file dialog

SolutionParityChecker.App/App.axaml

@@ -2,8 +2,6 @@
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
              x:Class="SolutionParityChecker.App.App"
              RequestedThemeVariant="Default">
-             <!-- "Default" ThemeVariant follows system theme variant. "Dark" or "Light" are other available options. -->
-
     <Application.Styles>
         <FluentTheme />
     </Application.Styles>

SolutionParityChecker.App/App.axaml.cs

@@ -1,6 +1,8 @@
 using Avalonia;
 using Avalonia.Controls.ApplicationLifetimes;
 using Avalonia.Markup.Xaml;
+using SolutionParityChecker.App.ViewModels;
+using SolutionParityChecker.App.Views;
 
 namespace SolutionParityChecker.App;
 

SolutionParityChecker.App/MainWindow.axaml

@@ -1,24 +0,0 @@
-<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:app="clr-namespace:SolutionParityChecker.App"
-        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
-        x:Class="SolutionParityChecker.App.MainWindow"
-        Title="SolutionParityChecker.App"
-        x:DataType="app:MainWindowViewModel">
-    
-    <Window.DataContext>
-        <app:MainWindowViewModel />
-    </Window.DataContext>
-    
-    <Panel>
-        <StackPanel>
-            <TextBlock>Welcome to Avalonia!</TextBlock>
-            <Button Click="LoadSolutionFolder">Select Solution Folder</Button>
-            <Button Click="LoadSolutionFile">Select Solution File</Button>
-            <TextBlock Name="SolutionFilePath" Text="{Binding SolutionFilePath}" />
-            <TextBlock Name="SolutionFolderPath" Text="{Binding SolutionFolderPath}" />
-        </StackPanel>
-    </Panel>
-</Window>

SolutionParityChecker.App/MainWindowViewModel.cs

@@ -1,7 +0,0 @@
-namespace SolutionParityChecker.App;
-
-public class MainWindowViewModel
-{
-    public string SolutionFolderPath { get; set; } = string.Empty;
-    public string SolutionFilePath { get; set; } = string.Empty;
-}

SolutionParityChecker.App/Models/AppState.cs

@@ -1,6 +0,0 @@
-namespace SolutionParityChecker.App.Models;
-
-public class AppState
-{
-    
-}

SolutionParityChecker.App/Program.cs

@@ -1,5 +1,5 @@
-using Avalonia;
-using System;
+using System;
+using Avalonia;
 
 namespace SolutionParityChecker.App;
 
@@ -9,13 +9,10 @@ class Program
     // 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);
+    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();
-}
+    public static AppBuilder BuildAvaloniaApp() =>
+        AppBuilder.Configure<App>().UsePlatformDetect().WithInterFont().LogToTrace();
+}

SolutionParityChecker.App/Services/DialogService.cs

@@ -1,6 +0,0 @@
-namespace SolutionParityChecker.App.Services;
-
-public class DialogService
-{
-    
-}

SolutionParityChecker.App/SolutionParityChecker.App.csproj

@@ -8,13 +8,22 @@
         <AvaloniaUseCompiledBindingsByDefault>true</AvaloniaUseCompiledBindingsByDefault>
     </PropertyGroup>
 
+    <ItemGroup>
+        <AvaloniaResource Include="Assets\**"/>
+    </ItemGroup>
 
     <ItemGroup>
-        <PackageReference Include="Avalonia" Version="11.0.4" />
-        <PackageReference Include="Avalonia.Desktop" Version="11.0.4" />
-        <PackageReference Include="Avalonia.Themes.Fluent" Version="11.0.4" />
-        <PackageReference Include="Avalonia.Fonts.Inter" Version="11.0.4" />
+        <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="'$(Configuration)' == 'Debug'" Include="Avalonia.Diagnostics" Version="11.0.4" />
+        <PackageReference Condition="'$(Configuration)' == 'Debug'" Include="Avalonia.Diagnostics" Version="11.0.0-preview8"/>
+        <PackageReference Include="CommunityToolkit.Mvvm" Version="8.2.0"/>
     </ItemGroup>
 </Project>

SolutionParityChecker.App/ViewModels/MainWindowViewModel.cs

@@ -0,0 +1,121 @@
+using System;
+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;
+
+namespace SolutionParityChecker.App.ViewModels;
+
+public partial class MainWindowViewModel : ViewModelBase
+{
+    public string SolutionFolderPath { get; set; } = string.Empty;
+    public string SolutionFilePath { get; set; } = string.Empty;
+
+    [ObservableProperty]
+    private string? _fileText;
+
+    [RelayCommand]
+    private async Task OpenFile(CancellationToken token)
+    {
+        ErrorMessages?.Clear();
+        try
+        {
+            var file = await DoOpenFilePickerAsync();
+            if (file is null)
+                return;
+
+            // Limit the text file to 1MB so that the demo won't lag.
+            if ((await file.GetBasicPropertiesAsync()).Size <= 1024 * 1024 * 1)
+            {
+                await using var readStream = await file.OpenReadAsync();
+                using var reader = new StreamReader(readStream);
+                FileText = await reader.ReadToEndAsync(token);
+            }
+            else
+            {
+                throw new Exception("File exceeded 1MB limit.");
+            }
+        }
+        catch (Exception e)
+        {
+            ErrorMessages?.Add(e.Message);
+        }
+    }
+
+    [RelayCommand]
+    private async Task SaveFile()
+    {
+        ErrorMessages?.Clear();
+        try
+        {
+            var file = await DoSaveFilePickerAsync();
+            if (file is null)
+                return;
+
+            // Limit the text file to 1MB so that the demo won't lag.
+            if (FileText?.Length <= 1024 * 1024 * 1)
+            {
+                var stream = new MemoryStream(Encoding.Default.GetBytes((string)FileText));
+                await using var writeStream = await file.OpenWriteAsync();
+                await stream.CopyToAsync(writeStream);
+            }
+            else
+            {
+                throw new Exception("File exceeded 1MB limit.");
+            }
+        }
+        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<IStorageFile?> DoSaveFilePickerAsync()
+    {
+        // 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 DepInject project for a sample 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.");
+
+        return await provider.SaveFilePickerAsync(
+            new FilePickerSaveOptions() { Title = "Save Text File" }
+        );
+    }
+}

SolutionParityChecker.App/ViewModels/ViewModelBase.cs

@@ -0,0 +1,15 @@
+using System.Collections.ObjectModel;
+using CommunityToolkit.Mvvm.ComponentModel;
+
+namespace SolutionParityChecker.App.ViewModels;
+
+public partial class ViewModelBase : ObservableObject
+{
+    protected ViewModelBase()
+    {
+        ErrorMessages = new ObservableCollection<string>();
+    }
+    
+    [ObservableProperty] 
+    private ObservableCollection<string>? _errorMessages;
+}

SolutionParityChecker.App/Views/MainWindow.axaml

@@ -0,0 +1,29 @@
+<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:SolutionParityChecker.App.ViewModels"
+        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+        x:Class="SolutionParityChecker.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 Click="LoadSolutionFolder">Select Solution Folder</Button>
+            <Button Click="LoadSolutionFile">Select Solution File</Button>
+            <Button Command="{Binding OpenFileCommand}">Open File</Button>
+            <Button Command="{Binding SaveFileCommand}">Save File</Button>
+            <TextBlock Name="SolutionFilePath" Text="{Binding SolutionFilePath}" />
+            <TextBlock Name="SolutionFolderPath" Text="{Binding SolutionFolderPath}" />
+            <ListBox DockPanel.Dock="Bottom" ItemsSource="{Binding ErrorMessages}"/>
+        </StackPanel>
+    </Panel>
+    
+</Window>

SolutionParityChecker.App/Views/MainWindow.axaml.cs

@@ -1,7 +1,7 @@
 using Avalonia.Controls;
 using Avalonia.Interactivity;
 
-namespace SolutionParityChecker.App;
+namespace SolutionParityChecker.App.Views;
 
 public partial class MainWindow : Window
 {

SolutionParityChecker.App/app.manifest

@@ -1,7 +1,7 @@
 <?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 embeded controls.
+       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"/>