BuildingCoder.CmdCollectorPerformance.GetOpeningsInWall C# (CSharp) Method

        void GetOpeningsInWall(
            Document doc,
            Wall wall)
        {
            ElementId id = wall.Id;

              BuiltInCategory bic
            = BuiltInCategory.OST_SWallRectOpening;

              FilteredElementCollector collector
            = new FilteredElementCollector( doc );

              collector.OfClass( typeof( Opening ) );
              collector.OfCategory( bic );

              // explicit iteration and manual
              // checking of a property:

              List<Element> openings = new List<Element>();

              foreach( Opening e in collector )
              {
            if( e.Host.Id.Equals( id ) )
            {
              openings.Add( e );
            }
              }

              // using LINQ:

              IEnumerable<Opening> openingsOnLevelLinq =
            from e in collector.Cast<Opening>()
            where e.Host.LevelId.Equals( id )
            select e;

              // using an anonymous method:

              IEnumerable<Opening> openingsOnLevelAnon =
            collector.Cast<Opening>().Where<Opening>( e
              => e.Host.Id.Equals( id ) );
        }