dotnet-multi-targeting
dotnet-multi-targeting
Comprehensive guide for .NET multi-targeting strategies with a polyfill-first approach. This skill consumes the structured output from [skill:dotnet-version-detection] (TFM, C# version, preview flags) and provides actionable guidance on backporting language features, handling runtime gaps, and validating API compatibility across target frameworks.
Scope
- Decision matrix: polyfill vs conditional compilation
- PolySharp for compiler-synthesized polyfills
- SimonCropp/Polyfill for BCL API backporting
- Conditional compilation with TFM-based preprocessor symbols
- Multi-targeting .csproj patterns and TFM-specific source files
- API compatibility validation (EnablePackageValidation, ApiCompat tool)
Out of scope
- TFM detection logic -- see [skill:dotnet-version-detection]
- Version upgrade lane selection -- see [skill:dotnet-version-upgrade]
- Platform-specific UI frameworks (MAUI, Blazor) -- see respective framework skills
- Cloud deployment configuration
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