Question

Example scenario:
Two tables: order and orderItem, relationship One to Many.
I want to select all orders that have at least one orderItem with price 100 and at least one orderItem with price 200.
I can do it like this:

var orders = (from o in kontextdbs.orders
              join oi in kontextdbs.order_item on o.id equals oi.order_id
              join oi2 in kontextdbs.order_item on o.id equals oi2.order_id
              where oi.price == 100 && oi2.price  == 200
              select o).Distinct();      

But what if those conditions are user generated?
So I dont know how many conditions there will be.

Answer 1

You need to loop through all the values using a Where and Any method like this:

List<int> values= new List() { 100, 200 };

var orders = from o in kontextdbs.orders
             select o;
foreach(int value in values)
{    
      int tmpValue = value;
      orders = orders.Where(x => kontextdbs.order_item.Where(oi => x.id == oi.order_id)
                                                      .Any(oi => oi.price == tmpValue));    
}

orders = orders.Distinct();