Updating the App.xaml.cs and the App.xaml

Open the App.xaml.cs file and replace the content with the following code:
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using MvvmCross.Platforms.Uap.Core;
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using MvvmCross.Platforms.Uap.Views;
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​
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namespace MvvmCrossDemo.Uwp
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{
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    /// <summary>
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    /// Provides application-specific behavior to supplement the default Application class.
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    /// </summary>
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    sealed partial class App
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    {
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        /// <summary>
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        /// Initializes the singleton application object.  This is the first line of authored code
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        /// executed, and as such is the logical equivalent of main() or WinMain().
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        /// </summary>
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        public App()
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        {
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            this.InitializeComponent();
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        }
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    }
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​
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    public abstract class UWPApplication : MvxApplication<MvxWindowsSetup<Core.App>, Core.App>
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    {
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    }
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}
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You can find the codes here: https://github.com/MvvmCross/MvvmCross/blob/develop/ContentFiles/UWP/App.xaml.cs.pp .
UwpApplication is an abstract class that contains the necessary information to run the MvvmCross framework. We can also use our customized Setup class instead of the default Setup class. Just keep it as simple as possible at the moment.
Now it is time to update the App.xaml. We need to modify the XAML code to make sure the App class inherits from the UwpApplication. You can find it here: https://github.com/MvvmCross/MvvmCross/blob/develop/ContentFiles/UWP/App.xaml.pp . Replace the content of the file with the following code:
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<local:UwpApplication
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    x:Class="MvvmCrossDemo.Uwp.App"
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    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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    xmlns:local="using:MvvmCrossDemo.Uwp">
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    <Application.Resources>
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        <x:String x:Key="WelcomeText">Hello World!</x:String>
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    </Application.Resources>
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</local:UwpApplication>
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Using MvvmCross to create your first Xamarin App - Previous

Creating the UWP project

Adding the UWP View

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