Book Image

Customizing ASP.NET Core 6.0 - Second Edition

By : Jürgen Gutsch
Book Image

Customizing ASP.NET Core 6.0 - Second Edition

By: Jürgen Gutsch

Overview of this book

ASP.NET Core is packed full of hidden features for building sophisticated web applications – but if you don’t know how to customize it, you’re not making the most of its capabilities. Customizing ASP.NET Core 6.0 is a book that will teach you all about tweaking the knobs at various layers and take experienced programmers’ skills to a new level. This updated second edition covers the latest features and changes in the .NET 6 LTS version, along with new insights and customization techniques for important topics such as authentication and authorization. You’ll also learn how to work with caches and change the default behavior of ASP.NET Core apps. This book will show you the essential concepts relating to tweaking the framework, such as configuration, dependency injection, routing, action filters, and more. As you progress, you'll be able to create custom solutions that meet the needs of your use case with ASP.NET Core. Later chapters will cover expert techniques and best practices for using the framework for your app development needs, from UI design to hosting. Finally, you'll focus on the new endpoint routing in ASP.NET Core to build custom endpoints and add third-party endpoints to your web apps for processing requests faster. By the end of this book, you'll be able to customize ASP.NET Core to develop better, more robust apps.

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Table of Contents (18 chapters)
Preface
Preface
ASP.NET Core architecture overview
What is covered in this book?
What is not covered and why?
Who this book is for
What this book covers
To get the most out of this book
Download the example code files
Download the color images
Conventions used
Get in touch
Share Your Thoughts
1
Chapter 1: Customizing Logging
Chapter 1: Customizing Logging
Technical requirements
Configuring logging
Creating a custom logger
Plugging in an existing third-party logger provider
Summary
Free Chapter
2
Chapter 2: Customizing App Configuration
Chapter 2: Customizing App Configuration
Technical requirements
Configuring the configuration
Using typed configurations
Configuration using INI files
Configuration providers
Summary
Further reading
3
Chapter 3: Customizing Dependency Injection
Chapter 3: Customizing Dependency Injection
Technical requirements
Using a different DI container
Exploring the ConfigureServices method
Using a different ServiceProvider
Introducing Scrutor
Summary
4
Chapter 4: Configuring and Customizing HTTPS with Kestrel
Chapter 4: Configuring and Customizing HTTPS with Kestrel
Technical requirements
Introducing Kestrel
Setting up Kestrel
Summary
5
Chapter 5: Configuring WebHostBuilder
Chapter 5: Configuring WebHostBuilder
Technical requirements
Re-examining WebHostBuilderContext
Summary
Further reading
6
Chapter 6: Using Different Hosting Models
Chapter 6: Using Different Hosting Models
Technical requirements
Setting up WebHostBuilder
Setting up Kestrel
Setting up HTTP.sys
Hosting on IIS
Using Nginx or Apache on Linux
Summary
Further reading
7
Chapter 7: Using IHostedService and BackgroundService
Chapter 7: Using IHostedService and BackgroundService
Technical requirements
Introducing IHostedService
Introducing BackgroundService
Implementing the new Worker Service projects
Summary
8
Chapter 8: Writing Custom Middleware
Chapter 8: Writing Custom Middleware
Technical requirements
Introducing middleware
Writing custom middleware
Exploring the potential of middleware
Using middleware in ASP.NET Core 3.0 and later
Summary
9
Chapter 9: Working with Endpoint Routing
Chapter 9: Working with Endpoint Routing
Technical requirements
Exploring endpoint routing
Creating custom endpoints
Creating a more complex endpoint
Summary
10
Chapter 10: Customizing ASP.NET Core Identity
Chapter 10: Customizing ASP.NET Core Identity
Technical requirements
Introducing ASP.NET Core Identity
Customizing IdentityUser
Customizing the Identity views
Summary
11
Chapter 11: Configuring Identity Management
Chapter 11: Configuring Identity Management
Technical requirements
Introducing IdentityManager2
Setting up IdentityManager2
Securing IdentityManager2
Summary
12
Chapter 12: Content Negotiation Using a Custom OutputFormatter
Chapter 12: Content Negotiation Using a Custom OutputFormatter
Technical requirements
Introducing OutputFormatter objects
Testing the web API
Creating custom OutputFormatter objects
Summary
13
Chapter 13: Managing Inputs with Custom ModelBinder
Chapter 13: Managing Inputs with Custom ModelBinder
Technical requirements
Introducing ModelBinder
Preparing the test data
Preparing the test project
Creating PersonsCsvBinder
Using ModelBinder
Testing ModelBinder
Summary
Further reading
14
Chapter 14: Creating a Custom ActionFilter
Chapter 14: Creating a Custom ActionFilter
Technical requirements
Introducing ActionFilter
Using ActionFilter
Summary
Further reading
15
Chapter 15: Working with Caches
Chapter 15: Working with Caches
Technical requirements
Why do we need caching?
HTTP-based caching
Caching using ResponseCachingMiddleware
Caching specific areas using CacheTagHelper
Caching Manually
Summary
Further reading
16
Chapter 16: Creating Custom TagHelper
Chapter 16: Creating Custom TagHelper
Technical requirements
Introducing TagHelper
Creating custom Tag Helpers
Summary
Further reading
Why subscribe?
17
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Creating custom OutputFormatter objects

In this example, our aim is to create a VCard output to be able to import the person's contact details directly into Microsoft Outlook or any other contact database that supports VCards. Later in this section, we also want to create a CSV output formatter.

Both are text-based output formatters, and they will derive their values from TextOutputFormatter. Let's look at the steps to create the VCard output:

  1. Create a new class in a new file called VcardOutputFormatter.cs.
  2. Now, insert the following class skeleton in the new file. You will find the implementations of the empty methods in the following code snippets. The constructor contains the supported media types and content encodings:
    public class VcardOutputFormatter : TextOutputFormatter
{
    public string? ContentType { get; }
    public VcardOutputFormatter()
    {
       ...
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