dotnet-system-commandline
dotnet-system-commandline
System.CommandLine 2.0 stable API for building .NET CLI applications. Covers RootCommand, Command, Option<T>, Argument<T>, SetAction for handler binding, ParseResult-based value access, custom type parsing, validation, tab completion, and testing with TextWriter capture.
Version assumptions: .NET 8.0+ baseline. System.CommandLine 2.0.0+ (stable NuGet package, GA since November 2025). All examples target the 2.0.0 GA API surface.
Breaking change note: System.CommandLine 2.0.0 GA differs significantly from the pre-release beta4 API. Key changes: SetHandler replaced by SetAction, ICommandHandler removed in favor of SynchronousCommandLineAction/AsynchronousCommandLineAction, InvocationContext removed (ParseResult passed directly), CommandLineBuilder and AddMiddleware removed, IConsole removed in favor of TextWriter properties, and the System.CommandLine.Hosting/System.CommandLine.NamingConventionBinder packages discontinued. Do not use beta-era patterns.
Scope
- RootCommand, Command, Option, Argument hierarchy
- SetAction handler binding (sync and async)
- ParseResult-based value access
- Custom type parsing and validation
- Tab completion and directives
- Testing with InvocationConfiguration and TextWriter capture
- Migration from beta4 to 2.0.0 GA
- Dependency injection integration without System.CommandLine.Hosting
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