BuildingCoder.CmdCollectorPerformance.GetInstancesIntersectingElement C# (CSharp) Method

        void GetInstancesIntersectingElement( Element e )
        {
            #region Joe's code
            #if JOE_CODE
            // Find intersections between family instances and a selected element

            Reference Reference = uidoc.Selection.PickObject(
            ObjectType.Element, "Select element that will "
            + "be checked for intersection with all family "
            + "instances" );

            Element e = doc.GetElement( reference );

            GeometryElement geomElement = e.get_Geometry(
            new Options() );

            Solid solid = null;
            foreach( GeometryObject geomObj in geomElement )
            {
            solid = geomObj as Solid;
            if( solid = !null ) break;
            }

            FilteredElementCollector collector
            = new FilteredElementCollector( doc )
              .OfClass( typeof( FamilyInstance ) )
              .WherePasses( new ElementIntersectsSolidFilter(
            solid ) );

            TaskDialog.Show( "Revit", collector.Count() +
            "Family instances intersect with selected element ("
            + element.Category.Name + "ID:" + element.Id + ")" );
            #endif // JOE_CODE
              #endregion // Joe's code

              // Test this in these SDK sample models:
              // C:\a\lib\revit\2015\SDK\Samples\FindReferencesByDirection\FindColumns\FindColumns-Basic.rvt
              // C:\a\lib\revit\2015\SDK\Samples\FindReferencesByDirection\FindColumns\FindColumns-TestCases.rvt

              Document doc = e.Document;

              Solid solid = e.get_Geometry( new Options() )
            .OfType<Solid>()
            .Where<Solid>( s => null != s && !s.Edges.IsEmpty )
            .FirstOrDefault();

              FilteredElementCollector intersectingInstances
            = new FilteredElementCollector( doc )
              .OfClass( typeof( FamilyInstance ) )
              .WherePasses( new ElementIntersectsSolidFilter(
            solid ) );

              int n1 = intersectingInstances.Count<Element>();

              intersectingInstances
            = new FilteredElementCollector( doc )
              .OfClass( typeof( FamilyInstance ) )
              .WherePasses( new ElementIntersectsElementFilter(
            e ) );

              int n = intersectingInstances.Count<Element>();

              Debug.Assert( n.Equals( n1 ),
            "expected solid intersection to equal element intersection" );

              string result = string.Format(
            "{0} family instance{1} intersect{2} the "
            + "selected element {3}{4}",
            n, Util.PluralSuffix( n ),
            ( 1 == n ? "s" : "" ),
            Util.ElementDescription( e ),
            Util.DotOrColon( n ) );

              string id_list = 0 == n
            ? string.Empty
            : string.Join( ", ",
            intersectingInstances
              .Select<Element, string>(
                x => x.Id.IntegerValue.ToString() ) )
              + ".";

              Util.InfoMsg2( result, id_list );
        }