API Development in C# (.NET): From Basics to Industrial Application

The book "API Development in C# (.NET)" is a comprehensive practical guide that will take you from designing your first endpoint to building production-grade microservices. The author, Alexey Voronov, a senior developer with 10 years of experience, shares proven patterns and best practices of the .NET ecosystem.

What is this book about?

You will learn how to create high-performance and secure APIs using modern technologies:

• ASP.NET Core — configuring routing, Middleware, dependency injection
• RESTful services — resource design, versioning, pagination, filtering
• gRPC — efficient binary communication, Protocol Buffers, streaming
• Entity Framework Core — Code First, migrations, query optimization, working with PostgreSQL and SQL Server
• Authentication and Authorization — JWT, OAuth 2.0, IdentityServer, access policies
• Testing — unit tests, integration tests, Postman, Swagger/OpenAPI
• Deployment and Monitoring — Docker, Kubernetes, logging (Serilog), metrics (Prometheus)

Who is this book for?

• C# Backend developers transitioning from monoliths to microservices
• Fullstack programmers looking to master the server-side on .NET
• Team Leads and Architects seeking proven patterns for API design
• Students and Junior developers who want to gain systematic knowledge and a project portfolio

What will you learn and be able to do after reading?

• Design REST APIs considering HATEOAS and OpenAPI specifications
• Implement CQRS and Event Sourcing using MediatR and RabbitMQ
• Configure CI/CD pipelines for .NET projects
• Conduct load testing and profiling
• Write clean, testable code using Repository and Unit of Work patterns
• Integrate third-party services via HttpClient and Polly

Each chapter contains practical examples ready for use in real projects. At the end of the book, you will find the complete code for a working microservice for an online store with Swagger documentation and deployment in Docker.

The book is suitable both for self-study and as a desktop reference. All examples are relevant for .NET 8 and Visual Studio 2022.