問題的Linq查詢.NET MVC

Question

public ActionResult Performances(string id) 
    { 
     var query = 
    from f in _db.Production 
    join g in _db.Run on f.show equals g.Production.show 
    join l in _db.Performance on g.startDate equals l.runStartDate 
    where f.show == id 
    select new ShowPerformance 
    { 
     Venuename = g.venue, 
     Showname = f.show, 
     RunStart = g.startDate, 
     RunEnd = g.endDate, 
     PerformanceDate = l.performanceDate, 
     PerformanceTime = l.performanceTime 
    }; 


    return View(query.ToList()); 


    } 

查詢無法在昭和RUN1，並顯示出性能之間distuingish RUN2它只是複製所有演出昭和RUN1，並顯示出RUN2

Answer 1

我想這個問題可能是你如何連接性能運行/生產

var query = 
     from f in _db.Production 
     join g in _db.Run on new {f.show, f.year} equals new {g.show, g.year} 
     join l in _db.Performance on new {g.venue, g.startDate} equals new {l.venue, l.runStartDate} 
     where f.show == id 
     select new ShowPerformance 
     { 
      Venuename = g.venue, 
      Showname = f.show, 
      RunStart = g.startDate, 
      RunEnd = g.endDate, 
      PerformanceDate = l.performanceDate, 
      PerformanceTime = l.performanceTime 
     }; 

沒有類似的on g.runId equals l.runId那麼你會得到所有的perfor爲所有制作/運行而設計。