mvvm-community-demo/MvvmCommunityApp/viewmodels/SamplePageViewModel.cs

using CommunityToolkit.Mvvm.ComponentModel;
using MvvmCommunityApp.interfaces;

namespace MvvmCommunityApp.viewmodels
{
    public class SamplePageViewModel : ObservableObject
    {
        private readonly IDemoService _demoService;

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