Book Image

Mastering Minimal APIs in ASP.NET Core

By : Andrea Tosato, Marco Minerva, Emanuele Bartolesi
Book Image

Mastering Minimal APIs in ASP.NET Core

By: Andrea Tosato, Marco Minerva, Emanuele Bartolesi

Overview of this book

The Minimal APIs feature, introduced in .NET 6, is the answer to code complexity and rising dependencies in creating even the simplest of APIs. Minimal APIs facilitate API development using compact code syntax and help you develop web APIs quickly. This practical guide explores Minimal APIs end-to-end and helps you take advantage of its features and benefits for your ASP.NET Core projects. The chapters in this book will help you speed up your development process by writing less code and maintaining fewer files using Minimal APIs. You’ll also learn how to enable Swagger for API documentation along with CORS and handle application errors. The book even promotes ideas to structure your code in a better way using the dependency injection library in .NET. Finally, you'll learn about performance and benchmarking improvements for your apps. By the end of this book, you’ll be able to fully leverage new features in .NET 6 for API development and explore how Minimal APIs are an evolution over classical web API development in ASP.NET Core.
Table of Contents (16 chapters)
Part 1: Introduction
Part 2: What’s New in .NET 6?
Part 3: Advanced Development and Microservices Concepts

Parameter binding

Parameter binding is the process that converts request data (i.e., URL paths, query strings, or the body) into strongly typed parameters that can be consumed by route handlers. ASP.NET Core minimal APIs support the following binding sources:

  • Route values
  • Query strings
  • Headers
  • The body (as JSON, the only format supported by default)
  • A service provider (dependency injection)

We’ll talk in detail about dependency injection in Chapter 4, Implementing Dependency Injection.

As we’ll see later in this chapter, if necessary, we can customize the way in which binding is performed for a particular input. Unfortunately, in the current version, binding from Form is not natively supported in minimal APIs. This means that, for example, IFormFile is not supported either.

To better understand how parameter binding works, let’s take a look at the following API:

var builder = WebApplication.CreateBuilder(args);