SQL 到 LINQ - AND 语句在左连接中

Question

我有这个SQL查询来获取所有未分配给指定警车的警察名称。

SELECT policename 
FROM police 
LEFT OUTER JOIN policecar
ON police.policeid = policecar.policeid
AND carid = 1
WHERE policecar.policeid IS NULL

我想将该查询转换为 LINQ，但我很难转换 AND 和 WHERE 语句。请给我任何方向，谢谢。

Answer 1

试试这个：

var result =
    from police in polices
    join policecar in policecars.Where(x => x.carid == 1)
            on police.policeId equals policecar.policeId into res
    where !res.Any()
    select police.policeName;