Book Image

The MVVM Pattern in .NET MAUI

By : Pieter Nijs
Book Image

The MVVM Pattern in .NET MAUI

By: Pieter Nijs

Overview of this book

In today's fast-paced world of modern software development, teams need to be efficient, productive, and capable of rapidly adapting to changes to deliver high-quality products, making it crucial for developers to write maintainable and easy-to-test code. The MVVM Pattern in .NET MAUI helps you to thoroughly explore the Model-View-View Model (MVVM) design pattern. The chapters show you how this pattern helps in structuring code to embrace the separation of concerns, allowing for loosely coupled user interface and application logic, which ultimately empowers you to write more robust, maintainable, and testable code. The book also highlights .NET MAUI's capabilities and features, and enables you to delve into the essential components within the framework that facilitate the application of the MVVM pattern. With the help of a sample application, this definitive guide takes a hands-on approach to walk you through both the essential and advanced usages of the MVVM pattern to ensure that you successfully apply the practical aspects of the pattern to your .NET MAUI projects. By the end of this book, you’ll have gained a comprehensive understanding of the MVVM design pattern and its relevance in the context of .NET MAUI, as well as developed the skills needed to successfully apply it in practice.
Table of Contents (20 chapters)
Free Chapter
1
Part 1: Key Concepts and Components
8
Part 2: Building a .NET MAUI App Using MVVM
13
Part 3: Mastering MVVM Development

Confirming or canceling navigation

As users interact with our application, there may be moments when they’re about to navigate away from a page containing unsaved changes or important input. To prevent potential data loss, it’s essential to prompt for confirmation before allowing such navigation. Let’s see how we could build this by leveraging the NavigationService that we built in the previous chapter:

  1. Let’s start by adding the following interface called INavigatable to the Navigation folder of the Recipes.Client.Core project:
    public interface INavigatable
    {
        Task<bool> CanNavigateFrom(NavigationType navigationType);
    }

    ViewModels that want to control whether the user is able to navigate can implement this interface. This is analogous to the other interfaces we introduced in the context of navigation, such as the INavigatedFrom, INavigatedTo, and INavigationParameterReceiver interfaces.

  2. Extend the INavigationInterceptor...