<ExtensionAttribute()>
Public Overloads Shared Function Filter
    (Of TQuery As ITypedEntityQuery,
     T As Class)( _
   ByVal query As TQuery, _
   ByVal filter As Func(Of IQueryable(Of T),IQueryable(Of T)) _
) As TQuery

Dim query As TQuery
Dim filter As Func(Of IQueryable(Of T),IQueryable(Of T))
Dim value As TQuery
 
value = EntityQueryExtensions.Filter(Of TQuery, T)(query, filter)

[ExtensionAttribute()]
public static TQuery Filter<TQuery,T>( 
   TQuery query,
   Func<IQueryable<T>,IQueryable<T>> filter
)
where TQuery: ITypedEntityQuery
where T: class

[ExtensionAttribute()]
public:
static TQuery^ Filtergeneric<typename TQuery>
generic<typename T>
( 
   TQuery^ query,
   Func<IQueryable<T^>^,IQueryable<T^>^>^ filter
) 
where TQuery: ITypedEntityQuery
where T: ref class

public void FilteringSample() {
  // Query for all customers.  A filter will be applied prior to execution.
  var mgr = new DomainModelEntityManager();
  mgr.Querying += new EventHandler<EntityQueryingEventArgs>(mgr_Querying);
  var list = mgr.Customers.ToList();
}

// Client-side filtering in the EM.Querying event handler
private void mgr_Querying(object sender, EntityQueryingEventArgs e) {
  EntityQueryFilterCollection clientFilters = new EntityQueryFilterCollection();
  clientFilters.AddFilter<Customer>(q => q.Where(c => c.Country == "UK"));
  e.Query = e.Query.Filter(clientFilters);
}