Linq從3個表格中使用Joiner表格查詢

Question

我有3個表格，Customer，Surfboards和CustomerSurfboards。 CustomerSurfboards是Joiner表。

Customer  CustomerSurfBoards Surfboards 
---------- ------------------- ------------ 
CustomerID CustomerSurfboardID SurfBoardID 
IsActive  CustomerID 
       SurfboardID 

我想選擇其中客戶IsActive =真

，我需要做Linq中使用C＃

Answer 1

var query = from sb in db.Surfboards 
      join csb in db.CustomerSurfBoards on sb.SurfBoardID equals csb.SurfBoardID 
      join c in db.Customers on csb.CustomerID equals c.CustomerID 
      where c.IsActive 
      select sb;