Rename

DotNetSolutionTools.App/App.axaml

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+<Application xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             x:Class="DotNetSolutionTools.App.App"
+             RequestedThemeVariant="Default">
+    <Application.Styles>
+        <FluentTheme />
+    </Application.Styles>
+</Application>

DotNetSolutionTools.App/App.axaml.cs

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+using Avalonia;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Markup.Xaml;
+using DotNetSolutionTools.App.ViewModels;
+using DotNetSolutionTools.App.Views;
+
+namespace DotNetSolutionTools.App;
+
+public partial class App : Application
+{
+    public override void Initialize()
+    {
+        AvaloniaXamlLoader.Load(this);
+    }
+
+    public override void OnFrameworkInitializationCompleted()
+    {
+        if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
+        {
+            desktop.MainWindow = new MainWindow() { DataContext = new MainWindowViewModel() };
+        }
+
+        base.OnFrameworkInitializationCompleted();
+    }
+}

DotNetSolutionTools.App/DotNetSolutionTools.App.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+    <PropertyGroup>
+        <OutputType>WinExe</OutputType>
+        <TargetFramework>net7.0</TargetFramework>
+        <Nullable>enable</Nullable>
+        <BuiltInComInteropSupport>true</BuiltInComInteropSupport>
+        <ApplicationManifest>app.manifest</ApplicationManifest>
+        <AvaloniaUseCompiledBindingsByDefault>true</AvaloniaUseCompiledBindingsByDefault>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <AvaloniaResource Include="Assets\**"/>
+    </ItemGroup>
+
+    <ItemGroup>
+        <ProjectCapability Include="Avalonia"/>
+        <TrimmerRootAssembly Include="Avalonia.Themes.Fluent"/>
+    </ItemGroup>
+
+    <ItemGroup>
+        <PackageReference Include="Avalonia" Version="11.0.0-preview8"/>
+        <PackageReference Include="Avalonia.Desktop" Version="11.0.0-preview8"/>
+        <PackageReference Include="Avalonia.Themes.Fluent" Version="11.0.0-preview8"/>
+        <PackageReference Include="Avalonia.Fonts.Inter" Version="11.0.0-preview8"/>
+        <!--Condition below is needed to remove Avalonia.Diagnostics package from build output in Release configuration.-->
+        <PackageReference Condition="'$(Configuration)' == 'Debug'" Include="Avalonia.Diagnostics" Version="11.0.0-preview8"/>
+        <PackageReference Include="CommunityToolkit.Mvvm" Version="8.2.0"/>
+    </ItemGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\DotNetSolutionTools.Core\DotNetSolutionTools.Core.csproj" />
+    </ItemGroup>
+</Project>

DotNetSolutionTools.App/Program.cs

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+using System;
+using Avalonia;
+
+namespace DotNetSolutionTools.App;
+
+class Program
+{
+    // Initialization code. Don't use any Avalonia, third-party APIs or any
+    // SynchronizationContext-reliant code before AppMain is called: things aren't initialized
+    // yet and stuff might break.
+    [STAThread]
+    public static void Main(string[] args) =>
+        BuildAvaloniaApp().StartWithClassicDesktopLifetime(args);
+
+    // Avalonia configuration, don't remove; also used by visual designer.
+    public static AppBuilder BuildAvaloniaApp() =>
+        AppBuilder.Configure<App>().UsePlatformDetect().WithInterFont().LogToTrace();
+}

DotNetSolutionTools.App/ViewModels/MainWindowViewModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.IO;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+using Avalonia;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Platform.Storage;
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using DotNetSolutionTools.Core;
+
+namespace DotNetSolutionTools.App.ViewModels;
+
+public partial class MainWindowViewModel : ViewModelBase
+{
+    [ObservableProperty]
+    private string _solutionFolderPath;
+
+    [ObservableProperty]
+    private string _solutionFilePath;
+
+    [ObservableProperty]
+    private string? _fileText;
+
+    [ObservableProperty]
+    private ObservableCollection<string> _parityResults = new ObservableCollection<string>()
+    {
+        "Test"
+    };
+
+    [RelayCommand]
+    private async Task ExecuteParityChecker(CancellationToken token)
+    {
+        var results =
+            DotNetSolutionTools.Core.SolutionParityChecker.CompareSolutionAndCSharpProjects(
+                SolutionFolderPath,
+                SolutionFilePath
+            );
+        ParityResults.Clear();
+        foreach (var result in results)
+        {
+            ParityResults.Add(result);
+        }
+    }
+
+    [RelayCommand]
+    private async Task FormatCsProjFile(CancellationToken token)
+    {
+        FormatCsproj.FormatCsprojFile(SolutionFilePath);
+    }
+
+    [RelayCommand]
+    private async Task LoadSolutionFile(CancellationToken token)
+    {
+        ErrorMessages?.Clear();
+        try
+        {
+            var file = await DoOpenFilePickerAsync();
+            if (file is null)
+                return;
+
+            SolutionFilePath = file.Path.AbsolutePath;
+        }
+        catch (Exception e)
+        {
+            ErrorMessages?.Add(e.Message);
+        }
+    }
+
+    [RelayCommand]
+    private async Task LoadSolutionFolder(CancellationToken token)
+    {
+        ErrorMessages?.Clear();
+        try
+        {
+            var folder = await DoOpenFolderPickerAsync();
+            if (folder is null)
+                return;
+
+            SolutionFolderPath = folder.Path.AbsolutePath;
+        }
+        catch (Exception e)
+        {
+            ErrorMessages?.Add(e.Message);
+        }
+    }
+
+    private async Task<IStorageFile?> DoOpenFilePickerAsync()
+    {
+        // For learning purposes, we opted to directly get the reference
+        // for StorageProvider APIs here inside the ViewModel.
+
+        // For your real-world apps, you should follow the MVVM principles
+        // by making service classes and locating them with DI/IoC.
+
+        // See IoCFileOps project for an example of how to accomplish this.
+        if (
+            Application.Current?.ApplicationLifetime
+                is not IClassicDesktopStyleApplicationLifetime desktop
+            || desktop.MainWindow?.StorageProvider is not { } provider
+        )
+            throw new NullReferenceException("Missing StorageProvider instance.");
+
+        var files = await provider.OpenFilePickerAsync(
+            new FilePickerOpenOptions() { Title = "Open Text File", AllowMultiple = false }
+        );
+
+        return files?.Count >= 1 ? files[0] : null;
+    }
+
+    private async Task<IStorageFolder?> DoOpenFolderPickerAsync()
+    {
+        // For learning purposes, we opted to directly get the reference
+        // for StorageProvider APIs here inside the ViewModel.
+
+        // For your real-world apps, you should follow the MVVM principles
+        // by making service classes and locating them with DI/IoC.
+
+        // See IoCFileOps project for an example of how to accomplish this.
+        if (
+            Application.Current?.ApplicationLifetime
+                is not IClassicDesktopStyleApplicationLifetime desktop
+            || desktop.MainWindow?.StorageProvider is not { } provider
+        )
+            throw new NullReferenceException("Missing StorageProvider instance.");
+
+        var folder = await provider.OpenFolderPickerAsync(
+            new FolderPickerOpenOptions() { Title = "Open Text File", AllowMultiple = false }
+        );
+
+        return folder?.Count >= 1 ? folder[0] : null;
+    }
+}

DotNetSolutionTools.App/ViewModels/ViewModelBase.cs

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+using System.Collections.ObjectModel;
+using CommunityToolkit.Mvvm.ComponentModel;
+
+namespace DotNetSolutionTools.App.ViewModels;
+
+public partial class ViewModelBase : ObservableObject
+{
+    protected ViewModelBase()
+    {
+        ErrorMessages = new ObservableCollection<string>();
+    }
+
+    [ObservableProperty]
+    private ObservableCollection<string>? _errorMessages;
+}

DotNetSolutionTools.App/Views/MainWindow.axaml

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+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:viewModels="clr-namespace:DotNetSolutionTools.App.ViewModels"
+        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+        x:Class="DotNetSolutionTools.App.Views.MainWindow"
+        x:DataType="viewModels:MainWindowViewModel"
+        Icon="/Assets/avalonia-logo.ico"
+        Title="FileOps">
+    <Design.DataContext>
+        <!-- This only sets the DataContext for the previewer in an IDE,
+             to set the actual DataContext for runtime, set the DataContext property in code (look at App.axaml.cs) -->
+        <viewModels:MainWindowViewModel />
+    </Design.DataContext>
+    <Panel>
+        <StackPanel>
+            <TextBlock>Welcome to Avalonia!</TextBlock>
+            <Button Command="{Binding LoadSolutionFolderCommand}" >Select Solution Folder</Button>
+            <Button Command="{Binding LoadSolutionFileCommand}">Select Solution File</Button>
+            <Button Command="{Binding ExecuteParityCheckerCommand}">Check Solution Parity</Button>
+            <Button Command="{Binding FormatCsProjFileCommand}">Format CSharp Project File</Button>
+            <TextBlock Name="SolutionFilePath" Text="{Binding SolutionFilePath}" />
+            <TextBlock Name="SolutionFolderPath" Text="{Binding SolutionFolderPath}" />
+            <ListBox Name="Results" ItemsSource="{Binding ParityResults}"/>
+            <ListBox ItemsSource="{Binding ErrorMessages}"/>
+        </StackPanel>
+    </Panel>
+    
+</Window>

DotNetSolutionTools.App/Views/MainWindow.axaml.cs

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+using Avalonia.Controls;
+using Avalonia.Interactivity;
+using DotNetSolutionTools.App.ViewModels;
+
+namespace DotNetSolutionTools.App.Views;
+
+public partial class MainWindow : Window
+{
+    public MainWindow()
+    {
+        InitializeComponent();
+    }
+}

DotNetSolutionTools.App/app.manifest

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+<?xml version="1.0" encoding="utf-8"?>
+<assembly manifestVersion="1.0" xmlns="urn:schemas-microsoft-com:asm.v1">
+  <!-- This manifest is used on Windows only.
+       Don't remove it as it might cause problems with window transparency and embedded controls.
+       For more details visit https://learn.microsoft.com/en-us/windows/win32/sbscs/application-manifests -->
+  <assemblyIdentity version="1.0.0.0" name="SolutionParityChecker.App.Desktop"/>
+
+  <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
+    <application>
+      <!-- A list of the Windows versions that this application has been tested on
+           and is designed to work with. Uncomment the appropriate elements
+           and Windows will automatically select the most compatible environment. -->
+
+      <!-- Windows 10 -->
+      <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}" />
+    </application>
+  </compatibility>
+</assembly>