Upgrade the Notification Application to .NET 9.0

[Ahmed-Ghanam]

Description

With the release of .NET 9.0 under Microsoft’s Standard Term Support, this version may offer significant performance and functionality enhancements for the Notification application. Before proceeding with the upgrade, it is essential to analyze potential impacts, including any breaking changes in the existing codebase, to ensure a smooth transition.

Additional Information

.NET Core Support lifecycle
Container Patching

Tasks

• Upgrade SDKs, Tools, and Dependencies

  • Install the .NET 9.0 SDK and update development tools, including Visual Studio, CLI tools, and any build-related dependencies.
  • Review and update NuGet packages and third-party libraries to versions compatible with .NET 9.0.

• Update Target Framework

  • Modify project files to target .NET 9.0 and validate that all projects within the solution build successfully.

• Test Application Functionality

  • Run all automated tests, including unit, integration, and end-to-end tests, to verify application behavior.
  • Perform regression testing to ensure no critical functionality is broken by the upgrade.

• Optimize Performance and Refactor Code

  • Review and incorporate performance improvements available in .NET 9.0.
  • Identify and refactor any areas that benefit from .NET 9.0's new features or API enhancements.

• Update Build and Deployment Pipelines

  • Modify CI/CD pipeline configurations to use .NET 9.0 for builds, testing, and deployments.
  • If using Docker, update Dockerfiles to reference the .NET 9.0 base images and validate deployment compatibility.

• Documentation and Knowledge Sharing

  • Update technical documentation to reflect the .NET 9.0 upgrade, including dependency and framework version changes.

• Update any github workflows with .NET 9.0

• Check if we need to change anything in SonarCloud

Acceptance Criteria

• Build and Compatibility: The application builds successfully on .NET 9.0, with no compatibility errors across projects.
• Core Functionality: All core features perform as expected, with no functional regressions.
• Dependency Compatibility: All third-party libraries and dependencies are compatible with .NET 9.0.
• Performance Stability: Application performance is at least equal to, if not better than, the pre-upgrade version.
• Docker Integration: Docker images are updated to .NET 9.0, integrated into the CI/CD pipeline, and deployed successfully.
• Security Compliance: Dependencies and NuGet packages are updated to versions without known vulnerabilities.
• Testing Coverage: All automated tests pass, with no test failures or issues related to .NET 9.0.

Additional Information

No response

[Ahmed-Ghanam]

The release pipelines for this application utilize agents from the "altinn-vmss-platformagent" pool. The Platform team will update the base image used by these agents to the latest version