如何在LINQ中编写此查询c＃

Question

$sql = "SELECT * FROM installment WHERE SellorderID = (";
$sql .= "SELECT ID FROM sellorder WHERE ShopID = (";
$sql .= "SELECT ID FROM shop WHERE Number = $shopno)) AND Received = 0";

$shopno是函数的参数。

Answer 1

试试这个：

from i in Installment
join so in SellOrder 
   on i.SellOrderId equals so.ID
join sh in Shop
   on so.ShopId equals sh.Id
where sh.Number == $shopno && i.Received == 0
select i

Answer 2

这是一个开放式的问题 您的目标解决方案是否要使用LinqToSql，实体框架，本地数据源或...... ??

我建议您查看本指南，了解C＃中的LinqToSql。

Simple LINQ to SQL in C#

希望它有所帮助。