Delpin Susai Raj Tuesday, 26 October 2021

Xamarin.Forms - How to use Fody property in MVVM

 In this blog post, you will learn how to use Fody in MVVM in Xamarin.Forms App

Introduction

Xamarin.Forms code runs on multiple platforms - each of which has its own filesystem. This means that reading and writing files is most easily done using the native file APIs on each platform. Alternatively, embedded resources are a simpler solution to distribute data files with an app.

Fody

Fody is a library for IL weaving (the process to manipulate/inject code in IL). Fody will update automatically our code for us to add new cool features.

Fody is Injects code which raises the PropertyChanged event, into property setters of classes which implement INotifyPropertyChanged.

Prerequisites

  • Visual Studio 2017 or later (Windows or Mac)

Let's Start

Setting up a Xamarin.Forms Project

 Start by creating a new Xamarin.Forms project. You will learn more by going through the steps yourself.

 Create a new or existing Xamarin forms(.Net standard) Project. With Android and iOS Platform. 

Setup UI

Now, Create a UI for your requirement. I just created a simple UI for LoginPage

LoginPage.xaml

Normal Property Creation with Data Binding

The Data Binding is the connection between the XAML and ViewModel of your app. You use it to connect a control (ex: text) of your UI to your logic. Let’s assume that we have an Entry and we want to link it to our ViewModel.

Following code is as we use to create the view model property be like.

LoginPage.Xaml.cs

Result

Install Fody

Install the following Nuget from Nuget Manager In your Visual Studio.

  1. Fody
  2. PropertyChanged.Fody
In your project install the Fody plugin (only in your PCL/.Net Standard project, you don’t need to install it in the Android, iOS, UWP projects

Fody NuGet

PropertyChanged.Fody

Add FodyWeavers.xml

Add FodyWeavers.xml file in your .net standard project.

Fody Properties

Now, Simply add property with { get; set; }. 

Result

Conclusion

I hope you have understood how to use fody in MVVM in Xamarin.Forms App

Thanks for reading. Please share your comments and feedback. Happy Coding :)

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