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Predicate description and typeof()
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sarmaad View Drop Down
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Joined: 18-Jul-2010
Location: Sydney
Posts: 15 		Post Options Post Options   Quote sarmaad Quote  Post ReplyReply Direct Link To This Post Topic: Predicate description and typeof()
    Posted: 30-Jun-2011 at 2:27am
Hi,

I am building query from IPredicateDescription s using PredicateBuilder.And and PredicateBuilder.Or methods. 

The case is like this:


I've got a pizza menu, with different pizza classes (PepperoniPizza, etc) deriving from Pizza.

Let's assume that each order has one pizza connected and that pizza is represented by order.pizza field of type Pizza in db.

I would like to construct a predicate like this:

select every order that (order.pizza istypeof (PepperoniPizza))

How can I do it, so that I would be able to combine it with other predicates?
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robertg View Drop Down
IdeaBlade
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Joined: 15-Mar-2011
Location: California
Posts: 87 		Post Options Post Options   Quote robertg Quote  Post ReplyReply Direct Link To This Post Posted: 30-Jun-2011 at 5:06pm
You're deriving your pizza classes from single-table inheritance in EF? If so, you should be able to query with something like mgr.ParentEntity.OfType<ChildEntity>();.Otherwise, how are you storing this data, and how are you differenciating between different kinds of pizza? Could you provide me with some more information on how you're organizing and accessing your data?
 
Thanks.


Edited by robertg - 30-Jun-2011 at 5:42pm
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