Linq outer加入

Question

如何將此查詢更改爲外連接，以便沒有訂單的客戶仍然出現在結果中？

Customers 
        .Join(
         Orders, 
         c => c.ID, 
         r => r.ID, 
         (c, r) => 
         new 
         { 
          Name = c.Name, 
          Address = c.Address, 
          OrderNumber = r.OrderNumber, 
          OrderDetails = r.OrderDetails 
         } 
        ).ToList() 

Answer 1

from c in context.Customers  
join o in context.order on new { cid = c.cid } equals new { cid = o.cid } into ljoin 
from l in ljoin.DefaultIfEmpty() 
select new() 
{ 
    //whatever 
};