Add project files.

MvvmCommunityApp.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.4.33213.308
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MvvmCommunityApp", "MvvmCommunityApp\MvvmCommunityApp.csproj", "{A9F79E7F-91A0-4A7D-B2AD-2AF6D3C80B4B}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{A9F79E7F-91A0-4A7D-B2AD-2AF6D3C80B4B}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{A9F79E7F-91A0-4A7D-B2AD-2AF6D3C80B4B}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{A9F79E7F-91A0-4A7D-B2AD-2AF6D3C80B4B}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{A9F79E7F-91A0-4A7D-B2AD-2AF6D3C80B4B}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {96898E25-7C9A-4948-BC13-A8E9A0307BBB}
+	EndGlobalSection
+EndGlobal

MvvmCommunityApp/App.xaml

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+<Application x:Class="MvvmCommunityApp.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="clr-namespace:MvvmCommunityApp">
+    <Application.Resources>
+         
+    </Application.Resources>
+</Application>

MvvmCommunityApp/App.xaml.cs

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+using CommunityToolkit.Mvvm.DependencyInjection;
+using Microsoft.Extensions.DependencyInjection;
+using MvvmCommunityApp.interfaces;
+using MvvmCommunityApp.services;
+using MvvmCommunityApp.viewmodels;
+using System.Windows;
+
+namespace MvvmCommunityApp
+{
+    /// <summary>
+    /// Interaction logic for App.xaml
+    /// </summary>
+    public partial class App : Application
+    {
+        protected override void OnStartup(StartupEventArgs e)
+        {
+            base.OnStartup(e);
+
+            // setup mvvm ioc
+            Ioc.Default.ConfigureServices(
+                new ServiceCollection()
+                    .AddTransient<IocPageViewModel>()
+                    .AddSingleton<IDemoService, DemoService>()
+                    .BuildServiceProvider());
+
+            // load the main / entry page
+            MainWindow wnd = new MainWindow();
+
+            wnd.Title = "Something else";
+
+
+            wnd.Show();
+        }
+    }
+}

MvvmCommunityApp/AssemblyInfo.cs

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+using System.Windows;
+
+[assembly: ThemeInfo(
+    ResourceDictionaryLocation.None, //where theme specific resource dictionaries are located
+                                     //(used if a resource is not found in the page,
+                                     // or application resource dictionaries)
+    ResourceDictionaryLocation.SourceAssembly //where the generic resource dictionary is located
+                                              //(used if a resource is not found in the page,
+                                              // app, or any theme specific resource dictionaries)
+)]

MvvmCommunityApp/MainWindow.xaml

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+<Window x:Class="MvvmCommunityApp.MainWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        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:local="clr-namespace:MvvmCommunityApp"
+        mc:Ignorable="d"
+        Title="MainWindow" Height="450" Width="800">
+    <Grid>
+        <StackPanel>
+            <TextBlock Text="{Binding MyName}" />
+        </StackPanel>
+    </Grid>
+</Window>

MvvmCommunityApp/MainWindow.xaml.cs

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+using CommunityToolkit.Mvvm.DependencyInjection;
+using MvvmCommunityApp.viewmodels;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Navigation;
+using System.Windows.Shapes;
+
+namespace MvvmCommunityApp
+{
+    /// <summary>
+    /// Interaction logic for MainWindow.xaml
+    /// </summary>
+    public partial class MainWindow : Window
+    {
+        public MainWindow()
+        {
+
+            InitializeComponent();
+
+            DataContext = Ioc.Default.GetRequiredService<IocPageViewModel>();
+        }
+    }
+}

MvvmCommunityApp/MvvmCommunityApp.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net6.0-windows</TargetFramework>
+    <Nullable>enable</Nullable>
+    <UseWPF>true</UseWPF>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="CommunityToolkit.Mvvm" Version="8.1.0" />
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="7.0.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Folder Include="views\" />
+  </ItemGroup>
+
+</Project>

MvvmCommunityApp/interfaces/IDemoService.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace MvvmCommunityApp.interfaces
+{
+    public interface IDemoService
+    {
+        string Name { get; }
+
+        void Show(string name);
+    }
+}

MvvmCommunityApp/services/DemoService.cs

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+using MvvmCommunityApp.interfaces;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace MvvmCommunityApp.services
+{
+    public class DemoService : IDemoService
+    {
+        public string Name { get; set; }
+
+        public void Show(string name)
+        {
+            Console.WriteLine(name);
+        }
+    }
+}

MvvmCommunityApp/viewmodels/IocPageViewModel.cs

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+using MvvmCommunityApp.interfaces;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace MvvmCommunityApp.viewmodels
+{
+    public class IocPageViewModel : SamplePageViewModel
+    {
+        public string MyName { get; set; }
+        public IocPageViewModel(IDemoService demoService)
+            : base(demoService)
+        {
+            MyName = "Ioc";
+
+        }
+    }
+}

MvvmCommunityApp/viewmodels/SamplePageViewModel.cs

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+using CommunityToolkit.Mvvm.ComponentModel;
+using MvvmCommunityApp.interfaces;
+
+namespace MvvmCommunityApp.viewmodels
+{
+    public class SamplePageViewModel : ObservableObject
+    {
+        private readonly IDemoService _demoService;
+
+        public SamplePageViewModel(IDemoService demoService)
+        {
+            _demoService = demoService;
+        }
+    }
+}