.linkedorderid).DefaultIfEmpty()        where invoiceIds.Contains(i.invoiceid)    select new    {       i, o2    }).ToList();