Linq查詢有兩個多對多的關係

Question

我有以下的實體成立，我正在嘗試查詢：

• 商店
• StoreCapability。一家商店可以有多種功能（例如出售巧克力，很大） - 但不一定要有。
• 優惠。要約可能需要多個商店功能才能生效，但不需要任何要求。

Store -[m2m]- StoreCapability -[m2m]- Offer

所以有涉及五個表。

我希望能夠獲得以下使用LINQ：

• 給出一個報價，商店的列表，它的有效期爲
• 鑑於商店，可
的報價列表

使用SQL將有可能從商店的加入，StoreCapability，通過提供和存儲所提供的，然後組，只有獲得具有計數（）等於要求的提議具有數家門店。但是我不知道在哪裏這個LINQ的開始，因爲多對多表由實體框架隱離我而去。請任何人都可以幫助我如何做到這一點？

的SQL可能會與此類似：

SELECT Offers.Id, offers.Name, Stores.Id, Stores.Name FROM Offers 
--join to the capabilities that this offer needs 
LEFT OUTER JOIN StoreCapabilityOffers offerRequirements ON Offers.Id = offerRequirements.Offer_Id 
--join to stores which have capability 
LEFT OUTER JOIN StoreCapabilities ON offerRequirements.StoreCapability_Id = StoreCapabilities.Id 
--join to stores 
LEFT OUTER JOIN StoreStoreCapabilities storeCap ON offerRequirements.StoreCapability_Id = storeCap.StoreCapability_Id 
LEFT OUTER JOIN Stores on storeCap.Store_Id = Stores.Id 

GROUP BY Offers.Id, offers.Name, Stores.Id, Stores.Name 
-- get stores who have the right number of capabilities so all requirements are all met 
HAVING COUNT(*) = (
    select COUNT(*) from StoreCapabilityOffers x where x.Offer_Id = Offers.Id 
) 

實體如下：

public class Store 
{ 
    public int Id { get; set; } 
    public virtual ICollection<StoreCapability> Capabilities { get; set; } 
} 

public class StoreCapability 
{ 
    public int Id { get; set; } 
    public virtual ICollection<Store> Stores { get; set; } 
    public virtual ICollection<Offer> Offers { get; set; } 
} 

public class Offer 
{ 
    public int Id { get; set; } 
    public virtual ICollection<StoreCapability> StoreCapabilityRequirements { get; set; } 
} 

Answer 1

我覺得這樣的事情應該工作：

給出一個報價，商店的列表它是有效的：

var stores = from o in context.Offers 
      from c in o.StoreCapabilityRequirements 
      from s in c.Stores 
      where o.Id == 1 
      select s; 

給定一個商店，可用優惠清單：

var offers = from s in context.Stores 
      from c in s.Capabilities 
      from o in c.Offers 
      where s.Id == 1 
      select o;