Hallo .NET 9.0: Practical ASP.NET Core Minimal API is your comprehensive guide to mastering modern web API development using Microsoft's latest .NET 9.0 framework. This practical book takes you on a hands-on journey through the innovative world of ASP.NET Core Minimal APIs, showcasing how to build efficient, lightweight, and high-performance web services with minimal code and maximum functionality. From basic "Hello World" applications to advanced deployment scenarios, each chapter builds upon the previous one, ensuring a smooth learning curve for developers of all skill levels.

The book emphasizes real-world application through seven carefully crafted exercises that cover essential aspects of modern API development. You'll explore RESTful service creation, implement the new built-in OpenAPI documentation (replacing Swagger), develop calculator services, handle file operations, and master exception handling and logging. The final chapters delve into middleware, filters, and comprehensive deployment strategies including containerization with Docker, cloud deployment, and performance monitoring.

Written with a focus on .NET 9.0's latest features and improvements, this book serves as both a learning resource for newcomers and a practical reference for experienced developers transitioning to the minimal API approach. The hands-on labs, complete with HTTP testing files and detailed explanations, ensure you gain practical experience that can be immediately applied to real-world projects.

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