CODEWITHSUNDEEP
revit-apirevitpythonshellpyrevit
Kyrre
Kyrre

Reputation: 85

Modify selection to first element by Selection.SetElementIds

I'm having trouble writing a script that lets med select the first element in my selection. This is useful for me because i select my correct Air Terminal from a schedule (where I can see the similar air-flow which I want to use) and use the command Create Similar from the selection. The trouble is that this command does not work when multiple elements are selected. Therefore, I want the first object from the list. This is the code which I'm trying:

from Autodesk.Revit.UI.Selection.Selection import SetElementIds
from System.Collections.Generic import List

uidoc = __revit__.ActiveUIDocument
doc = __revit__.ActiveUIDocument.Document
selection = [ doc.GetElement( elId ) for elId in __revit__.ActiveUIDocument.Selection.GetElementIds() ]
sel=[]
for i in selection:
    sel.append(i.Id)
uidoc.Selection.SetElementIds(List[ElementId](sel[0]))

That will return the following error message:

Exception : Microsoft.Scripting.ArgumentTypeException: expected int, got ElementId OK, then I'll try to replace

uidoc.Selection.SetElementIds(List[ElementId](sel[0]))

with

uidoc.Selection.SetElementIds(List[ElementId](sel[0].IntegerValue))

This seems to work, but selection is not modified

I am just starting to write RPS-scripts, but I'm hoping someone will show me what am I doing wrong here even if it is very obvious.

Thank you. Kyrre

EDIT: Thank you Jeremy, for solving this for me! The trick was to generate a List, not a python list. .Add method is what I did not get.

Final code if someone is interested:

from Autodesk.Revit.UI.Selection.Selection import SetElementIds
from System.Collections.Generic import List
from Autodesk.Revit.DB import ElementId
uidoc = __revit__.ActiveUIDocument
doc = __revit__.ActiveUIDocument.Document
selection = [ doc.GetElement( elId ) for elId in __revit__.ActiveUIDocument.Selection.GetElementIds() ]
sel=[]
for i in selection:
    sel.append(i.Id)
ids=List[ElementId](1)
ids.Add(sel[0]) 
uidoc.Selection.SetElementIds(ids)

Upvotes: 2

Views: 2976

Answers (1)

Jeremy Tammik
Jeremy Tammik

Reputation: 8294

SetElementIds takes a .NET ICollection<ElementId> argument, as you can see from the Revit API documentation.

Your statement calls the .NET List constructor that expects an integrer argument specifying the number N of elements to allovate space for: List[ElementId](N).

sel[0] is an ElementId, not an integer, which causes the first error.

sel[0].IntegerValue is a (very large and semi-arbitrary) integer number, so that causes no error. However, you are still leaving the List empty, unpopulated.

You should initialise the List for one single element and add that:

ids = List[ElementId](1)
ids.Add(sel[0])

Upvotes: 1

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