Support .NET SDK 10

[Arash-Sabet]

Plan and Actions:

To fully upgrade to .NET SDK 10 (dropping backward compatibility):

1. Update all .csproj files to target net10.0 only
   • Remove any references to previous TargetFrameworks/TFMs (net8.0, net6.0, etc.)
   • Ensure all projects and test projects target ONLY net10.0
   • Increment the version number to 10.0.0 in Xunit.Microsoft.DependencyInjection.csproj found in here: <Version Condition="'$(Version)' == ''">9.2.2</Version>
2. Upgrade NuGet package dependencies
   • Use dotnet list package --outdated to identify packages requiring updates
   • Upgrade each package to the latest compatible version for .NET 10 using NuGet
   • Fix code as needed for any breaking changes introduced by new dependencies
   • Validate all code builds and runs with updated dependencies
3. Update build pipelines (GitHub Actions if any)
   • Modify workflow files to use actions/setup-dotnet with SDK 10 (10.x)
   • Remove matrix entries for older SDK versions
   • Validate pipeline, both PR and release, builds and tests with SDK 10 only
   • The build pipelines are the following yml files only:
     • azure-pipeline-PR.yml
     • azure-pipelines.yml - Increment the major number to 10, minor and revision to both 0 in this yml file
4. Run and fix all tests
   • Ensure the entire test suite passes on net10.0
   • Address any failures due to upgraded dependencies or SDK changes
5. Documentation and release
   • Update README, changelog, and documentation to specify .NET 10 minimum requirement
   • Set appropriate version bump (major if public APIs or support dropped)
   • Do not publish to NuGet as it will be a manual process

Deliverables:

• Branch: support/net10 with all changes
• PR: "Support .NET SDK 10 (net10.0 only, no backward compatibility)"
• Changelog entries, CI status, publishing info
• Do not run azure-pipelines.yml as that will be a manual process. Run azure-pipeline-PR.yml only to validate.

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Decision:

• Targeting net10.0 only. All compatibility with previous .NET SDKs is removed.
• No multi-targeting; this is a breaking change for consumers relying on older SDKs.

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Next steps:

• Execute the above in sequence and open a PR for review once ready.

Draft for your approval before implementation.

[github-actions]

The GitHub issue requests support for the upcoming .NET SDK 10. It specifies that necessary changes should be implemented once the SDK progresses beyond all release candidate (rc-x) versions and reaches a stable release.