BuildingCoder.CmdChangeFloorSlope.Execute C# (CSharp) Метод

        public Result Execute(
            ExternalCommandData revit,
            ref string message,
            ElementSet elements)
        {
            UIApplication uiapp = revit.Application;
              UIDocument uidoc = uiapp.ActiveUIDocument;
              Document doc = uidoc.Document;
              Selection sel = uidoc.Selection;

              Reference ref1 = sel.PickObject(
            ObjectType.Element, "Please pick a floor." );

              Floor f = doc.GetElement( ref1 ) as Floor;

              if( f == null )
            return Result.Failed;

              // Retrieve floor edge model line elements.

              ICollection<ElementId> deleted_ids;

              using( Transaction tx = new Transaction( doc ) )
              {
            tx.Start( "Temporarily Delete Floor" );

            deleted_ids = doc.Delete( f.Id );

            tx.RollBack();
              }

              // Grab the first floor edge model line.

              ModelLine ml = null;

              foreach( ElementId id in deleted_ids )
              {
            ml = doc.GetElement( id ) as ModelLine;

            if( null != ml )
            {
              break;
            }
              }

              if( null != ml )
              {
            using( Transaction tx = new Transaction( doc ) )
            {
              tx.Start( "Change Slope Angle" );

              // This parameter is read only. Therefore,
              // the change does not work and we cannot
              // change the floor slope angle after the
              // floor is created.

              ml.get_Parameter(
            BuiltInParameter.CURVE_IS_SLOPE_DEFINING )
              .Set( 1 );

              ml.get_Parameter(
            BuiltInParameter.ROOF_SLOPE )
              .Set( 1.2 );

              tx.Commit();
            }
              }
              return Result.Succeeded;
        }