lab1/WpfApp1/MainWindow.xaml.cs

using System.Collections.Generic;
using System.Windows;
using WpfApp1.Model;

namespace WpfApp1
{
    public partial class MainWindow : Window
    {
        public IEnumerable<Guitar> GuitarList { get; set; }

        public MainWindow()
        {
            InitializeComponent();
            DataContext = this;
            Globals.dataProvider = new LocalDataProvider();
            GuitarList = Globals.dataProvider.getGuitars();
        }

        private void ExitButton_Click(object sender, RoutedEventArgs e)
        {
            Application.Current.Shutdown();
        }
        class Globals
        {
            public static IDataProvider dataProvider;
        }
        interface IDataProvider
        {
            IEnumerable<Guitar> getGuitars();
        }

        public class LocalDataProvider : IDataProvider
        {
            public IEnumerable<Guitar> getGuitars()
            {
                return new Guitar[]
                {
                new Guitar
                {
                    Brand = "Fender",
                    Model = "Stratocaster",
                    Color = "Black",

                },
                new Guitar
                {
                    Brand = "Gibson",
                    Model = "Les Paul",
                    Color = "Sunburst",
                },
                new Guitar
                {
                    Brand = "Martin",
                    Model = "D-28",
                    Color = "Natural",
                }
                };
            }
        }
    }
}