/App.xaml.cs

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Threading.Tasks;
using System.Windows;
using Login.ViewModel;
using System.ComponentModel.Composition;
using System.ComponentModel.Composition.Hosting;
using Login.Helpers;
using System.Reflection;
using Login.Controllers;

namespace Login
{
    /// <summary>
    /// Interaction logic for App.xaml
    /// </summary>
    public partial class App : Application
    {
        private AggregateCatalog catalog_;
        private CompositionContainer container_;
        private IEnumerable<IModuleController> moduleControllers_;

        protected override void OnStartup ( StartupEventArgs e )
        {
            base.OnStartup(e);
            catalog_ = new AggregateCatalog( );
            catalog_.Catalogs.Add(new AssemblyCatalog(typeof(Controller).Assembly));

            container_ = new CompositionContainer(catalog_);
            CompositionBatch batch = new CompositionBatch( );
            batch.AddExportedValue(container_);
            container_.Compose(batch);
            moduleControllers_ = container_.GetExportedValues<IModuleController>( );
            foreach ( var moduleController in moduleControllers_ ) { moduleController.Initialize( ); }
            foreach ( var moduleController in moduleControllers_ ) { moduleController.Run( ); }

        }

    }
}