topic Load Revit plugin on Legacy Revit versions in Revit API Forum

Load Revit plugin on Legacy Revit versions

mizrachi_amir2 — Sun, 14 Apr 2024 10:40:16 GMT

Hello All,

I have a Revit plugin with 2 commands that are intended to run on Revit 2019 onward.

I am now working on the 3rd command, which is using the OST_Signage BuiltInCategory. This category is only available from Revit 2022 API.

How can I still load this whole plugin (with 3 commands) also to Revit 2019 so that the 3rd command will not be functional?

Thank you!

Re: Load Revit plugin on Legacy Revit versions

mizrachi_amir2 — Sun, 14 Apr 2024 13:28:00 GMT

So - whoever tackles the same, I managed to overcome this using the preprocessor directives:

#if --> #else --> #endif

Also added this to my .csproj:

<DefineConstants>$(DefineConstants);RV$(RevitVersion)</DefineConstants>

This is what guided me:

https://levelup.gitconnected.com/multi-year-revit-addin-a-better-way-54ef441b5b4b

Re: Load Revit plugin on Legacy Revit versions

nice3point — Sun, 14 Apr 2024 21:01:31 GMT

The approach in the article above suggests creating one project, per Revit version. This is bad advice, and I don't recommend it. With Define Constants, you can support all versions of the Revit API in a single project

Recommendations:

Revit Multiversion support wiki - https://github.com/Nice3point/RevitTemplates/wiki/Multiple-Revit-Versions

Auto Define constants generation - https://github.com/Nice3point/Revit.Build.Tasks

Re: Load Revit plugin on Legacy Revit versions

mizrachi_amir2 — Sun, 14 Apr 2024 15:29:39 GMT

Thank you, @nice3point.

Actually, I used your templates so I have a single project for all versions 🙂

Re: Load Revit plugin on Legacy Revit versions

nice3point — Sun, 14 Apr 2024 20:59:27 GMT

perfect) then I have good news for you, you don't need to add DefineConstants yourself. They are already contained in the templates

In your case, the only thing left to do is to wrap the code in a #if block:

#if REVIT2022_OR_GREATER var category = BuiltInCategory.OST_Signage; #endif

Re: Load Revit plugin on Legacy Revit versions

mizrachi_amir2 — Mon, 15 Apr 2024 20:25:26 GMT

That is just great. Thank you very much!