lab1/WpfApp2/MainWindow.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows;
using System.Windows.Controls;

namespace WpfApp2
{
    public partial class MainWindow : Window
    {
        private List<MusicalInstrument> instruments;

        public MainWindow()
        {
            InitializeComponent();

            InitializeData();

            FilterComboBox.Items.Add("Все");
            FilterComboBox.Items.Add("Клавишные");
            FilterComboBox.Items.Add("Струнные");
            FilterComboBox.Items.Add("Ударные");
            FilterComboBox.SelectedIndex = 0;

            UpdateInstrumentList(instruments);
        }

        private void InitializeData()
        {
            instruments = new List<MusicalInstrument>
            {
                new MusicalInstrument { Name = "Гитара", Type = "Струнные", Price = 300 },
                new MusicalInstrument { Name = "Барабаны", Type = "Ударные", Price = 500 },
                new MusicalInstrument { Name = "Фортепиано", Type = "Клавишные", Price = 1000 },
                new MusicalInstrument { Name = "Скрипка", Type = "Струнные", Price = 400 },
                new MusicalInstrument { Name = "Труба", Type = "Медные", Price = 600 },
            };
        }

        private void FilterComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            string selectedFilter = (string)FilterComboBox.SelectedItem;
            List<MusicalInstrument> filteredInstruments = new List<MusicalInstrument>();

            switch (selectedFilter)
            {
                case "Все":
                    filteredInstruments = instruments;
                    break;
                case "Клавишные":
                    filteredInstruments = instruments.Where(i => i.Type == "Клавишные").ToList();
                    break;
                case "Струнные":
                    filteredInstruments = instruments.Where(i => i.Type == "Струнные").ToList();
                    break;
                case "Ударные":
                    filteredInstruments = instruments.Where(i => i.Type == "Ударные").ToList();
                    break;
            }

            UpdateInstrumentList(filteredInstruments);
        }

        private void UpdateInstrumentList(List<MusicalInstrument> instrumentsToDisplay)
        {
            InstrumentListView.ItemsSource = instrumentsToDisplay;
        }
    }

    class MusicalInstrument
    {
        public string Name { get; set; }
        public string Type { get; set; }
        public string Brand { get; set; }
        public double Price { get; set; }
    }
}