Add preliminary MvxHost and MvxHostBuilder inspired by Shiny and MAUI

Directory.Packages.props

@@ -3,6 +3,8 @@
     <PackageVersion Include="AsyncFixer" Version="1.6.0" />
     <PackageVersion Include="Microsoft.CodeAnalysis.NetAnalyzers" Version="7.0.0" />
     <PackageVersion Include="Microsoft.Extensions.Logging.Abstractions" Version="7.0.0" />
+    <PakcageVersion Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="7.0.0" />
+    <PakcageVersion Include="Microsoft.Extensions.DependencyInjection" Version="7.0.0" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.4.1" />
     <PackageVersion Include="Microsoft.SourceLink.GitHub" Version="1.1.1" />
     <PackageVersion Include="Microsoft.Windows.SDK.BuildTools" Version="10.0.22621.755" />

MvvmCross-macos.slnf

@@ -9,8 +9,8 @@
       "MvvmCross.Plugins\\All\\MvvmCross.Plugin.All.csproj",
       "MvvmCross.Plugins\\Color\\MvvmCross.Plugin.Color.csproj",
       "MvvmCross.Plugins\\FieldBinding\\MvvmCross.Plugin.FieldBinding.csproj",
-      "MvvmCross.Plugins\\Json\\MvvmCross.Plugin.Json.csproj",
       "MvvmCross.Plugins\\JsonLocalization\\MvvmCross.Plugin.JsonLocalization.csproj",
+      "MvvmCross.Plugins\\Json\\MvvmCross.Plugin.Json.csproj",
       "MvvmCross.Plugins\\Messenger\\MvvmCross.Plugin.Messenger.csproj",
       "MvvmCross.Plugins\\MethodBinding\\MvvmCross.Plugin.MethodBinding.csproj",
       "MvvmCross.Plugins\\ResourceLoader\\MvvmCross.Plugin.ResourceLoader.csproj",

MvvmCross/Hosting/IMvxHost.cs

@@ -0,0 +1,12 @@
+#nullable enable
+using Microsoft.Extensions.Logging;
+
+namespace MvvmCross.Hosting;
+
+public interface IMvxHost : IDisposable
+{
+    IServiceProvider Services { get; }
+    ILoggerFactory Logging { get; }
+
+    void Run();
+}

MvvmCross/Hosting/IMvxHostBuilder.cs

@@ -0,0 +1,12 @@
+#nullable enable
+using Microsoft.Extensions.DependencyInjection;
+
+namespace MvvmCross.Hosting;
+
+public interface IMvxHostBuilder
+{
+    Func<IServiceCollection, IServiceProvider>? ConfigureContainer { get; }
+    IServiceCollection Services { get; }
+
+    IMvxHost Build();
+}

MvvmCross/Hosting/MvxHost.cs

@@ -0,0 +1,48 @@
+#nullable enable
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Logging;
+using MvvmCross.Base;
+
+namespace MvvmCross.Hosting;
+
+public sealed class MvxHost : IMvxHost
+{
+    private static IMvxHost? _currentHost;
+
+    public static IMvxHost Current
+    {
+        get
+        {
+            if (_currentHost == null)
+                throw new InvalidOperationException("MvxHost has not been created yet. This means MvvmCross hasn't been initialized properly.");
+
+            return _currentHost;
+        }
+        private set => _currentHost = value;
+    }
+
+    public static bool IsInitialized => _currentHost != null;
+    public static IServiceProvider ServiceProvider => Current.Services;
+    public static ILoggerFactory LoggingFactory => Current.Logging;
+    public static T? GetService<T>() => ServiceProvider.GetService<T>();
+
+    public IServiceProvider Services { get; init; }
+    public ILoggerFactory Logging { get; init; }
+
+    public MvxHost(IServiceProvider serviceProvider, ILoggerFactory loggerFactory)
+    {
+        Services = serviceProvider;
+        Logging = loggerFactory;
+    }
+
+    public void Run()
+    {
+        Current = this;
+    }
+
+    public void Dispose()
+    {
+        Services.DisposeIfDisposable();
+        Logging.Dispose();
+    }
+}

MvvmCross/Hosting/MvxHostBuilder.cs

@@ -0,0 +1,42 @@
+#nullable enable
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Logging.Abstractions;
+
+namespace MvvmCross.Hosting;
+
+public class MvxHostBuilder : IMvxHostBuilder
+{
+    public Func<IServiceCollection, IServiceProvider> ConfigureContainer { get; }
+    public IServiceCollection Services { get; }
+
+    public MvxHostBuilder(
+        IServiceCollection? serviceCollection = null,
+        Func<IServiceCollection, IServiceProvider>? configureContainer = null)
+    {
+        Services = serviceCollection ?? new ServiceCollection();
+        ConfigureContainer = configureContainer ?? (s => s.BuildServiceProvider());
+    }
+
+    public virtual IMvxHost Build()
+    {
+        ConfigureDefaultNullLogging(Services);
+        var serviceCollection = ConfigureContainer(Services);
+        var loggerFactory = serviceCollection.GetRequiredService<ILoggerFactory>();
+
+        var host = new MvxHost(serviceCollection, loggerFactory);
+
+#if NET7_0_OR_GREATER
+#endif
+
+        host.Run();
+
+        return host;
+    }
+
+    private static void ConfigureDefaultNullLogging(IServiceCollection services)
+    {
+        services.AddSingleton<ILoggerFactory, NullLoggerFactory>();
+        services.AddSingleton(typeof(ILogger<>), typeof(NullLogger<>));
+    }
+}

MvvmCross/MvvmCross.csproj

@@ -82,5 +82,7 @@ This package contains the 'Core' libraries for MvvmCross</Description>
 
   <ItemGroup>
     <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" />
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" />
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection" />
   </ItemGroup>
 </Project>

Projects/Directory.Build.props

@@ -10,6 +10,5 @@
     <Version>7.0.0</Version>
 
     <IsLibraryProject>$(MSBuildProjectName.Contains('MvvmCross'))</IsLibraryProject>
-    <IsXamarinForms>$(MSBuildProjectName.Contains('.Forms'))</IsXamarinForms>
   </PropertyGroup>
 </Project>