Combine phases without loss

[Anonymous]

Hi,

I'm trying to combine phases without loss because if you combine two phases in Revit you will lost your two bases phases.

The main idea of my tool :

1/ Duplicate the two phases

2/ Combine phases

3/ Rename new phase

What i have so far :

/// <summary>
    /// Permet de fusionner deux phases en une nouvelle phase
    /// </summary>
    [Transaction(TransactionMode.Manual)]
    public class ActionMergePhase : IExternalCommand
    {
        public Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements)
        {
            ApplicationInformations app = new ApplicationInformations(commandData); // centralized stuff like document, activeView, 

            // Dupliquer une phase ?
            using (TransactionPetit transaction = new TransactionPetit(app.Document, "Copy Phase", true, false)) // Custom transaction (supressWarning and/or error)
            {
                transaction.Start();
                try
                {
                    if(app.Phases.Size == 0)
                    {
                        throw new Exception();
                    }

                    // Prendre "Phase 1"
                    Phase phase1 = app.Phases.get_Item(1); // I have at least 3 phases in my project, so i can do that
                    if (null == phase1) // just in case
                    {
                        throw new NullReferenceException();
                    }

                    var id = ElementTransformUtils.CopyElement(app.Document, phase1.Id, XYZ.Zero);
                    Phase copyPhase = app.Document.GetElement(id.First()) as Phase;
                    copyPhase.Name = "myAwesomePhaseName"; // rename ?

                    transaction.Commit();
                }
                catch (Exception e)
                {
                    transaction.RollBack();
                    TaskDialog.Show("Error", e.Message);
                    return Result.Failed;
                }
            }

            // Then merge ?
            // TODO


            return Result.Succeeded;
        }
    }

Unfortunately, i have un pop up message with "Project's phase can't be copy"...

So, two questions :

- Does anyone ever tried to copy phase ?

- How could I combine two phases with Revit API ? (i'm using 2015 version)

Regards 

AJ

P.S. : sorry for french comment