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The MVVM Pattern in .NET MAUI
The MVVM Pattern in .NET MAUI

The MVVM Pattern in .NET MAUI: The definitive guide to essential patterns, best practices, and techniques for cross-platform app development

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The MVVM Pattern in .NET MAUI

What Is the MVVM Design Pattern?

The MVVM or Model-View-ViewModel pattern is a very commonly used design pattern in the .NET ecosystem, where it has proven to be a good fit for front-end frameworks that utilize XAML to build graphical user interfaces. And it’s not hard to see why.

This book will provide a good understanding of the MVVM design pattern and how to effectively apply it in .NET MAUI projects. It’s important to note that while we will focus on applying MVVM in the context of .NET MAUI, the MVVM pattern itself is not exclusive to the .NET ecosystem. It is a widely used design pattern that has gained popularity across various software development ecosystems, including frameworks like WPF, WinUI, and others. We’ll delve into various aspects of .NET MAUI to understand how it supports and enables the use of MVVM. Throughout the book, we’ll be building the “Recipes!” app as a practical example, showcasing various aspects of the MVVM...

Technical requirements

Although this chapter gives a theoretical overview of MVVM, later there is some code showing MVVM in action so you can start seeing the value this pattern brings. To implement this sample yourself, you’ll need the following: Visual Studio 2022 (17.3 or greater), or any IDE that allows you to create .NET MAUI apps. Near the end of Chapter 2, What Is .NET MAUI?, we’ll be looking at how to get your machine ready for developing .NET MAUI apps. The sample code can also be found on GitHub at https://github.com/PacktPublishing/MVVM-pattern-.NET-MAUI.

Looking at MVVM’s core components

MVVM provides a very clear way to separate UI from business logic, promoting code reusability, maintainability, and testability while allowing flexible UI design and changes.

Having business logic living in the code-behind quickly becomes challenging as applications grow in size and complexity. Code-behind refers to the practice of placing the business logic within the same file as the user interface elements, often resulting in a significant amount of code being invoked through event handlers. This frequently results in a tight coupling between UI elements and the underlying business logic, as UI elements are directly referenced and manipulated within the code. As a result, making adjustments to the UI and performing unit testing can become more difficult. Later on in this chapter, in the MVVM in action section, we will see what it means to have business logic in the code-behind and how that complicates maintainability, testing, et cetera...

Separation of concerns matters

Separation of concerns is an important principle in software development that aims to divide software design and implementation into distinct parts, each with a specific and well-defined responsibility. This principle helps developers create more maintainable and flexible applications by reducing the complexity of each individual component and allowing for more modular and reusable code.

In practical terms, separation of concerns means that different aspects of a system are separated and dealt with independently, without overlapping concerns. This is achieved by creating distinct layers or modules, each with its own well-defined responsibilities and interfaces, and minimizing the dependencies between them.

Let’s consider the example of a restaurant’s management system. In such a system, there could be several concerns like table reservation, order taking, kitchen operations, and billing. According to the principle of separation of...

MVVM in action

Let’s look at a very simple application that shows the user a quote of the day on the screen. When the user clicks a button on the screen, the application will fetch a quote of the day from an API and show it onscreen. Once the button is clicked, it should be hidden. The code-behind approach will show you how this app can be written without using the MVVM pattern, whereas the second example shows the same functionality implemented using MVVM with testability in mind.

The code-behind approach

In the following code snippet, there is no separation of concerns; all the code is handled in the code-behind of the XAML page. While this code seems to be doing what is expected, there is no easy, fast, or robust way to test whether it works. This is because all the logic is handled in the click event handler of the button.

In MainPage.xaml, we define a Button and a Label:

<Grid>
    <Button
       ...

Common misconceptions about MVVM

There are several common misconceptions about MVVM that can lead to misunderstandings of its principles and best practices. Let’s dispel some of these and provide clarity on the pattern.

There should be no code in the code-behind

While it is true that the main purpose of MVVM is to separate the presentation logic from the application logic, it is not necessarily the case that there should be no code in the code-behind. The code-behind can still be used to handle simple UI-related events or for any logic that is tightly coupled with the View.

In fact, there are scenarios where putting some code in the code-behind can be more efficient and maintainable than trying to move everything to the ViewModel. For example, handling UI animations, scrolling, and controlling focus or complex visual behaviors may be easier to implement in the code-behind rather than trying to do it through data binding.

To ensure proper separation of concerns in...

Summary

To summarize, the MVVM pattern separates the concerns of data, UI, and logic, which makes the application easier to test, modify, and extend. By using the Model to represent the data and business logic, the View to present the data to the user, and the ViewModel to mediate between the Model and the View, the MVVM pattern promotes a clear separation of responsibilities that makes it easier to develop and maintain complex applications. Additionally, the use of Commands and data binding provides a powerful way to handle user input and keep the UI in sync with the application’s state. Understanding the components of MVVM is crucial for building successful .NET MAUI applications that are maintainable, scalable, and easy to test.

In Chapter 2, What Is .NET MAUI?, we’ll dive into .NET MAUI so that you have a good understanding of this framework. If you already have a thorough knowledge of .NET MAUI, you can skip this chapter. If you know the basics of it, it should...

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Key benefits

  • Get to grips with the principles and benefits of the Model-View-ViewModel design pattern
  • Gain insights into .NET MAUI's MVVM-enabling components and effectively apply them with hands-on examples
  • Learn data binding, navigation, and testable code techniques to create dynamic, accessible, and localized apps
  • Purchase of the print or Kindle book includes a free PDF eBook

Description

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.

Who is this book for?

This book is for developers with experience in C# and basic knowledge of .NET MAUI or Xamarin.Forms who are looking to create cross-platform applications with .NET MAUI and leverage the MVVM pattern. Through practical examples and clear explanations, this book helps both newcomers and experienced developers master the application of MVVM principles within .NET MAUI projects.

What you will learn

  • Gain a thorough understanding of the MVVM design pattern
  • Get to grips with the components that enable MVVM in .NET MAUI
  • Apply the MVVM pattern in practice within .NET MAUI
  • Become proficient in data binding in .NET MAUI
  • Discover how to navigate from within a view model
  • Find out how to effectively write testable code and unit tests
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Table of Contents

19 Chapters
Part 1: Key Concepts and Components Chevron down icon Chevron up icon
Chapter 1: What Is the MVVM Design Pattern? Chevron down icon Chevron up icon
Chapter 2: What is .NET MAUI? Chevron down icon Chevron up icon
Chapter 3: Data Binding Building Blocks in .NET MAUI Chevron down icon Chevron up icon
Chapter 4: Data Binding in .NET MAUI Chevron down icon Chevron up icon
Chapter 5: Community Toolkits Chevron down icon Chevron up icon
Chapter 6: Working with Collections Chevron down icon Chevron up icon
Part 2: Building a .NET MAUI App Using MVVM Chevron down icon Chevron up icon
Chapter 7: Dependency Injection, Services, and Messaging Chevron down icon Chevron up icon
Chapter 8: Navigation in MVVM Chevron down icon Chevron up icon
Chapter 9: Handling User Input and Validation Chevron down icon Chevron up icon
Chapter 10: Working with Remote Data Chevron down icon Chevron up icon
Part 3: Mastering MVVM Development Chevron down icon Chevron up icon
Chapter 11: Creating MVVM-Friendly Controls Chevron down icon Chevron up icon
Chapter 12: Localization with MVVM Chevron down icon Chevron up icon
Chapter 13: Unit Testing Chevron down icon Chevron up icon
Chapter 14: Troubleshooting and Debugging Tips Chevron down icon Chevron up icon
Index Chevron down icon Chevron up icon
Other Books You May Enjoy Chevron down icon Chevron up icon

Customer reviews

Rating distribution
Full star icon Full star icon Full star icon Full star icon Full star icon 5
(4 Ratings)
5 star 100%
4 star 0%
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1 star 0%
Aaron Sep 05, 2024
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Great book about the MVVM pattern. I learned a lot!
Subscriber review Packt
Marco Aug 23, 2024
Full star icon Full star icon Full star icon Full star icon Full star icon 5
My new go-to reference for MVVM with .NET MAUI (full review: https://msicc.net/book-review-the-mvvm-pattern-in-net-maui/)
Subscriber review Packt
Tim Belvin Apr 18, 2024
Full star icon Full star icon Full star icon Full star icon Full star icon 5
The book is laid out in an easy to read fashion. It covers a wide range of topics - and in particular, it covers essential practices that are critical to development in .NET Maui.Njis begins with a thorough explanation of MVVM design principles, emphasizing the importance of separation of concerns for creating maintainable and testable code. He then explores .NET Maui capabilities and the components that enable the MVVM pattern.What separates this book apart is its practical approach. Great hands-on examples to work through to better understand the application of data binding, navigation and writing testable code.This book is for developers with experience in C# and a basic understanding of either Xamarin Forms or MAUI.
Amazon Verified review Amazon
Runaway Apr 04, 2024
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Ich habe das Buch zur Probe bekommen und bin selber seit fast 3 Jahren aktiv Xamarin/MAUI am entwickeln. Dieses Buch hätte mir damals viel Zeit gesparrt. Es bietet einen sehr guten Einstieg in die wichtigsten Grundsätze von Maui, das MVVM-Pattern. Bei jeder Applikation mit mehr als 3 Pages eine absolute Notwendigkeit.Das Buch erklärt Themen wie Observable Properties, ViewModels, Bindings usw. Es zeigt dabei sehr gut den Theoretischen Ansatz von Microsoft und darauffolgend Hilfestellungen wie z.B. die durchaus sinnvolle Nutzung des Community Toolkits.Der Autor hält dabei stets eine gute Balance die Theorie asuführlich zu erkären und geht auf viele Möglichkeiten von Klassen ein. Gleichzeitig erfährt man aber nicht mehr, als nötig. Dabei nutzt der Autor die Quellen bzw. Dokumentation von Microsoft auf ein sehr gutes Maß.Für jeden Anfänger zu empfehlen, der plant, sein Level an Professionalität in .NET Maui zu steigern. Ich freue mich dass die Community durch dieses Buch weiter gefördert wird.
Amazon Verified review Amazon
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