如何將以下SQL查詢轉換爲Lambda表達式？

Question

我有一個下面SQL query我怎麼能轉換爲lambda表達

select * from ContractItems where ID in (SELECT distinct contractItemId from ContractPackageItems where contractPackageId in (SELECT ID from ContractPackage where ContractID = 680))

從上述查詢我需要知道，如果行存在與否。如果存在行，則返回true。

-TIA

---更新--- 這是我得到了，但它不工作

(from contractItem in _entities.ContractItems 
where contractItem.ID == (from contractPackageItems in _entities.ContractPackageItems 
where contractPackageItems.ContractPackageID == (from contractPackage in _entities.ContractPackages where contractPackage.ContractID == contractId select contractPackage.ID) select contractPackageItems.ContractItemId).Distinct()).Any(); 

Answer 1

這會不會你想要什麼不能做？

var results = (from ci in _entities.contractItems 
       join cpi in _entities.contractPackageItems on ci.ID equals cpi.contractItemId 
       join cp in _entities.contractPackage on cpi.contractPackageId equals cp.ID 
       where cp.ContractID = 680 
       select ci).Any();