/// <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 canceled the external operation
/// at some point. Failure should be returned if the application is unable to proceed with
/// the operation.</returns>
public Autodesk.Revit.UI.Result Execute(Autodesk.Revit.UI.ExternalCommandData commandData,
ref string message, Autodesk.Revit.DB.ElementSet elements)
{
Transaction newTran = null;
try
{
UIDocument uiDoc = commandData.Application.ActiveUIDocument;
if (null == uiDoc)
{
message = "this command needs to be run in an active document.";
return(Result.Failed);
}
Document doc = uiDoc.Document;
ICollection <ElementId> selectedId = uiDoc.Selection.GetElementIds();
if (1 != selectedId.Count)
{
message = "Please select a stairs element before running this command.";
return(Result.Failed);
}
Stairs stairsElem = doc.GetElement(selectedId.ElementAt(0)) as Stairs;
if (null == stairsElem)
{
message = "Please select a stairs element before running this command.";
return(Result.Failed);
}
if (stairsElem.MultistoryStairsId != ElementId.InvalidElementId)
{
TaskDialog.Show("Warning", "The selected stairs is in a multistory stairs already.");
return(Result.Succeeded);
}
// create a multistory stairs by input a stair element.
newTran = new Transaction(doc, "Create Multistory Stairs");
newTran.Start();
MultistoryStairs.Create(stairsElem);
newTran.Commit();
return(Autodesk.Revit.UI.Result.Succeeded);
}
catch (Exception e)
{
message = e.Message;
if ((newTran != null) && newTran.HasStarted() && !newTran.HasEnded())
{
newTran.RollBack();
}
return(Autodesk.Revit.UI.Result.Failed);
}
}
