如何轉換SQL內連接來拉姆達LINQ查詢

Question

我在LINQ是新的查詢 ，我需要幫助，我的樣本SQL查詢轉換爲LINQ拉姆達查詢

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

Answer 1

有兩種不同的方法，你可以使用時GRecommendations是一個集合。

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*/} 
);