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Added sample for community toolkit
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‎part7-maui-mvvm-communitytoolkit-demo/MauiMvvmCommunityToolkitDemo.sln‎

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Microsoft Visual Studio Solution File, Format Version 12.00
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# Visual Studio Version 17
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VisualStudioVersion = 17.8.34112.27
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MinimumVisualStudioVersion = 10.0.40219.1
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Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "MauiMvvmDemo", "MauiMvvmDemo\MauiMvvmDemo.csproj", "{C50FA893-92DD-4E8B-90D4-8F791F376E29}"
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EndProject
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MauiMvvmDemo.ViewModels", "MauiMvvmDemo.ViewModels\MauiMvvmDemo.ViewModels.csproj", "{A79936A6-9775-41F7-9C4B-7E60CB74A12A}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
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Release|Any CPU = Release|Any CPU
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EndGlobalSection
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GlobalSection(ProjectConfigurationPlatforms) = postSolution
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{C50FA893-92DD-4E8B-90D4-8F791F376E29}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{C50FA893-92DD-4E8B-90D4-8F791F376E29}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{C50FA893-92DD-4E8B-90D4-8F791F376E29}.Debug|Any CPU.Deploy.0 = Debug|Any CPU
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{C50FA893-92DD-4E8B-90D4-8F791F376E29}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{C50FA893-92DD-4E8B-90D4-8F791F376E29}.Release|Any CPU.Build.0 = Release|Any CPU
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{C50FA893-92DD-4E8B-90D4-8F791F376E29}.Release|Any CPU.Deploy.0 = Release|Any CPU
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{A79936A6-9775-41F7-9C4B-7E60CB74A12A}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{A79936A6-9775-41F7-9C4B-7E60CB74A12A}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{A79936A6-9775-41F7-9C4B-7E60CB74A12A}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{A79936A6-9775-41F7-9C4B-7E60CB74A12A}.Release|Any CPU.Build.0 = Release|Any CPU
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE
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EndGlobalSection
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GlobalSection(ExtensibilityGlobals) = postSolution
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SolutionGuid = {A07C0295-93D2-4287-ABE8-69EEB451C2D8}
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EndGlobalSection
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EndGlobal

‎part7-maui-mvvm-communitytoolkit-demo/MauiMvvmDemo.ViewModels/Commands/Command.cs‎

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using System.Windows.Input;
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namespace MauiMvvmDemo.ViewModels.Commands;
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public class Command : ICommand
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{
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private readonly Action<object?> _action;
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private readonly Func<object?, bool>? _canExecute;
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public event EventHandler? CanExecuteChanged;
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public Command(Action<object?> action)
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{
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_action = action;
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}
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public Command(Action<object?> action, Func<object?, bool> canExecute)
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{
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_action = action;
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_canExecute = canExecute;
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}
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public bool CanExecute(object? parameter) =>
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_canExecute?.Invoke(parameter) ?? true;
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public void Execute(object? parameter) =>
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_action?.Invoke(parameter);
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}

‎part7-maui-mvvm-communitytoolkit-demo/MauiMvvmDemo.ViewModels/MauiMvvmDemo.ViewModels.csproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<TargetFramework>net8.0</TargetFramework>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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</PropertyGroup>
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<ItemGroup>
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<PackageReference Include="CommunityToolkit.Mvvm" Version="8.2.1" />
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</ItemGroup>
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</Project>

‎part7-maui-mvvm-communitytoolkit-demo/MauiMvvmDemo.ViewModels/Messages/UsernameChangedMessage.cs‎

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namespace MauiMvvmDemo.ViewModels.Messages;
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public record class UsernameChangedMessage(string NewUsername);

‎part7-maui-mvvm-communitytoolkit-demo/MauiMvvmDemo.ViewModels/Models/SelectedField.cs‎

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using CommunityToolkit.Mvvm.ComponentModel;
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namespace MauiMvvmDemo.ViewModels.Models;
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public partial class SelectedField : ObservableObject
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{
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[ObservableProperty]
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private string _color = string.Empty;
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public SelectedField()
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{
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}
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public SelectedField(string color)
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{
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Color = color;
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}
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public static implicit operator SelectedField(string color) => new SelectedField(color);
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public static implicit operator string(SelectedField value) => value.Color;
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}

‎part7-maui-mvvm-communitytoolkit-demo/MauiMvvmDemo.ViewModels/Pages/MainPageVM.cs‎

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using CommunityToolkit.Mvvm.ComponentModel;
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using CommunityToolkit.Mvvm.Input;
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using CommunityToolkit.Mvvm.Messaging;
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using MauiMvvmDemo.ViewModels.Messages;
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using MauiMvvmDemo.ViewModels.Models;
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using System.Collections.ObjectModel;
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namespace MauiMvvmDemo.ViewModels.Pages;
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public partial class MainPageVM : ObservableObject
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{
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[ObservableProperty]
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private string _username = string.Empty;
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public MainPageVM()
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{
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ResetSelectedFields(); // Initialize SelectedFields
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// Messenger can be used to communicate between pages or controls:
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// Sample for receiving message
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//WeakReferenceMessenger.Default.Register<UsernameChangedMessage>(this, (recipient, message) =>
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//{
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// //
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//});
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//// Sample for sending message
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//WeakReferenceMessenger.Default.Send(new UsernameChangedMessage("My new Username"));
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}
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public ICollection<string> AvailableColors { get; } = new string[]
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{
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"Red",
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"Blue",
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"Green",
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"Yellow",
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"Orange",
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"Purple"
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};
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public ObservableCollection<SelectedField> SelectedFields { get; } = new();
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public ObservableCollection<IEnumerable<SelectedField>> Moves { get; } = new();
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[RelayCommand(CanExecute = nameof(CanExecuteMakeMoveCommand))]
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private async Task MakeMoveAsync()
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{
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Moves.Add(SelectedFields.ToArray()); // ToArray to copy the values
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ResetSelectedFields();
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await Task.Delay(100); // simulates some async logic
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}
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private bool CanExecuteMakeMoveCommand() =>
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true; // e.g. validation logic here
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private void ResetSelectedFields()
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{
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SelectedFields.Clear();
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for (int i = 0; i < 4; i++)
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SelectedFields.Add(new SelectedField());
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}
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}

‎part7-maui-mvvm-communitytoolkit-demo/MauiMvvmDemo/App.xaml‎

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<?xml version = "1.0" encoding = "UTF-8" ?>
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<Application xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
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xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
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xmlns:local="clr-namespace:MauiMvvmDemo"
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x:Class="MauiMvvmDemo.App">
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<Application.Resources>
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<ResourceDictionary>
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<ResourceDictionary.MergedDictionaries>
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<ResourceDictionary Source="Resources/Styles/Colors.xaml" />
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<ResourceDictionary Source="Resources/Styles/Styles.xaml" />
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</ResourceDictionary.MergedDictionaries>
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</ResourceDictionary>
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</Application.Resources>
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</Application>

‎part7-maui-mvvm-communitytoolkit-demo/MauiMvvmDemo/App.xaml.cs‎

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namespace MauiMvvmDemo;
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public partial class App : Application
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{
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public App()
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{
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InitializeComponent();
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MainPage = new AppShell();
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}
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}

‎part7-maui-mvvm-communitytoolkit-demo/MauiMvvmDemo/AppShell.xaml‎

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<?xml version="1.0" encoding="UTF-8" ?>
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<Shell
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x:Class="MauiMvvmDemo.AppShell"
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xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
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xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
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xmlns:pages="clr-namespace:MauiMvvmDemo.Pages"
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Shell.FlyoutBehavior="Disabled"
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Title="MauiMvvmDemo">
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<ShellContent
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Title="Home"
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ContentTemplate="{DataTemplate pages:MainPage}"
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Route="MainPage" />
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</Shell>

‎part7-maui-mvvm-communitytoolkit-demo/MauiMvvmDemo/AppShell.xaml.cs‎

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namespace MauiMvvmDemo;
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public partial class AppShell : Shell
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{
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public AppShell()
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{
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InitializeComponent();
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}
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}

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