Add project files.

Hyperbar/AppService.cs

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+using Microsoft.Extensions.Hosting;
+using System.Collections.ObjectModel;
+
+namespace Hyperbar;
+
+public class ObservableCollectionViewModel : 
+    ObservableCollection<object>
+{
+
+}
+
+public class AppService(IEnumerable<IInitializer> initializers) : 
+    IHostedService
+{
+    public async Task StartAsync(CancellationToken cancellationToken)
+    {
+        foreach (var initializer in initializers)
+        {
+            await initializer.InitializeAsync();
+        }
+    }
+
+    public Task StopAsync(CancellationToken cancellationToken)
+    {
+        throw new System.NotImplementedException();
+    }
+}

Hyperbar/DataTemplateDescriptor.cs

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+namespace Hyperbar;
+
+public record DataTemplateDescriptor :
+    IDataTemplateDescriptor
+{
+    public required Type DataType { get; set; }
+
+    public required Type TemplateType { get; set; }
+
+    public required object Key { get; set; }
+}
+

Hyperbar/Hyperbar.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+	<PropertyGroup>
+		<TargetFramework>net8.0</TargetFramework>
+		<ImplicitUsings>enable</ImplicitUsings>
+		<Nullable>enable</Nullable>
+	</PropertyGroup>
+	<ItemGroup>
+		<PackageReference Include="Microsoft.Extensions.Hosting" Version="8.0.0" />
+	</ItemGroup>
+</Project>

Hyperbar/IDataTemplateDescriptor.cs

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+namespace Hyperbar;
+
+public interface IDataTemplateDescriptor
+{
+    Type DataType { get; set; }
+    object Key { get; set; }
+    Type TemplateType { get; set; }
+}
+

Hyperbar/IInitializer.cs

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+namespace Hyperbar;
+
+public interface IInitializer
+{
+    Task InitializeAsync();
+}
+
+public interface IDataTemplateSelector
+{
+
+}

Hyperbar/IServiceCollectionExtensions.cs

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+using Microsoft.Extensions.DependencyInjection;
+
+namespace Hyperbar;
+
+public static class IServiceCollectionExtensions
+{
+    public static IServiceCollection AddDataTemplate<TData, TTemplate>(this IServiceCollection services, 
+        object? key = null)
+    {
+        Type dataType = typeof(TData);
+        Type templateType = typeof(TTemplate);
+
+        key ??= dataType.Name;
+
+        services.AddKeyedTransient(dataType, key);
+        services.AddKeyedTransient(templateType, key);
+
+        services.AddTransient<IDataTemplateDescriptor>(provider => new DataTemplateDescriptor
+        {
+            DataType = dataType,
+            TemplateType = templateType,
+            Key = key
+        });
+
+        return services;
+    }
+}

Hyperbar/ITemplateFactory.cs

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+namespace Hyperbar;
+
+public interface ITemplateFactory
+{
+    object? Create(object key);
+}

Hyperbar/ITemplatedViewModel.cs

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+namespace Hyperbar;
+
+public interface ITemplatedViewModel
+{
+    ITemplateFactory TemplateFactory { get; }
+}