temporary

GetStartedApp/App.axaml

@@ -0,0 +1,15 @@
+<Application xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             x:Class="GetStartedApp.App"
+             xmlns:local="using:GetStartedApp"
+             RequestedThemeVariant="Default">
+             <!-- "Default" ThemeVariant follows system theme variant. "Dark" or "Light" are other available options. -->
+
+    <Application.DataTemplates>
+        <local:ViewLocator/>
+    </Application.DataTemplates>
+  
+    <Application.Styles>
+        <FluentTheme />
+    </Application.Styles>
+</Application>

GetStartedApp/App.axaml.cs

@@ -0,0 +1,28 @@
+using Avalonia;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Markup.Xaml;
+using GetStartedApp.ViewModels;
+using GetStartedApp.Views;
+
+namespace GetStartedApp;
+
+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();
+    }
+}

GetStartedApp/GetStartedApp.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <BuiltInComInteropSupport>true</BuiltInComInteropSupport>
+    <ApplicationManifest>app.manifest</ApplicationManifest>
+    <AvaloniaUseCompiledBindingsByDefault>true</AvaloniaUseCompiledBindingsByDefault>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Folder Include="Models\" />
+    <AvaloniaResource Include="Assets\**" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Avalonia" Version="11.0.10" />
+    <PackageReference Include="Avalonia.Desktop" Version="11.0.10" />
+    <PackageReference Include="Avalonia.Themes.Fluent" Version="11.0.10" />
+    <PackageReference Include="Avalonia.Fonts.Inter" Version="11.0.10" />
+    <!--Condition below is needed to remove Avalonia.Diagnostics package from build output in Release configuration.-->
+    <PackageReference Condition="'$(Configuration)' == 'Debug'" Include="Avalonia.Diagnostics" Version="11.0.10" />
+    <PackageReference Include="Avalonia.ReactiveUI" Version="11.0.10" />
+  </ItemGroup>
+</Project>

GetStartedApp/Program.cs

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+using Avalonia;
+using Avalonia.ReactiveUI;
+using System;
+
+namespace GetStartedApp;
+
+sealed 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()
+            .UseReactiveUI();
+}

GetStartedApp/ViewLocator.cs

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+using System;
+using Avalonia.Controls;
+using Avalonia.Controls.Templates;
+using GetStartedApp.ViewModels;
+
+namespace GetStartedApp;
+
+public class ViewLocator : IDataTemplate
+{
+
+    public Control? Build(object? data)
+    {
+        if (data is null)
+            return null;
+        
+        var name = data.GetType().FullName!.Replace("ViewModel", "View", StringComparison.Ordinal);
+        var type = Type.GetType(name);
+
+        if (type != null)
+        {
+            var control = (Control)Activator.CreateInstance(type)!;
+            control.DataContext = data;
+            return control;
+        }
+        
+        return new TextBlock { Text = "Not Found: " + name };
+    }
+
+    public bool Match(object? data)
+    {
+        return data is ViewModelBase;
+    }
+}

GetStartedApp/ViewModels/MainWindowViewModel.cs

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+namespace GetStartedApp.ViewModels;
+
+public class MainWindowViewModel : ViewModelBase
+{
+#pragma warning disable CA1822 // Mark members as static
+    public string Greeting => "Welcome to asdf Avalonia!";
+#pragma warning restore CA1822 // Mark members as static
+}

GetStartedApp/ViewModels/ViewModelBase.cs

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+using ReactiveUI;
+
+namespace GetStartedApp.ViewModels;
+
+public class ViewModelBase : ReactiveObject
+{
+}

GetStartedApp/Views/MainWindow.axaml

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+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:vm="using:GetStartedApp.ViewModels"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+        x:Class="GetStartedApp.Views.MainWindow"
+        x:DataType="vm:MainWindowViewModel"
+        Title="GetStartedApp">
+        <!-- Icon="/Assets/avalonia-logo.ico" -->
+
+    <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) -->
+        <vm:MainWindowViewModel/>
+    </Design.DataContext>
+
+    <StackPanel>
+        <Border Margin="5" CornerRadius="10" Background="LightBlue">
+            <TextBlock Margin="5" FontSize="24" HorizontalAlignment="Center" Text="Temperature Converter"></TextBlock>
+        </Border>
+        <Grid ShowGridLines="True" Margin="5" ColumnDefinitions="120, 100" RowDefinitions="Auto, Auto, Auto">  
+            <Label Grid.Row="0" Grid.Column="0" Margin="10">Celsius</Label>
+            <TextBox Grid.Row="0" Grid.Column="1" Margin="0 5" Text="0" Name="celsius"/>
+            <Label Grid.Row="1" Grid.Column="0" Margin="10">Fahrenheit</Label>
+            <TextBox Grid.Row="1"  Grid.Column="1" Margin="0 5" Text="0" Name="fahrenheit"/>
+            <Button Grid.Row="2" Grid.Column="1" Margin="0 5" Click="ButtonClicked">Calculate</Button>
+        </Grid>
+  </StackPanel>
+
+</Window>

GetStartedApp/Views/MainWindow.axaml.cs

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+using Avalonia.Controls;
+using Avalonia.Interactivity;
+using System.Diagnostics;
+using System;
+
+namespace GetStartedApp.Views;
+
+public partial class MainWindow : Window
+{
+    public MainWindow()
+    {
+        InitializeComponent();
+    }
+
+    public void ButtonClicked(object source, RoutedEventArgs args)
+    {
+        if (Double.TryParse(celsius.Text, out double C))
+        {
+            var F = C * (9d / 5d) + 32;
+            fahrenheit.Text = F.ToString("0.0");
+        }
+        else
+        {
+            celsius.Text = "0";
+            fahrenheit.Text = "0";
+        }
+    }
+}

GetStartedApp/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="GetStartedApp.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>