Upgrade to .NET 10 and C# 12

[Copilot]

Upgrade to .NET 10 and C# 12

Plan

Phase 1: Main Project Upgrades (src/)

• Upgrade WinPrint.Core (.csproj)
  • Update TargetFramework: netcoreapp3.1 → net10.0-windows
  • Update LangVersion: 8.0 → 12
  • Update NuGet packages to .NET 10 compatible versions
  • Fix System.Linq.Dynamic.Core vulnerability (1.4.5 → 1.7.1)
• Upgrade WinPrint.LiteHtml (.csproj)
  • Update TargetFramework: netcoreapp3.1 → net10.0-windows
  • Update NuGet packages to .NET 10 compatible versions
• Upgrade WinPrint.Console (.csproj)
  • Update TargetFramework: netcoreapp3.1 → net10.0-windows
  • Update NuGet packages (PowerShell SDK 7.0.0 → 7.4.0, analyzers)
  • Fix PostBuild event for cross-platform compatibility
• Upgrade WinPrint.WinForms (.csproj)
  • Update SDK: Microsoft.NET.Sdk.WindowsDesktop → Microsoft.NET.Sdk
  • Update TargetFramework: netcoreapp3.1 → net10.0-windows
  • Update NuGet packages
  • Fix PostBuild event for cross-platform compatibility

Phase 2: Test Project Upgrades (tests/)

• Upgrade WinPrint.Core.UnitTests (.csproj)
  • Update TargetFramework: netcoreapp3.1 → net10.0-windows
  • Update test framework packages (xunit 2.4.1 → 2.7.0, etc.)
  • Fix PostBuild event for cross-platform compatibility

Phase 3: Submodules

• Upgrade libvt100 (.csproj)
  • Update TargetFramework: netcoreapp3.1 → net10.0 and net10.0-windows (multi-target)
  • Update SDK: Microsoft.NET.Sdk.WindowsDesktop → Microsoft.NET.Sdk
  • Update LangVersion: 8.0 → 12
  • Update packages (System.Drawing.Common 4.7.0 → 8.0.0)
• Upgrade PowershellAsync (.csproj)
  • Update TargetFramework: netcoreapp3.1 → net10.0
  • Update packages (System.Management.Automation 7.0.0 → 7.4.0)

Phase 4: CI/CD Updates

• Update GitHub Actions workflow
  • Update dotnet-version: 3.1.101 → 10.0.x
  • Update actions/checkout: v2 → v4
  • Update actions/setup-dotnet: v1 → v4

Phase 5: Verification

• Build all projects successfully
• Run unit tests (all passing)
• Cross-platform build compatibility (added OS conditionals)
• Code review completed (no issues)
• Security scan completed (no vulnerabilities)

Phase 6: Documentation

• Create UPGRADE_NOTES.md documenting all changes

Summary of Changes

• Target Framework: netcoreapp3.1 → net10.0-windows for all Windows-specific projects
• C# Language Version: 8.0 → 12 (where specified)
• Major Package Updates:
  • System.Linq.Dynamic.Core: 1.1.0 → 1.7.1 (fixes security vulnerability)
  • PowerShell SDK: 7.0.0 → 7.4.0
  • Serilog: 2.9.1 → 4.0.0
  • xUnit: 2.4.1 → 2.7.0
  • Many other packages updated to .NET 10 compatible versions
• Build System: Added OS conditionals to PostBuild events for cross-platform CI compatibility
• Security: Resolved vulnerability in System.Linq.Dynamic.Core

Note: Submodule changes (libvt100 and PowershellAsync) are documented in UPGRADE_NOTES.md. These changes should be committed to their respective repositories.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Upgrade to latest dotnet and c#</issue_title>
<issue_description>For each project / component create a plan for upgrading to dotnet 10 and c#12.

important Do the work in the v2.1 branch.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Upgrade to latest dotnet and c# #49

---

💡 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.

[tig]

@copilot dotnet 10 absolutely exists.

[Copilot]

@copilot dotnet 10 absolutely exists.

Yes, confirmed! The final implementation correctly uses .NET 10 (net10.0-windows) and C# 12 for all projects. All builds and tests are passing with .NET 10.0.x SDK.