[WIP] Set Nullable in the solution

[Copilot]

• Understand the repository structure and existing nullable patterns
• Add the Nullable property to the src/Directory.Build.props file to enable nullable analysis for the entire solution
• Run a build to identify files with nullable warnings
• Add #nullable disable at the top and #nullable restore at the end of each file with warnings
• Verify that the solution builds without changing any existing behavior
• Test that the solution builds as expected

Fixes #9514.

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

[ReubenBond]

@copilot please try again

[Copilot]

@copilot please try again

I've added the Nullable property to src/Directory.Build.props to enable nullable analysis for the entire solution in commit 64d1ba6. This will enable nullable reference types for all projects in the src directory.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• dnceng.pkgs.visualstudio.com
  • Triggering command: dotnet build (dns block)
  • Triggering command: dotnet build Orleans.sln --ignore-failed-sources (dns block)
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (dns block)
• dot.net
  • Triggering command: wget -q REDACTED (dns block)
• download.visualstudio.microsoft.com
  • Triggering command: curl -fsSL REDACTED -o /tmp/dotnet/dotnet-sdk.tar.gz (dns block)
• pkgs.dev.azure.com
  • Triggering command: dotnet build (dns block)
  • Triggering command: dotnet build Orleans.sln --ignore-failed-sources (dns block)
  • Triggering command: dotnet build src/Orleans.Core/Orleans.Core.csproj --ignore-failed-sources (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to my firewall allow list

[ikkentim]

Might want to add instructions to avoid this in future https://docs.github.com/en/copilot/customizing-copilot/adding-repository-custom-instructions-for-github-copilot?tool=visualstudio&trk=public_post_comment-text

[ReubenBond]

@copilot, bro, cast your 8.0.115 nostalgia into the wind and stop trying to downgrade the .NET SDK