Context Isolation in Revit 2026

[e_ziebarth]

Dear Revit community,

I am sorry if this is a stupid question but I was trying to use the new Add-in Dependency Isolation feature in Revit 2026 (referred to here: https://www.revitapidocs.com/2026/news). When I set these parameters nothing seems to change. Which further steps do I need to take in order to make it work?

[ricaun]

Unfortunately the Add-in Dependency Isolation does not work like I expected

I create a video when Revit 2026 release explain the issue.

I tested with Revit 2026.1 and still does not isolate my RevitAddin.B from RevitAddin.A.

Here is my full test project: https://github.com/ricaun-io/RevitTest.Isolation.Tests

 At the moment does not isolate the addin properly, other addin still can find similar dll in a in your isolated context...

I never gonna use this feature and I do not advise to used.

Ps: In Revit 2026.1 the RevitAddInUtility.dll was fixed.

[e_ziebarth]

Thanks a lot for providing this test project. What you show in your video is exactly the situation I run into.

It's unfortunate that the isolation doesn't work properly because that would solve a lot of problems. For now I fear I'll search for another solution. Thanks a lot.

[ricaun · Accepted solution]

I had some small hope that this would be fixed in Revit 2026.1 patch, didn't happen.

If you want to complain here is the main thread in the Revit Preview feedback.

• New Feature - Add-Ins Manager - Add-In Dependency Isolation (for Developers)

So I guess the easiest option to 'isolate' the plugin would be to ILRepack all the dependencies inside the main plugin dll.

I create a package to help ILRepack all the dependencies in a single dll. I kinda need to create a video about that.

Here is the package:

• https://github.com/ricaun-io/ricaun.ILRepack/

If you add this in your csproj, all the references will be repack inside the main dll. (Build time increases depending on how many dependencies your project has.)

<ItemGroup>
  <PackageReference Include="ricaun.ILRepack" Version="*">
    <PrivateAssets>all</PrivateAssets>
    <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
  </PackageReference>
</ItemGroup>

<PropertyGroup>
  <ILRepackCommandExtra>/allowdup /allowduplicateresources</ILRepackCommandExtra>
</PropertyGroup>

The other option would be implement the AssemblyLoadContext yourself, but that add code complexity and only works with .NET Core (Revit 2025+).