"A managed exception was thrown by Revit or by one of its external applications." message when editing family parameters via Python

Revit
1

So my goal is to uncheck the “Show pre-cut family in plan views” box in Family Parameters for all Structural Columns automatically.

So far, I could not do it with Dynamo since it is kind an unusual parameter. Here is what I managed to get with Python

Screenshot_2
Screenshot_2.jpg826×695 91.5 KB

And here is the message I see every time running the script. It seems like it works with few columns and then stops at that exception
“Exception : Autodesk.Revit.Exceptions.InternalException: A managed exception was thrown by Revit or by one of its external applications.
в Autodesk.Revit.DB.FilteredElementIterator.MoveNext()”
What might be the problem?

2

You’re iterating through the families in the project and at the same time making changes to those families. That invalidates the information in the iterator and breaks things down…

3

Thank you for clarification! I solved the problem by adding fec=list(fec)

4

Denis,

could you please post the final solution. I am currently trying to do the same thing. I am not sure where it goes in the script.

I was trying to solve this solution via Dynamo nodes without python but am getting errors with the Orchid Package @erfajo

Orchid%20Set%20Built%20In%20Parameter
Orchid Set Built In Parameter.jpg1442×867 322 KB

thanks.

5

Hi!

Below is the full code. I run it in Python Shell ( https://github.com/architecture-building-systems/revitpythonshell](https://protect-eu.mimecast.com/s/F2hYCwpE8UR3gqIqPTYV?domain=github.com ), because Dynamo was not able to change Revit Families

import clr

clr.AddReference(‘RevitAPI’)
from Autodesk.Revit.DB import *

clr.AddReference(‘RevitAPIUI’)
from Autodesk.Revit.UI import *

app = revit.Application
uidoc = revit.ActiveUIDocument
doc = revit.ActiveUIDocument.Document

class FamilyOption(IFamilyLoadOptions):
def OnFamilyFound(self,familyInUse,overwriteParameterValues):
return True

def OnSharedFamilyFound(self, sharedFamily, familyInUse, FamilySource, overwriteParameterValues):
return True

#Preparing input from dynamo to revit
fec = FilteredElementCollector(doc).OfClass(Family)
fec = list(fec)
for f1 in fec:
if f1.FamilyCategory.Name == ‘Structural Columns’:
print f1.Name
f = f1
o = 0

famdoc = doc.EditFamily(f)

thisFamily = famdoc.OwnerFamily
parPrecut = thisFamily.get_Parameter(BuiltInParameter.FAMILY_USE_PRECUT_SHAPE)

t = Transaction(famdoc)
t.Start(“Edit o”)
parPrecut.Set(o)
t.Commit()

print famdoc.LoadFamily(doc, FamilyOption())

print famdoc.Close(False)

1 Like