ElementSetParameterByName: ''The parameter is read-only''

[gregoriosaura]

Hi all,

I've got a little problem with the code: ElementSetParameterByName

I can modify the parameter "h_triangle" in the revit file manualy, but in the meantime, Dynamo tells me that is an only-read parameter.

Do you know why is it hapenning?

(you have the print-screen from dynamo and the revit and dynamos  files in attached.

Thanks in advance!

[L.Maas]

If you look at your project then you see this for the triangle family

You see that the parameter h_triangle is grayed out in the properties window, meaning that you can not modify it. Thus it has nothing to do with Dynamo.

As a standard rule you could say, if you can not do it in the Revit GUI you can not do it with code.

[gregoriosaura · Accepted solution]

Thanks Louis!, Indeed, I just tried to do the same thing not in a *.rvt file, but in a *.rfa file, and it did work! In a *.rvt file, you can modify the parameter only if you are into the modification dialogue of the conceptual mass family. So , the script worked!

Kind regards

Greg

[Anonymous]

Привет
я столкнулся с той же проблемой. Как вам удалось изменить параметр экземпляра ?