BuildingCoder.CmdCollectorPerformance.f3 C# (CSharp) Method

        void f3()
        {
            List<ElementFilter> a
            = new List<ElementFilter>( 3 );

              a.Add( new ElementClassFilter( typeof( Family ) ) );
              a.Add( new ElementClassFilter( typeof( Duct ) ) );
              a.Add( new ElementClassFilter( typeof( Pipe ) ) );

              FilteredElementCollector collector
            = new FilteredElementCollector( _doc )
              .WherePasses( new LogicalOrFilter( a ) );
        }