如何從SQL查詢轉換爲LINQ

Question

我是新來的LINQ，如何將下面的SQL查詢轉換爲LINQ

SELECT WorkingHoursID 
    FROM WorkingHours 
except 
    ( 
     SELECT WorkingHoursID 
     FROM Schedule 
     WHERE Date = '2016-08-25' 
    GROUP BY WorkingHoursID    
     HAVING COUNT(WorkingHoursID) >= 8 
    ) 

Answer 1

使用Except方法，你可以做這樣的事情：

var schedules = (from s in DBCon.Schedule 
       where s.Date == new DateTime(2016, 8, 25) 
       group s by s.WorkingHoursID into g 
       where g.Count() >= 8 
       select g.Key).ToList(); 

var result = DBCon.WorkingHours.Select(item => item.WorkingHoursID).Except(schedules);