mvvm-community-demo/MvvmAppCore/ViewModels/SamplePageViewModel.cs

using CommunityToolkit.Mvvm.ComponentModel;
using MvvmAppCore.Interfaces;

namespace MvvmAppCore.ViewModels
{
    public class SamplePageViewModel : ObservableObject
    {
        private readonly IDemoService _demoService;

        public SamplePageViewModel(IDemoService demoService)
        {
            _demoService = demoService;
        }
    }
}