Linq join with an inner collection
- by bronze
Hi,
I am trying a LINQ to Object query on 2 collections
Customer.Orders
Branches.Pending.Orders (Collection within a collection)
I want to output each branch which is yet to deliver any order of the customer.
var match = from order in customer.Orders
join branch in Branches
on order equals branch.Pending.Orders
select branch;
This does not work, I get :
The type of one of the expressions in the join clause is incorrect. Type inference failed in the call to 'GroupJoin'.
From my search, I think this is because Order or collection of Orders does not implement equals.
If this query worked, it will still be wrong, as it will return a branch if the customer's and pending orders match exactly. I want a result if any of the order matches.
I am learning Linq, and looking for a approach to address such issues, rather than the solution itself.
I would have done this in SQL like this;
SELECT b.branch_name from Customers c, Branches b, Orders o
WHERE c.customer_id = o.customer_id
AND o.branch_id = b.branch_id
AND c.customer_id = 'my customer'
AND o.order_status = 'pending'
