GlobalParameter SetValue in Python

Developers
1

Hi,

I am trying to set a global parameter value using python but it doesn’t work. While I am able to GetValue() or GetType I still cant assign new value.

import clr
# Import RevitAPI
clr.AddReference("RevitAPI")
import Autodesk
from Autodesk.Revit.DB import ReferencePointArray
# Import DocumentManager
clr.AddReference("RevitServices")
import RevitServices
from RevitServices.Persistence import DocumentManager

# Import ToDSType(bool) extension method
clr.AddReference("RevitNodes")
import Revit
clr.ImportExtensions(Revit.Elements)

doc= DocumentManager.Instance.CurrentDBDocument

dataEnteringNode = IN

#Assign your output to the OUT variable.
j = IN[0]
h = UnwrapElement(j)
D = h.GetValue().Value
m = h.GetType()
q= h.GetOrderedParameters()

h.SetValue(10.0)


OUT = D

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2

Looks like your parameters types might not match. What kind of value is it expecting? What do you get back with GetValue?

3

To set the parameter value you need to construct a ParameterValue as seen in the API docs for the SetValue() method

Here is the constructor for a DoubleParameterValue and you can determine what ParameterValue class you need to construct by using .GetType() after .GetValue()

Additionally, you’ll need to start and close a transaction to change the parameter value.

Something like this should work:

TransactionManager.Instance.EnsureInTransaction(doc)

hValue = Autodesk.Revit.DB.DoubleParameterValue(10.0)
h.SetValue(hValue)
newVal = h.GetValue().Value

TransactionManager.Instance.TransactionTaskDone()

OUT = newVal

Make sure to import the transaction manager as well

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