Book Image

.NET MAUI for C# Developers

By : Jesse Liberty, Rodrigo Juarez
3.7 (6)
Book Image

.NET MAUI for C# Developers

3.7 (6)
By: Jesse Liberty, Rodrigo Juarez

Overview of this book

While UI plays a pivotal role in retaining users in a highly competitive landscape, maintaining the same UI can be tricky if you use different languages for different platforms, leading to mismatches and un-synced pages. In this book, you'll see how .NET MAUI allows you to create a real-world application that will run natively on different platforms. By building on your C# experience, you’ll further learn to create beautiful and engaging UI using XAML, architect a solid app, and discover best practices for this Microsoft platform. The book starts with the fundamentals and quickly moves on to intermediate and advanced topics on laying out your pages, navigating between them, and adding controls to gather and display data. You’ll explore the key architectural pattern of Model-View-ViewModel: and ways to leverage it. You’ll also use xUnit and NSubstitute to create robust and reliable code. By the end of this book, you’ll be well-equipped to leverage .NET MAUI and create an API for your app to interact with a web frontend to the backend data using C#.
Table of Contents (18 chapters)
Part 1 – Getting Started
Part 2 – Intermediate Topics
Part 3 – Advanced Topics

Dependency injection

Until now, anytime we needed an object inside a class, we passed in the object or we created it in the body of the class. This creates a dependency (the receiving method is dependent on the object passed in or created.) This approach creates tight coupling – which just means that both classes are coupled together and changing one risks having to change the other. For example, in PreferencesViewModel, we need a PreferenceService object. The approach we’ve taken so far is to new one up in the constructor:

private readonly PreferenceService service;
public PreferencesViewModel()
  service = new();

Dependency injection decouples the classes and allows for more powerful unit testing, as we’ll see when we continue the discussion of mocks. Rather than newing-up a PreferenceService, we want to pass in an interface and have .NET MAUI create it for us (that is, no calling function will add the interface to the constructor call –...