Migrate Dotnet9 To Dotnet10

Migrate a .NET 9 project or solution to .NET 10 and resolve all breaking changes. USE FOR: upgrading TargetFramework from net9.0 to net10.0, fixing build errors after updating the .NET 10 SDK, resolving source and behavioral changes in .NET 10 / C# 14 / ASP.NET Core 10 / EF Core 10, updating Dockerfiles for Debian-to-Ubuntu base images, resolving obsoletion warnings (SYSLIB0058-SYSLIB0062), adapting to SDK/NuGet changes (NU1510, PrunePackageReference), migrating System.Linq.Async to built-in AsyncEnumerable, fixing OpenApi v2 API changes, cryptography renames, and C# 14 compiler changes (field keyword, extension keyword, span overloads). DO NOT USE FOR: .NET Framework migrations, upgrading from .NET 8 or earlier (use migrate-dotnet8-to-dotnet9 first), greenfield .NET 10 projects, or cosmetic modernization. LOADS REFERENCES: csharp-compiler, core-libraries, sdk-msbuild (always); aspnet-core, efcore, cryptography, extensions-hosting, serialization-networking, winforms-wpf, containers-interop (selective).

mkdir -p ~/.claude/skills/migrate-dotnet9-to-dotnet10
curl -L https://claudskills.com/skills/migrate-dotnet9-to-dotnet10/SKILL.md \
  -o ~/.claude/skills/migrate-dotnet9-to-dotnet10/SKILL.md

@misc{migrate-dotnet9-to-dotnet10-2026,
  author    = {ClaudSkills},
  title     = {Migrate Dotnet9 To Dotnet10 [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/migrate-dotnet9-to-dotnet10/}
}