Question

It seems like that after receiving an IQueryable, I am not able to modify the query to enable a sort. Here is the code snippet.
I am under the impression that with IQueryable (as opposed to do IEnumerable) I should be able to do what I am attempting.

using (oc1 = new NWEntities())
{
    string customerid = "ALFKI";
    var q = GetOrders((o) => o.CustomerID == customerid);

    q.OrderBy(o => o.ShipCity);   // DOES NOT WORK !!!!!!!!
    foreach (var x in q)
    {
        Console.WriteLine(string.Format("Order#:{0} City:{1} for Customer {2}",
                                    x.OrderID,
                                    x.ShipCity,
                                    customerid));
    }
}

// Returns IQueryable
IQueryable<Order> GetOrders(Expression<Func<Order, Boolean>> predicate)
{            
    return (oc1.Orders.Where(predicate));            
}

The output is somehow not sorted by City. Am I missing something obvious ?
Thank you for your time.

Answer 1

You need to store the result of OrderBy in another variable. You sorted the list, and then silently dropped the result, and did your iteration on the original:

var q = GetOrders(...);

// notice I store in **q2**
var q2 = q.OrderBy(o => o.ShipCity);
foreach (var x in q2)