[Trimming] MVC

[JamesNK]

Is there an existing issue for this?

• [X] I have searched the existing issues

Is your feature request related to a problem? Please describe the problem.

MVC should run in a trimmed app.

Note that trimming and MVC might not be compatible. In that case, projects should be correctly annotated. e.g. MapControllers has a [RequiresUnreferencedCode] attribute on it and linker warnings are suppressed.

Describe the solution you'd like

Shipping projects under https://github.com/dotnet/aspnetcore/tree/main/src/Mvc need to add support for trimming.

See https://github.com/dotnet/aspnetcore/blob/main/docs/Trimming.md for instructions

Known issues to resolve:

• [ ] Application parts attribute can reference assemblies that are trimmed. Ways to resolve:
  • Ignore missing assembly (not ideal. Perhaps more workable if there is a way to detect at runtime whether an app is trimmed and only do it then.)
  • Run the MSBuild task that adds part attributes after linker is run. If the linker has removed an assembly then don't include the attribute. Not sure if this is possible. May need to ask the linker/trimming team for advice here.

Tasks:

• [ ] Resolve linker warnings
• [ ] Integration test of calling MVC app published with trimming. Basic smoke test.

Additional context

No response

[ghost]

Thanks for contacting us.

We're moving this issue to the .NET 7 Planning milestone for future evaluation / consideration. We would like to keep this around to collect more feedback, which can help us with prioritizing this work. We will re-evaluate this issue, during our next planning meeting(s). If we later determine, that the issue has no community involvement, or it's very rare and low-impact issue, we will close it - so that the team can focus on more important and high impact issues. To learn more about what to expect next and how this issue will be handled you can read more about our triage process here.