Cannot replace nulls on Values read from Revit Element

[lignindes]

Hello,

I’m trying to read Mark values from a Revit file and write the value to a Rhino Key:Value pair (using Elefront).

Not all the Revit Elements that I’m reading have a Mark assigned so my list is coming up with s.

It’s looking like these aren’t good old fashioned nulls but a nasty cousin.

Am I not able to use Replace Nulls because these are autodesk.spec.strings? I tried a few other work arounds (Replace Text, Replace Members, etc.) but none seem to work.

Any ideas how this could be resolved?

Dan

[eirannejad (Ehsan Iran-Nejad)]

Right-click on the output parameter and actiavte Cull Nulls

[lignindes]

@eirannejad

Ah! Interesting. Cull Nulls is available by right clicking on the output of several other components, but not the Get Element Parameter node. Also, I would prefer to keep the tree structure and so my first choice would be to Replace Nulls.

Do I need to go back to the Revit file and enter in a dummy value (non-null) in the Mark field for all Elements in this list?

Dan

[Rickson]

Here are a couple solutions. i typically use the list length to create actual nulls, which should work in this case.

Remove empty items from lists

These critters are as pesky as Nulls, there should be specific commands to get rid of them or to replace them by a some value, or maybe adding this as an option to “Null item” and “Replace Nulls”, like what is done with “Clean Tree”. I know about using textlenght as a hack to do this, but it is just that : a hack.

Remove Empty not removing

[image] Any ideas why it is not working?

[lignindes]

@Rickson @eirannejad

Thanks! I looked through those topics and modified a short expression that did the trick.

Dan