What problem does it solve? Upgrading a project from .NET 10 to .NET 11 introduces dozens of source-breaking, behavioral, and binary-incompatible changes across the runtime, C# 15 compiler, ASP.NET Core, and EF Core 11. This Skill provides a systematic workflow to update the target framework, fix every build error, address silent behavioral changes, and update infrastructure so the migrated project builds cleanly and passes tests. ## Core Features & Use Cases - Guided Migration Workflow: Six-step process covering project assessment, TFM update, compilation fixes, behavioral changes, infrastructure updates, and verification. - Technology-Specific References: Detailed breaking change documents for C# 15 compiler, core libraries, SDK/MSBuild, ASP.NET Core, EF Core, cryptography, and runtime/JIT, loaded only when relevant to the project. - Use Case: You updated to the .NET 11 SDK and your solution now fails with SYSLIB0063 errors, EF Core Cosmos sync I/O exceptions, and Microsoft.OpenApi compile errors. This Skill walks through each failure with concrete fixes and updates your Dockerfiles and CI/CD pipelines to .NET 11. ## Quick Start Migrate the solution at ./src/MyApp.sln from .NET 10 to .NET 11 and fix all resulting build errors and behavioral changes.
