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

Error handling in routing

What do we do with errors—exceptions caught during the processing of a request, for example, when a resource is not found? You can use routing for this. Here, we will present a few strategies:

  • Routing
  • Adding a catch-all route
  • Showing developer error pages
  • Using the status code pages middleware

We will learn about these in the following sections.

Routing errors to controller routes

You can force a specific controller's action to be called when an error occurs by callingUseExceptionHandler:


What you put in this view (Error) is entirely up to you, mind you.

You can even do something more interesting, that is, register middleware to execute upon the occurrence of an error, as follows:

app.UseExceptionHandler(errorApp =>
    errorApp.Run(async context =>
        var errorFeature...