LINQ getting distinct records based on an item value - linq

Question

I have following LINQ query
var unallocatedOrders = (from orderLine in context.OrderLineItemDboes
where (orderLine.Status == unallocated || orderLine.Status == null)
&& orderLine.orderline.order.order_status_fk == verified
group orderLine
by new { orderLine.orderline.ol_id,orderLine.orderline.order.order_id }
into g
select new { OrderLineId = g.Key.ol_id, Count = g.Count(), OrderId = g.Key.order_id })
.ToList();
Above query giving me results in the following way
Order1 ol1 2
order1 ol2 3
order1 ol3 1
order2 ol1 1
order2 ol2 2
order3 ol1 4
order3 ol2 3
order3 ol3 2
I need to iterate through the above list based on order ids and need to fetch corresponding lines and quantity.
I need to get this line id and quantity to a Dictionary.
Can somebody suggest how can I get it done.
Thanks

Answer 1

Here's how you can select the items using GroupBy. (Your question doesn't really specify how you want to use the lines, so I just output them to the Debug console.)
// group by the OrderId
foreach (var group in unallocatedOrders.GroupBy(row => row.OrderId))
{
Debug.WriteLine(
// for each line, output "Order x has lines y1, y2, y3..."
string.Format("Order {0} has lines {1}",
// here the key is the OrderId
group.Key,
// comma-delimited output
string.Join(", ",
// select each value in the group, and output its OrderLineId, and quantity
group.Select(item =>
string.Format("{0} (quantity {1})", item.OrderLineId, item.Count)
)
)
)
);
}
You can get a dictionary lookup by using ToDictionary.
// two-level lookup: 1) OrderId 2) OrderLineId
var lookup = new Dictionary<int, Dictionary<int, long>>();
foreach (var group in unallocatedOrders.GroupBy(row => row.OrderId))
{
// add each order to the lookup
lookup.Add(group.Key, group.ToDictionary(
// key selector
keySelector: item => item.OrderLineId,
// value selector
elementSelector: item => item.Count()
));
}