如何转换SQL内连接来拉姆达LINQ查询

Question

我在LINQ是新的查询 ，我需要帮助，我的样本SQL查询转换为LINQ拉姆达查询

select * from GRecommendations 
inner join GSections 
on GRecommendations.GSectionId = GSections.Id 
where GSections.GaId = 646 

Answer 1

有两种不同的方法，你可以使用时GRecommendations是一个集合。

var arrResult = //UNTESTED 
    GRecommendations 
    .Join(GSections.Where(sec => sec.GaId.Equals(646)), 
    rec => rec.GeSectionId, 
    sec => sec.Id, 
    (REC, SEC) => new { /*put here what you want selected*/ } 
    ); // 

或

var arrResult = 
(
    from rec in GRecommendations 
    join rec in GSections.Where(s => s.GaId.Equals(646)) on rec.GSectionId equals sec.GaId 
    select new {/*rec.something*/, /*sec.something*/} 
);