LINQ到SQL問題

Question

找到所有的客戶，其購買的是小於10000

var Customer = from c in _NorthWindDataContext.Customers 
       join o in _NorthWindDataContext.Orders on c.CustomerID equals o.CustomerID 
       group c by c.CustomerID into CutGroup 
       where CutGroup.Sum(tab => tab.Orders.Sum(t => t.Order_Details.Sum(t1 => t1.Quantity * t1.Quantity))) < 10000 
       select new 
       { 
        CustomerID = CutGroup.Key, 
        Total = CutGroup.Sum(tab => tab.Orders.Sum(t => t.Order_Details.Sum(t1 => t1.Quantity * t1.Quantity))), 
       }; 

我已經解決了，但如果我想然後訪問Order表信息我怎麼能訪問...

爲了您的信息，我結合顧客電網....所以如果我理解你想要正確地什麼我不能使用每個

Answer 1

，你可以試試這個：

var Customer = from c in _NorthWindDataContext.Customers 
       join o in _NorthWindDataContext.Orders on c.CustomerID equals o.CustomerID 
       group c by c.CustomerID into CutGroup 
       where CutGroup.Sum(tab => tab.Orders.Sum(t => t.Order_Details.Sum(t1 => t1.Quantity * t1.Quantity))) < 10000 
       select new 
       { 
        CustomerID = CutGroup.Key, 
        Total = CutGroup.Sum(tab => tab.Orders.Sum(t => t.Order_Details.Sum(t1 => t1.Quantity * t1.Quantity))), 

        Orders = from os in _NorthWindDataContext.Orders where os.CustomerID == CutGroup.Key select os, 
       };