bbwy/PJZS/ViewModels/ViewModelLocator.cs

using Microsoft.Extensions.DependencyInjection;
using System;

namespace PJZS.ViewModels
{
    public class ViewModelLocator
    {
        private IServiceProvider sp;

        public ViewModelLocator()
        {
            sp = (App.Current as App).ServiceProvider;
        }

        public MainViewModel Main
        {
            get
            {
                using (var s = sp.CreateScope())
                {
                    return s.ServiceProvider.GetRequiredService<MainViewModel>();
                }
            }
        }
    }
}