Storing and retrieving ID of feature line inside corridor

[davidm_adn]

I need to let the user pick a feature line which is part of a corridor, attach an object to it, and store which feature line was picked on that object.  Typically this would be a handle of the feature line, or some other unique identifier.

I can get the feature line closest to the pick point no problem, by getting all the feature lines out of the corridor, getting their geometry and running a 'closest to' kind of process.  Maybe there is a smarter way to do that but this works for now.

But, I can't see anything on the feature line which can tell me which one it is in the corridor.

• The feature lines seem to have names, but I think more than one feature line in a corridor can have the same name.
• I can't store that it was the nth feature line in the corridor, in case other feature lines are added or removed from the corridor.
• I can't use the pick point, in case the corridor changes such that a different feature line is now closest to the pick point.

Does anyone know anything about doing this?  I am happy to use .NET or COM to achieve it.

Thanks for any help.

[augusto.goncalves]

I can only see the CorridorFeatureLine.CorridorId property.

[davidm_adn]

Thank you, yes I saw that one too, but it's the ID of the parent corridor, not an identifier of the feature line itself.

[joantopo]

What's a pity!!!

In fact, I was thinking in doing this idea with C3D API:

https://forums.autodesk.com/t5/autocad-civil-3d-ideas/replace-featureline-to-another-one-as-targets-...