<ExtensionAttribute()>
Public Overloads Shared Function ToQuery(Of T As {Class, IEntity})( _
   ByVal entities As RelatedEntityList(Of T) _
) As EntityQuery(Of T)

Dim entities As RelatedEntityList(Of T)
Dim value As EntityQuery(Of T)
 
value = EntityQueryExtensions.ToQuery(Of T)(entities)

[ExtensionAttribute()]
public static EntityQuery<T> ToQuery<T>( 
   RelatedEntityList<T> entities
)
where T: class, IEntity

[ExtensionAttribute()]
public:
static EntityQuery<T^>^ ToQuerygeneric<typename T>
( 
   RelatedEntityList<T^>^ entities
) 
where T: ref class, IEntity

var mgr = new DomainModelEntityManager();

var customer = mgr.Customers.FirstOrNullEntity();
var orders = customer.OrderSummaries;
var query = orders.ToQuery();