C# WPF Microsoft DI structure change

<UserControl x:Class="SamplePlugin.Configuration.MainPageConfigurationUserControl"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             xmlns:mainPage="clr-namespace:SamplePlugin.Configuration.MainPage"
             mc:Ignorable="d"
             d:DesignHeight="600" d:DesignWidth="300" d:Background="White">
    <d:UserControl.DataContext>
        <mainPage:MainPageViewmodel/>
    </d:UserControl.DataContext>
    <Grid>
        <StackPanel >
            <Button x:Name="TestDialogButton" Command="{Binding TestDialogServerCommand}">Test dialog service</Button>
        </StackPanel>
        
    </Grid>
</UserControl>

using System.Windows.Input;
using CommunityToolkit.Mvvm.ComponentModel;

namespace SamplePlugin.Configuration.MainPage;

public partial class MainPageViewmodel : ObservableObject
{
    public ICommand TestDialogServerCommand { get; set; } = null!;
}

using System.Data;
using System.Diagnostics;
using System.Windows.Controls;
using System.Windows.Media;
using Application;
using Application.Data;
using CommunityToolkit.Mvvm.Input;
using Microsoft.Extensions.DependencyInjection;
using SamplePlugin.Configuration;
using SamplePlugin.Configuration.MainPage;
using Serilog;

namespace SamplePlugin;

public class SamplePluginMainConfigurationPage
{
    // other code...

    private MainPageConfigurationUserControl userControl = null!;
    private readonly MainPageViewmodel viewmodel = new();
    private readonly IServiceProvider provider;

    public SamplePluginMainConfigurationPage(IServiceProvider provider)
    {
        this.provider = provider;
        // This could also be AsyncRelayCommand
        viewmodel.TestDialogServerCommand = new RelayCommand(ExecuteTestDialogServerCommand);
    }

    private void ExecuteTestDialogServerCommand()
    {
        var dialogService = provider.GetService<IDialogService>()!;
        dialogService.ShowMessageBox("Hello from SamplePluginMainConfigurationPage");
    }

    public UserControl GetUserControl()
    {
        return userControl;
    }
   
    // other code...
}