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Home > Web Development > Web Services > ASP.NET Core 9 Web API Cookbook
ASP.NET Core 9 Web API Cookbook
ASP.NET Core 9 Web API Cookbook

ASP.NET Core 9 Web API Cookbook: Over 60 hands-on recipes for building and securing enterprise web APIs with REST, GraphQL, and more

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ASP.NET Core 9 Web API Cookbook

Mastering Resource Creation and Validation

In this chapter, we will explore creating, validating, and updating data in a web API. We will cover POST, PUT, and PATCH operations, uncovering the critical concepts of model validation and model binding – essential features of ASP.NET Core. Additionally, we will explore Scalar, a new and user-friendly option for an interactive OpenAPI UI. This will allow us to move beyond Swagger UI, which is no longer included as the default tool for generating OpenAPI documentation.

We will focus on the best practice of validating inputs added to our database. To do this, we will use model validation and model binding, which together form the model state – a dictionary containing both the state of the model and the validation results.

The following are the recipes we’re going to cover in this chapter:

  • Model validation with data annotations
  • Creating a custom validation attribute
  • Implementing complex validation...

Technical requirements

For the recipes in this chapter, you’ll need the following:

  • Git: Make sure you have Git installed.
  • .NET 9 SDK: The .NET 9 SDK is available here: https://dotnet.microsoft.com/en-us/download/dotnet/9.0.
  • DB Browser for SQLite: Unlike Chapter 1, where we used the in-memory SQLite provider for EF Core, this chapter will use a real SQLite database that persists to disk. SQLite works with a single file rather than connecting to a server with a connection string. SQLite, due to its simplicity, allows you to concentrate on understanding validation best practices without the extra layers of checks and guardrails seen in databases such as Microsoft SQL Server. It can be helpful to view the database we will be creating with DB Browser for SQLite, which is available here: https://sqlitebrowser.org/.
  • A note on mappers: The projects in this chapter use both EF Core and Dapper. Please check the GitHub end projects folder to see the full Dapper versions...

Model validation with data annotations

We will start by exploring the simplest form of model validation in ASP.NET Core – model validation using data annotations.

Data annotations allow you to decorate model properties with attributes that specify validation criteria. This ensures that the data received from the user adheres to defined rules and formats, preventing invalid data from causing errors or inconsistencies. By utilizing data annotations, we can also provide more specific feedback when a client POSTs data that does not conform to the model’s properties. This technique is a lot better than returning a vague generic error message to the client. Instead of returning a generic error, this approach guides the client on what properties need to be modified to meet the required criteria.

In this recipe, we will use DataAnnotations to apply model validation. The starter project for this chapter is a Web API with two controllers. Both controllers have one endpoint...

Creating a custom validation attribute

In this recipe, we will create our own custom validation attribute to validate incoming data to our API. We will also learn how to retry model binding with TryValidateModel.

Getting ready

This recipe picks up where the preceding recipe left off. You can find a starter project here: https://github.com/PacktPublishing/ASP.NET-9-Web-API-Cookbook/tree/main/start/chapter02/CustomAnnotations

How to do it…

  1. Create a new custom validation attribute class in the Models folder, which inherits from ValidationAttribute:
    using System.ComponentModel.DataAnnotations;
namespace CustomAnnotations.Models;
public class AllowedValuesAttribute : ValidationAttribute
{
    private readonly List<string> _allowedValues;
    public AllowedValuesAttribute(params string[] allowedValues)
    {
        _allowedValues = allowedValues?.ToList() ?? new...

Implementing complex validation logic with IValidateObject

In this recipe, we will implement custom validation logic in our DTO class using IValidateObject. This will allow us to create validation logic for an entire model instead of only one property.

Getting ready

The starting code for this project resides here: https://github.com/PacktPublishing/ASP.NET-9-Web-API-Cookbook/tree/main/start/chapter02/IValidateObject.

How to do It…

  1. Modify your existing EventRegistrationDTO to inherit from IValidateObject:
    using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
namespace events.Models
{
    public class EventRegistrationDTO : IValidatableObject
    {
    …
  2. Create the Validate method, which yields a ValidationResult if the date is not in the future:
    public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
    ...

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...

Updating resources with PUT and AutoMapper

This recipe will demonstrate how to update an existing resource using PUT requests. Proper handling of resource updates is crucial for maintaining data integrity. For this task, you will learn how to use AutoMapper, a popular object-to-object mapping library. AutoMapper facilitates the mapping between Data Transfer Objects (DTOs) and entity models. AutoMapper also helps us reduce the boilerplate code needed for manual property mapping.

Getting ready

The repository is available here: https://github.com/PacktPublishing/ASP.NET-9-Web-API-Cookbook/tree/main/end/chapter02/AutoMapper. This starter project is different from the one we left off with, so it is crucial that you clone it if you want to follow along. The starter project includes an AdditionalContactInfo model for storing secondary contact details, which we’ll be mapping alongside our main EventRegistration model.

How to do it…

  1. Clone the repository using...

Managing cascade delete with AutoMapper

In this recipe, we will leverage our AutoMapper setup to implement the deletion of EventRegistration and its dependent entity, AdditionalContact. This ensures that when EventRegistration is deleted, its related AdditionalContact information is also handled.

Getting ready

The starting code for this project is found here: https://github.com/PacktPublishing/ASP.NET-9-Web-API-Cookbook/tree/main/start/chapter02/CascadeDelete. This recipe picks up where the preceding recipe ended.

How to do it…

  1. Add the DELETE endpoint to your controller. In your EFEventsController, let’s get started by adding the following attributes for a new DELETE endpoint:
    [HttpDelete("{id}")]
[EndpointSummary("Delete an existing event registration")]
[EndpointDescription("DELETE to remove an existing event registration.")]
[ProducesResponseType(StatusCodes.Status200OK)]
[ProducesResponseType(StatusCodes.Status404NotFound...

Updating specific model fields with PATCH and JsonPatchDocument

Using a PATCH request, we can update specific fields of a data entity (resource) without sending the entire object to the endpoint. In this recipe, we will leverage the JsonPatchDocument library to target and modify only the fields you need to change. This approach ensures minimal data transfer and precise updates to your resources.

Getting ready

The code for the starter project resides here: chapter02\start\JsonPatchDocument. This recipe picks up where the previous one left off.

How to do it…

  1. First, install the required packages:
    dotnet add package Microsoft.AspNetCore.JsonPatch
dotnet add package Microsoft.AspNetCore.Mvc.NewtonSoftJson

    We are not going to use System.Text.Json as our JSON provider in this example. Although it is possible to set up JsonPatch with System.Text.Json, it is more work. Import the Mvc.Formatters namespace and register that you would like to use Newtonsoft for Json on our...

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Key benefits

  • Master the lifecycle of ASP.NET Core web APIs by confidently building, testing, monitoring, and securing your applications
  • Explore advanced topics like GraphQL, SignalR, and microservices to create feature-rich APIs
  • Discover cloud deployment strategies to ensure your APIs are ready for modern infrastructure
  • Purchase of the print or Kindle book includes a free PDF eBook

Description

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.

Who is this book for?

This book is for intermediate to advanced developers—whether you're a .NET, backend, full-stack, or DevOps professional—looking to build and secure APIs with ASP.NET Core. It’s also ideal for those experienced in Java or Go who want to transition to ASP.NET Core, or developers familiar with C# and .NET aiming to deepen their API skills. A working knowledge of web APIs and the .NET ecosystem is assumed, so you can jump straight into practical recipes

What you will learn

  • Implement HybridCache with stampede protection to replace distributed and in-memory caches
  • Perform unit, integration, and contract testing to ensure robustness and reliability
  • Optimize API performance using output and response caching with tag-based invalidation
  • Design custom middleware for rate limiting, centralized exception handling, health checks, and more
  • Streamline API troubleshooting using Serilog's structured logging and Seq's powerful log visualization for quick insights
  • Secure your APIs with authentication, authorization, and HTTPS enforcement
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Publication date : Apr 24, 2025
Length: 344 pages
Edition : 1st
Language : English
ISBN-13 : 9781835880340
Category :
Web Development
Languages :
C#
Concepts :
Web Services
Tools :
ASP.NET

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Publication date : Apr 24, 2025
Length: 344 pages
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Language : English
ISBN-13 : 9781835880340
Category :
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Languages :
C#
Concepts :
Web Services
Tools :
ASP.NET

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Table of Contents

13 Chapters
Chapter 1: Practical Data Access in ASP.NET Core Web APIs Chevron down icon Chevron up icon
Chapter 1: Practical Data Access in ASP.NET Core Web APIs
Technical requirements
Creating a mock database for EF Core with Bogus
Using ProblemDetails to return more robust error information
Creating a categories endpoint using the new LINQ CountBy() method
Implementing KeySet pagination
Configuring a CORS policy to expose pagination metadata
Implementing efficient first- and last-page access with EF Core
Testing the API in PowerShell
Using the new AggregateBy LINQ method to return the average price per category
Chapter 2: Mastering Resource Creation and Validation Chevron down icon Chevron up icon
Chapter 2: Mastering Resource Creation and Validation
Technical requirements
Model validation with data annotations
Creating a custom validation attribute
Implementing complex validation logic with IValidateObject
Creating complex validation rules with FluentValidation
Updating resources with PUT and AutoMapper
Managing cascade delete with AutoMapper
Updating specific model fields with PATCH and JsonPatchDocument
Chapter 3: Securing Your Web API Chevron down icon Chevron up icon
Chapter 3: Securing Your Web API
Technical requirements
Rejecting HTTP requests with custom ProblemDetails middleware
Setting up HTTPS on a custom domain – creating a self-signed certificate with PowerShell
Setting up ASP.NET Core Identity
Using cookie authentication in ASP.NET Core Web API
JWT authentication with Identity
Implementing policy-based and role-based authentication
Learn more on Discord
Chapter 4: Creating Custom Middleware Chevron down icon Chevron up icon
Chapter 4: Creating Custom Middleware
Technical requirements
Building a health report for your API
Adding health checks to OpenAPI using the new document transformers
Creating a custom database performance health check
Creating custom middleware for adding security headers
Creating factory middleware for centralized data transformation
Chapter 5: Creating Comprehensive Logging Solutions Chevron down icon Chevron up icon
Chapter 5: Creating Comprehensive Logging Solutions
Technical requirements
Logging all requests with Serilog and Seq
Improving request logs with custom DiagnosticContext properties
Logging controller and action method names
Unified request logging – combining ASP.NET Core’s HttpLogging with Serilog and Seq
Crafting Serilog log objects in ASP.NET Core controllers
Configuring Seq and Serilog with an API Key
Chapter 6: Real-Time Communication with SignalR Chevron down icon Chevron up icon
Chapter 6: Real-Time Communication with SignalR
Technical requirements
Creating a real-time opinion poll in SignalR
JWT authentication flow – identity from controller login to SignalR connection
Invoking a hub method from an HTTP controller – announcing user login
User customization with IUserIdProvider
Sending direct messages via SignalR
Implementing admin-controlled group management in SignalR
Learn more on Discord
Chapter 7: Building Robust API Tests: a Guide to Unit and Integration Testing Chevron down icon Chevron up icon
Chapter 7: Building Robust API Tests: a Guide to Unit and Integration Testing
Technical requirements
Unit testing an API service method with xUnit
Unit testing with AutoFixture, NSubstitute, and FluentAssertions
Organizing unit tests with a base service class
Testing pagination with custom UrlHelper and NSubstitute
Controller unit tests with custom fixtures
Web API integration testing
Authentication in integration testing
Chapter 8: GraphQL: Designing Flexible and Efficient APIs Chevron down icon Chevron up icon
Chapter 8: GraphQL: Designing Flexible and Efficient APIs
Technical requirements
Real-time updates via GraphQL subscriptions
Mutations for modifying data in GraphQL
Implementing efficient pagination in GraphQL
Filtering and sorting with GraphQL
Distributed GraphQL with Hot Chocolate Fusion
Chapter 9: Deploying and Managing Your WebAPI in the Cloud Chevron down icon Chevron up icon
Chapter 9: Deploying and Managing Your WebAPI in the Cloud
Technical requirements
Building with Azure – core service integration through geolocation
Azure Key Vault – securing configuration with custom health checks
Creating an API gateway with a YARP reverse proxy and a custom load-balancing policy
Migrating a distributed API to .NET Aspire for unified orchestration and monitoring
Integrating dockerized services with .NET Aspire – an example with Prometheus
Learn more on Discord
Chapter 10: The Craft of Caching Chevron down icon Chevron up icon
Chapter 10: The Craft of Caching
Technical requirements
Manual client-side response caching with HTTP headers
Validating client-side cache with Last-Modified headers
Client-side ETag cache validation with the ResponseCache attribute
Output caching with Aspire Redis
Server-side caching with IDistributedCache and Redis via .NET Aspire
Using the new HybridCache library to simplify distributed caching
Chapter 11: Beyond the Core Chevron down icon Chevron up icon
Chapter 11: Beyond the Core
Technical requirements
Microservice communication via gRPC and .NET Aspire
Implementing bidirectional streaming with gRPC in .NET Aspire
Implementing real-time updates with Dapr pub/sub in .NET Aspire
Sharing state between services with Dapr state stores
Index Chevron down icon Chevron up icon
Index
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About the authors

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Profile icon Luke Avedon
Luke Avedon
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Luke Avedon has been contributing to the software development lifecycle for nearly a decade. In recent years, he has focused exclusively on .NET development. He helped to design and implement an ASP.NET Core API for a leading healthcare company, serving as the backbone for a system supporting nearly one billion USD in revenue. Luke has also developed secure solutions for integrating vendor APIs and upgrading legacy .NET APIs to help comply with Department of Defense GCC high-security standards. Additionally, he contributed to the development of large-scale AI models for a major technology company, gaining valuable insights into the intersection of AI and software engineering.
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Profile icon Garry Cabrera
Garry Cabrera
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Garry Cabrera has seven years of expertise in building robust backend APIs for major financial institutions, including Credit Suisse and Bank of America. Though he specializes in .NET and Java development, Garry's technical versatility extends to Python and Groovy, enabling him to adapt solutions to diverse requirements. His deep knowledge of relational databases—SQL Server, MySQL, and Oracle—combined with proficiency in ORMs such as Hibernate, allows him to create efficient and scalable data access layers. Garry's integration expertise with Apache Camel and SSIS has proven invaluable in establishing seamless data flows across complex enterprise systems.
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A custom duty or localized taxes may be applicable on the shipment and would be charged by the recipient country outside of the EU27 which should be paid by the customer and these duties are not included in the shipping charges been charged on the order.

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The amount of duty payable varies greatly depending on the imported goods, the country of origin and several other factors like the total invoice amount or dimensions like weight, and other such criteria applicable in your country.

For example:

  • If you live in Mexico, and the declared value of your ordered items is over $ 50, for you to receive a package, you will have to pay additional import tax of 19% which will be $ 9.50 to the courier service.
  • Whereas if you live in Turkey, and the declared value of your ordered items is over € 22, for you to receive a package, you will have to pay additional import tax of 18% which will be € 3.96 to the courier service.
How can I cancel my order? Chevron down icon Chevron up icon

Cancellation Policy for Published Printed Books:

You can cancel any order within 1 hour of placing the order. Simply contact customercare@packt.com with your order details or payment transaction id. If your order has already started the shipment process, we will do our best to stop it. However, if it is already on the way to you then when you receive it, you can contact us at customercare@packt.com using the returns and refund process.

Please understand that Packt Publishing cannot provide refunds or cancel any order except for the cases described in our Return Policy (i.e. Packt Publishing agrees to replace your printed book because it arrives damaged or material defect in book), Packt Publishing will not accept returns.

What is your returns and refunds policy? Chevron down icon Chevron up icon

Return Policy:

We want you to be happy with your purchase from Packtpub.com. We will not hassle you with returning print books to us. If the print book you receive from us is incorrect, damaged, doesn't work or is unacceptably late, please contact Customer Relations Team on customercare@packt.com with the order number and issue details as explained below:

  1. If you ordered (eBook, Video or Print Book) incorrectly or accidentally, please contact Customer Relations Team on customercare@packt.com within one hour of placing the order and we will replace/refund you the item cost.
  2. Sadly, if your eBook or Video file is faulty or a fault occurs during the eBook or Video being made available to you, i.e. during download then you should contact Customer Relations Team within 14 days of purchase on customercare@packt.com who will be able to resolve this issue for you.
  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on customercare@packt.com within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged? Chevron down icon Chevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela