Kansan/KanSan/App.xaml.cs

using KanSan.ViewModel;
using Microsoft.Extensions.DependencyInjection;
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;

namespace KanSan
{
    /// <summary>
    /// Interaction logic for App.xaml
    /// </summary>
    public partial class App : Application
    {
        public App()
        {
            Syncfusion.Licensing.SyncfusionLicenseProvider.RegisterLicense("MjM0MjUzQDMxMzgyZTMxMmUzMG8wTDNQcm5mN3UxaU9MbjdkVUlQbDgzWHcvUXZCOHdaVVY3c2I5S3BvN0U9");
           
            
        }

        public static IServiceProvider ServiceProvider { get; private set; }

        protected override void OnStartup(StartupEventArgs e)
        {
            FrameworkElement.StyleProperty.OverrideMetadata(typeof(Window), new FrameworkPropertyMetadata
            {
                DefaultValue = FindResource(typeof(Window))
            });

            FrameworkElement.StyleProperty.OverrideMetadata(typeof(UserControl), new FrameworkPropertyMetadata
            {
                DefaultValue = FindResource(typeof(UserControl))
            });

            ServiceProvider = CreateServiceProvider();

            Window window = ServiceProvider.GetRequiredService<MainWindow>();
            window.Show();
            base.OnStartup(e);
        }

        private IServiceProvider CreateServiceProvider()
        {
            IServiceCollection services = new ServiceCollection();
            services.AddSingleton<SewerMainWindowViewModel>();
            
            services.AddScoped<MainWindowViewModel>();
            services.AddScoped<MainWindow>(s => new MainWindow(s.GetRequiredService<MainWindowViewModel>()));

            return services.BuildServiceProvider();
        }

    }
}