linq中的子查询

本文关键字：查询 linq | 更新日期: 2023-09-27 18:04:30

用linq编写这个查询的最佳方式是什么?

SELECT *
  FROM product_master
  where product_id in (select product_id from product where buyer_user_id=12)

linq中的子查询

var _result =   from a in product_master
                where (product.Where(s => s.buyer_user_id == 12))
                        .Contains(a.product_ID)
                select a;

或

var _result =   (from a in product_master
                join b in product
                    on a.product_id equals b.product_id
                where b.buyer_user_id == 12
                select a).Distinct();

JW的答案是正确的。或者，假设子查询不相关，您可以单独表示它:

var pids = product.Where(p => p.buyer_user_id == 12);
var r = product_master.Where(pm => pids.Contains(pm.product_id));
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