Linq2Sql通过多列连接(通过OR操作符)

本文关键字:通过 OR 操作符 连接 Linq2Sql | 更新日期: 2023-09-27 18:13:29

现在我可以翻译了:

SELECT * 
FROM vectors as v
INNER JOIN points as p 
ON v.beginId = p.id OR v.endId = p.id

Into linq2sql语句?我想要这样写:

var query = from v in dc.vectors
            join p in dc.points on p.id in (v.beginId, v.endId)
            ...
            select ...;

我知道,我可以通过Union构造来完成这个任务,但是有没有比复制大部分查询更好的方法呢?

Linq2Sql通过多列连接(通过OR操作符)

在linq-to-sql中不能有on子句和or子句。你需要做的是:

var result = from v in dc.vectors
             from p in dc.points
             where p.id == v.beginId || p.id == v.endId
             select new { v, p };

相当于:

的sql
SELECT * 
FROM vectors as v,
     points as p 
WHERE v.beginId = p.id 
OR v.endId = p.id