I want to obtain the type parameter “layers” for all my walls. I want this parameter to get the following value: “1.Material1 (thickness); 2.Material2 (thickness);…” and so on up to the last material. so that I can obtain a nice schedule with all wall materials. how to do it in Dynamo?There was a topis some time ago but nobody solved it.
Yes yes yes - it works. Only problem is, it gives me a watch list for only one wall type, while I want to assign this parameter for all wall types
Earlier you said you wanted a list for a schedule? Now you want to assign a parameter?
If this is what you need but for every wall or wall type in your project then i need you to do some work and give it a good shot, the fundamentals are here for you to work from.
yeah i would try create a multiline parameter as i guees it meant to a single parameter…but not sure 
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It worked! But just for one wall so I have to manually set all my walls in the project. Is there a way to do it for all wall types automatically? Here is screen from what I did:
@remigiuszCNFU2 You should now have all the pieces of the puzzle.
You will need to toy with Lists and Lacing to finish this off.
Take a look at the https://primer.dynamobim.org/
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ALMOST 
I’ve gone here. I have an array of wall types in the Watch list 1 (see screen) and the array of wall layers in the watch list 2. - all I want is to assign the parameter P3.Warstwy for wall type N (from the list 1) an array number N from the list 2. It should work with the Element.SetParameterByName string - but it doesn’t
And it works for a single wall. Where is the mistake?
Levels or lacing on the set parameter node
it worked! it was enough to use List.Flatten - although I got no idea what it means, just a random string :)))
Thanks for all replies!
BTW. It shows me such warning, although the script works well, do u know what it means and how to clean it up?
Likely that of your walls has a ‘by category’ layer in the assembly.
Does a material have a Description parameter?
It does and the script properly takes the description parameter from the material. As I mentioned, script works well, only this warning shows up, but even though the script works.
Put a watch node in between the erroring node and the ‘materials’ output of the prior node. One of the items will likely read ‘null’.