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ASP.NET Core 9 Web API Cookbook

ASP.NET Core 9 Web API Cookbook

By : Luke Avedon, Garry Cabrera
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ASP.NET Core 9 Web API Cookbook

ASP.NET Core 9 Web API Cookbook

5 (1)
By: Luke Avedon, Garry Cabrera

Overview of this book

Discover what makes ASP.NET Core 9 a powerful and versatile framework for building modern web APIs that are both scalable and secure. This comprehensive, recipe-based guide leverages the authors’ decade-long experience in software development to equip developers with the knowledge to create robust web API solutions using the framework's most powerful features. Designed for intermediate to advanced .NET developers, this cookbook contains hands-on recipes that demonstrate how to efficiently build, optimize, and secure APIs using this cutting-edge technology. You'll master essential topics, such as creating RESTful APIs, implementing advanced data access strategies, securing your APIs, creating custom middleware, and enhancing your logging capabilities. The book goes beyond traditional API development by introducing GraphQL, SignalR, and gRPC, offering insights into how these technologies can extend the reach of your APIs. To prepare you for real-world challenges, the recipes cover testing methodologies, cloud deployment, legacy system integration, and advanced concepts like microservices and Hangfire. By the end of this book, you’ll gain the expertise needed to build and manage enterprise-grade web APIs with ASP.NET Core 9. *Email sign-up and proof of purchase required
Table of Contents (14 chapters)
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Creating complex validation rules with FluentValidation

In this recipe, we will learn how to create complex validation rules using the FluentValidation library. FluentValidation offers a more fluent and flexible way to define validation logic.

Getting ready

We are going to continue working with the same DTO. However, all the validation rules have been removed – both the simple data annotations and the rules created via IValidateObject. The code for this project resides here: chapter02/FluentValidation.

How to do it…

  1. Open the project in Visual Studio Code.
  2. Open the terminal and type dotnet run.
  3. Open the browser and go to http://localhost:5217/scalar/chapter2.

    You have a basic API with some DataAnnotations and a custom DataAnnotations attribute on the DTO.

  4. Install the FluentValidation NuGet package:
    dotnet add package FluentValidation.AspNetCore
  5. Note that our DTO currently has no validation rules. Add the following code to the EventRegistrationDTO...
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ASP.NET Core 9 Web API Cookbook
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