Book Image

Modern Web Development with ASP.NET Core 3 - Second Edition

By : Ricardo Peres
Book Image

Modern Web Development with ASP.NET Core 3 - Second Edition

By: Ricardo Peres

Overview of this book

ASP.NET has been the preferred choice of web developers for a long time. With ASP.NET Core 3, Microsoft has made internal changes to the framework along with introducing new additions that will change the way you approach web development. This second edition has been thoroughly updated to help you make the most of the latest features in the framework, right from gRPC and conventions to Blazor, which has a new chapter dedicated to it. You’ll begin with an overview of the essential topics, exploring the Model-View-Controller (MVC) pattern, various platforms, dependencies, and frameworks. Next, you’ll learn how to set up and configure the MVC environment, before delving into advanced routing options. As you advance, you’ll get to grips with controllers and actions to process requests, and later understand how to create HTML inputs for models. Moving on, you'll discover the essential aspects of syntax and processes when working with Razor. You'll also get up to speed with client-side development and explore the testing, logging, scalability, and security aspects of ASP.NET Core. Finally, you'll learn how to deploy ASP.NET Core to several environments, such as Azure, Amazon Web Services (AWS), and Docker. By the end of the book, you’ll be well versed in development in ASP.NET Core and will have a deep understanding of how to interact with the framework and work cross-platform.
Table of Contents (26 chapters)
Section 1: The Fundamentals of ASP.NET Core 3
Section 2: Improving Productivity
Section 3: Advanced Topics
Appendix A: The dotnet Tool

Hosting extensions

We are now going to talk about a mechanism to automatically load classes from other assemblies and another one for spawning background threads automatically. The first is used by .NET to automatically register certain extensions (namely for Azure and Application Insights), and the second is for performing work in the background, without getting in the way of the web app. Let's start with hosting code from external assemblies.

Hosting startup

There is an interface, IHostingStartup, that exposes a single method:

public class CustomHostingStartup : IHostingStartup
public void Configure(IWebHostBuilder builder)

This can be used at the host start up time to inject additional behavior into the host. IWebHostBuilder is exactly the same instance that is used in the Program.Main method. So, how is this class loaded? This is done in one of two ways:

  • By adding a [HostingStartup] attribute at the assembly level...