Creative Design & Branding
Migrate Dotnet8 To Dotnet9
Migrate a .NET 8 project to .NET 9 and resolve all breaking changes. USE FOR: upgrading TargetFramework from net8.0 to net9.0, fixing build errors after updating the .NET 9 SDK, resolving behavioral changes in .NET 9 / C# 13 / ASP.NET Core 9 / EF Core 9, replacing BinaryFormatter (now always throws), resolving SYSLIB0054-SYSLIB0057, adapting to params span overload resolution, fixing C# 13 compiler changes, updating HttpClientFactory for SocketsHttpHandler, and resolving EF Core 9 migration/Cosmos DB changes. DO NOT USE FOR: .NET Framework migrations, upgrading from .NET 7 or earlier, greenfield .NET 9 projects, or cosmetic modernization unrelated to the upgrade.
- Publisher / source
- dotnet/skills (found on skills.sh)
- Upstream record
- dotnet/skills
- Version
- Version 1
- Published
- Publication review
- Approved for publication · recorded passed scan 2026-11-01
- Content fingerprint
95d6de4776ccd6b8a71bf1ce776eb3cd8ddb67b590ce1ca66db4785a2d91d9a8