Retrieve level from element

[MuirEng]

confused by this one. 
I have elements in a model (mechanical devices). I can set up a schedule including "Level" and the level comes up fine.
In Dynamo I set up a script that gets (by category) all mechanical devices, and this feeds into GetParameterValueByName with "Level" as the input to the parameter name. This properly returns a list of levels. 

All good so far.

But in C# this code returns "Unknown" :

   Parameter levelParam = element.LookupParameter("Level");
   string levelName = levelParam != null ? levelParam.AsString() : "Unknown";

I've written some code to display all the parameters of the element along with the value and Level is listed, with the proper value. 

Why should this work so easily in Dynamo but not in C#?

Thanks for your advice. 

[MuirEng]

this also does not work

BuiltInParameter paraIndex = BuiltInParameter.LEVEL_PARAM;
Parameter levelParam = element.get_Parameter(paraIndex);
string levelName = levelParam != null ? levelParam.AsString() : "Unknown";

btw, is anyone else seeing constant pop ups asking for sign in? I'm logged in to my AutoDesk account. It's really annoying. Things freeze until I hit cancel. 

[studio-a-int]

If you try to get_Parameter(BuiltInParameter.SCHEDULE_LEVEL_PARAM).AsElementId() for those families, do still get a null?

[jeremy_tammik]

What StorageType does LEVEL_PARAM have? Is it really a string? I would expect a level to be identified by its element id, not a string.

[TripleM-Dev.net]

Hi @MuirEng ,

In Revit where the level "hides" is different between categories, even family types (facebased, levelbased etc) and between how elements are hosted (workplane a floor or level) and even between Revit versions.

The Dynamo node will propably have a extensive code behind it checking for the family placement type and some categories and using certain builtinparameters based on those (and more) conditions.

I've tried to built a global util that can read the level from any element but doesn't always come up with the correct Level if any.

Some parameters return a ElementId as host (which can be a level) but some only return a text value, with the prefix "Level : " (also depending revit version)

Use RevitLookup to inspect which parameters read out the level, specially if you are only concerned about one family category. If lucky the LevelId property of element will do it, else there are several parameters like:

- SCHEDULE_LEVEL_PARAM

- FAMILY_LEVEL_PARAM

- INSTANCE_FREE_HOST_PARAM

- HOST_ID_PARAM

- Etc...

- Michel

[GaryOrrMBI]

I have a post asking about that same login pop-up posted on 10/2/2024...
It doesn't have any help or solution, just sayin...

-G