具有继承和RIA服务的实体框架模型

Question

We have an entity framework model with has some inheritance in it.

The following example is not the actuall model, but just to make my point...

Let's say

Base class: Person Child classes: Employee, Customer

The database has been generated, the DomainService has been created and we can get to the data:

lstCustomers.ItemsSource = context.Persons;
EntityQuery<Person> query = context.GetPeopleQuery().Take(4);
context.Load(query);

But how can I modify the query to only return Customers ?

Answer 1

Have you already tried the following:

context.GetPeopleQuery().OfType<Customer>().Take(4)

I can imagine this doesn't have the required effect though, because the OfType is probably evaluated client-side..