#region Namespaces

using System;

using System.Collections;

using System.Collections.Generic;

using System.Diagnostics;

using Autodesk.Revit.ApplicationServices;

using Autodesk.Revit.Attributes;

using Autodesk.Revit.DB;

using Autodesk.Revit.UI;

using Autodesk.Revit.UI.Selection;

#endregion

namespace DesignOptionReader

{

    [Autodesk.Revit.Attributes.Transaction(TransactionMode.Manual)]

    [Autodesk.Revit.Attributes.Regeneration(RegenerationOption.Manual)]

    [Autodesk.Revit.Attributes.Journaling(JournalingMode.NoCommandData)]

    public class Command : IExternalCommand

    {

        public Result Execute(

          ExternalCommandData commandData,

          ref string message,

          ElementSet elements)

        {

            try

            {

                Application application = commandData.Application.Application;

                ElementClassFilter filter = new ElementClassFilter(typeof(Autodesk.Revit.DB.DesignOption));

                FilteredElementCollector collector = new FilteredElementCollector(commandData.Application.ActiveUIDocument.Document);

                collector.WherePasses(filter);

                IEnumerator iter = collector.GetElementIdIterator();

                Element element;

                ElementSet designOptions = new ElementSet();

                while (iter.MoveNext())

                {

                    element = iter.Current as Element;

                    if (element.GetType().Equals(typeof(Autodesk.Revit.DB.DesignOption)))

                    {

                        designOptions.Insert(element);

                    }

                }

                if (designOptions.Size > 0)

                {

                    DesignOptionsDialog dialog = new DesignOptionsDialog();

                    foreach (Element elem in designOptions)

                    {

                        dialog.DesignOptionsList.Items.Add(elem.Name);

                    }

                    dialog.ShowDialog();

                }

                else

                {

                    TaskDialog.Show("DesignOptions","There are no design options in this document");

                }

            }

            catch (Exception ex)

            {

                message = ex.Message;

                return Result.Failed;

            }

            return Result.Succeeded;

        }

    }

}