I've got a DBQuery<T>
which converts to an IQueryable<T>
(this bit works fine). But then I'm trying to convert the IQueryable to an ObjectQuery .. which fails :-
public void Foo(this IQueryable<T> source)
{
// ... snip ...
ObjectQuery<T> objectQuery = source as ObjectQuery<T>;
if (objectQuery != null)
{
// ... do stuff ...
}
}
This used to work before I changed over to Entity-Framework 4 CTP5 Magic Unicorn blah blah blah. Now, it's not working - ie. objectQuery
is null
.
Now, DBQuery<T> inherits IQueryable<T>
.. so I thought this should work.
If i change the code to ..
var x = (ObjectQuery<T>) source;
then the following exception is thrown :-
System.InvalidCastException: Unable to cast object of type 'System.Data.Entity.Infrastructure.DbQuery
1[Tests.Models.Order]' to type 'System.Data.Objects.ObjectQuery
1[Tests.Models.Order]'.
Any suggestions?
DbQuery<T>
contains Include
method so you don't need to convert to ObjectQuery
. ObjectQuery
is not accessible from DbQuery
instance - it is wrapped in internal type InternalQuery
and conversion operator is not defined.
Btw. when you add using System.Data.Entity
and refrence CTP5 you will be able to call Include
on IQueryable<T>
!