BuildingCoder.CmdSetTagType.Execute C# (CSharp) Method

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

              Autodesk.Revit.Creation.Application createApp
            = app.Application.Create;

              Autodesk.Revit.Creation.Document createDoc
            = doc.Create;

              // Determine the wall endpoints:

              double length = 5 * MeterToFeet;

              XYZ [] pts = new XYZ[2];

              pts[0] = XYZ.Zero;
              pts[1] = new XYZ( length, 0, 0 );

              // Determine the levels where
              // the wall will be located:

              Level levelBottom = null;
              Level levelTop = null;

              if( !GetBottomAndTopLevels( doc,
            ref levelBottom, ref levelTop ) )
              {
            message = "Unable to determine "
              + "wall bottom and top levels";

            return Result.Failed;
              }

              using ( Transaction t = new Transaction( doc ) )
              {
            t.Start( "Create Wall, Door and Tag" );

            // Create a wall:

            BuiltInParameter topLevelParam
              = BuiltInParameter.WALL_HEIGHT_TYPE;

            ElementId topLevelId = levelTop.Id;

            //Line line = createApp.NewLineBound( pts[0], pts[1] ); // 2013
            Line line = Line.CreateBound( pts[0], pts[1] ); // 2014

            //Wall wall = createDoc.NewWall( // 2012
            //  line, levelBottom, false );

            Wall wall = Wall.Create( // 2013
              doc, line, levelBottom.Id, false );

            Parameter param = wall.get_Parameter(
              topLevelParam );

            param.Set( topLevelId );

            // Determine wall thickness for tag
            // offset and profile growth:

            //double wallThickness = wall.WallType.CompoundStructure.Layers.get_Item( 0 ).Thickness; // 2011

            double wallThickness = wall.WallType.GetCompoundStructure().GetLayers()[0].Width; // 2012

            // Add door to wall;
            // note that the NewFamilyInstance method
            // does not automatically add a door tag,
            // like the UI command does:

            FamilySymbol doorSymbol = GetFirstFamilySymbol(
              doc, BuiltInCategory.OST_Doors );

            if ( null == doorSymbol )
            {
              message = "No door symbol found.";
              return Result.Failed;
            }

            XYZ midpoint = Util.Midpoint( pts[0], pts[1] );

            FamilyInstance door = createDoc
              .NewFamilyInstance(
            midpoint, doorSymbol, wall, levelBottom,
            StructuralType.NonStructural );

            // Create door tag:

            View view = doc.ActiveView;

            double tagOffset = 3 * wallThickness;

            midpoint += tagOffset * XYZ.BasisY;

            // 2011: TagOrientation.TAG_HORIZONTAL

            IndependentTag tag = createDoc.NewTag(
              view, door, false, TagMode.TM_ADDBY_CATEGORY,
              TagOrientation.Horizontal, midpoint ); // 2012

            // Create and assign new door tag type:

            FamilySymbol doorTagType
              = GetFirstFamilySymbol(
            doc, BuiltInCategory.OST_DoorTags );

            doorTagType = doorTagType.Duplicate(
              "New door tag type" ) as FamilySymbol;

            tag.ChangeTypeId( doorTagType.Id );

            // Demonstrate changing name of
            // family instance and family symbol:

            door.Name = door.Name + " modified";
            door.Symbol.Name = door.Symbol.Name + " modified";

            t.Commit();
              }

              return Result.Succeeded;
        }