assets/samples/Samples/FabricationPartLayout/CS/FlipPart.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using Autodesk.Revit;
using Autodesk.Revit.DB;
using Autodesk.Revit.UI;
using Autodesk.Revit.DB.Fabrication;
using System.Windows.Forms;
using Autodesk.Revit.UI.Selection;

namespace Revit.SDK.Samples.FabricationPartLayout.CS
{
   /// <summary>
   /// Implements the Revit add-in interface IExternalCommand
   /// </summary>
   [Autodesk.Revit.Attributes.Transaction(Autodesk.Revit.Attributes.TransactionMode.Manual)]
   [Autodesk.Revit.Attributes.Regeneration(Autodesk.Revit.Attributes.RegenerationOption.Manual)]
   public class FlipPart : IExternalCommand
   {
      /// <summary>
      /// Implement this method as an external command for Revit.
      /// </summary>
      /// <param name="commandData">An object that is passed to the external application 
      /// which contains data related to the command, 
      /// such as the application object and active view.</param>
      /// <param name="message">A message that can be set by the external application 
      /// which will be displayed if a failure or cancellation is returned by 
      /// the external command.</param>
      /// <param name="elements">A set of elements to which the external application 
      /// can add elements that are to be highlighted in case of failure or cancellation.</param>
      /// <returns>Return the status of the external command. 
      /// A result of Succeeded means that the API external method functioned as expected. 
      /// Cancelled can be used to signify that the user cancelled the external operation 
      /// at some point. Failure should be returned if the application is unable to proceed with 
      /// the operation.</returns>
      public virtual Result Execute(ExternalCommandData commandData
          , ref string message, ElementSet elements)
      {
         try
         {
            // check user selection
            var uiDoc = commandData.Application.ActiveUIDocument;
            var doc = uiDoc.Document;

            Reference refObj = uiDoc.Selection.PickObject(ObjectType.Element, "Pick a fabrication part to flip.");
            var part = doc.GetElement(refObj) as FabricationPart;

            if (part == null)
            {
               message = "The selected element is not a fabrication part.";
               return Result.Failed;
            }

            if (part.CanFlipPart() == false)
            {
               message = "The selected fabrication part cannot be flipped";
               return Result.Failed;
            }

            using (var trans = new Transaction(doc, "flip part"))
            {
               trans.Start();

               part.Flip();

               trans.Commit();
            }

            return Result.Succeeded;
         }
         catch (Exception ex)
         {
            message = ex.Message;
            return Result.Failed;
         }
      }
   }
}