多左外连接查询

Question

我正在搜索Linq左外连接查询语法，我很难找到一个好的答案。我的特定SQL查询是：

Select tblBpGood.barcode, tblBPGood.Code, Name, RetailPrice, GoodGroupID, tblBPGoodGroupL.Description, 
  PurchaseUnitTypeID, SalesUnitTypeID, tblBPUnitTypeL.Description as SalesUnitType, 
  tblBPUnitTypeL_1.Description as PurchaseUnitType 
from tblBPGood 
left outer join tblBPGoodGroupL 
on tblBPGood.GoodGroupID = tblBPGoodGroupL.ID  
left outer join tblBPUnitTypeL 
on tblBPGood.SalesUnitTypeID = tblBPUnitTypeL.id  
left outer join tblBPUnitTypeL as tblBPUnitTypeL_1 
on tblBPGood.PurchaseUnitTypeID = tblBPUnitTypeL_1.id