BuildingCoder.CmdWallNeighbours.Execute C# (CSharp) Метод

        public Result Execute(
            ExternalCommandData commandData,
            ref string message,
            ElementSet elements)
        {
            UIApplication app = commandData.Application;
              UIDocument uidoc = app.ActiveUIDocument;
              Document doc = app.ActiveUIDocument.Document;

              List<Element> walls = new List<Element>();
              if( !Util.GetSelectedElementsOrAll(
            walls, uidoc, typeof( Wall ) ) )
              {
            Selection sel = uidoc.Selection;
            message = ( 0 < sel.GetElementIds().Count )
              ? "Please select some wall elements."
              : "No wall elements found.";
            return Result.Failed;
              }

              int i, n;
              string desc, s = null;
              //List<Element> neighbours;
              ElementArray neighbours;

              foreach( Wall wall in walls )
              {
            desc = Util.ElementDescription( wall );

            LocationCurve c
              = wall.Location as LocationCurve;

            if( null == c )
            {
              s = desc + ": No wall curve found.";
            }
            else
            {
              s = string.Empty;

              for( i = 0; i < 2; ++i )
              {
            neighbours = c.get_ElementsAtJoin( i );
            n = neighbours.Size;

            s += string.Format(
              "\n\n{0} {1} point has {2} neighbour{3}{4}",
              desc,
              (0 == i ? "start" : "end"),
              n,
              Util.PluralSuffix( n ),
              Util.DotOrColon( n ) );

            foreach( Wall nb in neighbours )
            {
              s += "\n  " +
                Util.ElementDescription( nb );
            }
              }
            }
            Util.InfoMsg( s );
              }
              return Result.Failed;
        }