Back in the old days, it was easy to set any parameter value in macro. This was the code I was using in Revit 2014:

 

element.parameter("Any Parameter Name").set("value")

This was working for Build-in Parameters, Sheared Parameters and Project Parameters. When I migrated some macros to Revit 2017 this formula wasn’t working any more. After some search I found a solution. Unfortunately for every parameter type it’s different.

Build-in Parameters:

Build-in Parameters can be set by referencing to parameter Definition name.

in VB.Net

element.parameter(BuiltInParameter.DEFINITION_NAME).[set]("value")

in Python for Windows Comments parameter:

element.get_Parameter(BuiltInParameter.ALL_MODEL_INSTANCE_COMMENTS).Set("value")

Parameter Definition Name one can find using Revit Lookup or in API help.

Example in VB.Net from my amended macro for sheet parameters: Drawn By, Checked By and Sheet Issue Date:

m_vs.parameter(BuiltInParameter.SHEET_DRAWN_BY).[set](curSheet.sheetDrawn)
 m_vs.parameter(BuiltInParameter.SHEET_CHECKED_BY).[set](curSheet.sheetChecked)
m_vs.parameter(BuiltInParameter.SHEET_ISSUE_DATE).[Set](curSheet.sheetDate)

Shared Parameters:

Shared Parameters can be set by referencing their GUID number.

in VB.Net:

element.parameter(New Guid("guid-wierd-number").[set]("value")

in Python in Dynamo it DOESN’T WORK:

from System import Guid

NewGuid = Guid("7839a188-7b93-457a-9c33-0a4940183f18")
element.Parameter[NewGuid].Set("value")

Guid Number for Shared Parameters can be found in Shared Parameter file i.e

Code example in VB.Net from my amended macro:

 m_vs.parameter(New Guid("3c5aa4ef-99ff-4a51-abfe-7f7129b9fed4")).[Set](curSheet.documentType)

Project Parameters:

Project Parameters can be set by referencing in the formula parameter’s Definition by itself.

in VB.Net:

 Dim ParameterList As IList(Of Parameter)
 Parameterlist = element.GetParameters("Parameter Name")
 Dim Parameter As Parameter
 Parameter = ParameterList(0)
   element.parameter(Parameter.Definition).[set]("value")

in Python in Dynamo it DOESN’T WORK:

ParameterList = element.GetParameters("Parameter Name")
Parameter = ParameterList[0]
element.get_Parameter[Parameter.Definition].Set("value")

Is unsubscriptable  with get_Parameter or expects BuiltInParamter.

Any one knows how to make it work in Python in Dynamo?