Finansai.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfApplication1
{
    public class Finansas
    {
       public int kiek;
       public string uz_ka;

        public Finansas(int kiek, string uz_ka)
        {
            this.kiek = kiek;  // "this" reiskia dabartini objekta
            this.uz_ka = uz_ka;
        }

        public override string ToString()
        {
            return uz_ka + ": " + kiek;
        }
    }
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        // Prideti finansa (Create)
        private void button_Click(object sender, RoutedEventArgs e)
        {
            // paimam duomenis is laukeliu
            string uz_ka = tb_uz_ka.Text;
            int kiek = Convert.ToInt32(tb_kiek.Text);

            // sukuriam objekta
            Finansas fin = new Finansas(kiek, uz_ka);  // Create 
            // idedam i sarasa
            listBox.Items.Add( fin );  // bus Read

            skaiciuoti_balansa();
        }

        void skaiciuoti_balansa()
        {
            // susumuojam balansa
            int suma = 0;
            foreach (Finansas f in listBox.Items)
            {
                suma += f.kiek;  // reik, kad "kiek" butu "public"
            }
            label.Content = suma;
        }

        // pasirinkti is saraso (Read)
        private void listBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            // pradzioj patikrinam, jei nieko nepazymeta
            if (listBox.SelectedItem == null) return; // nieko nedarom

            Finansas fin = (Finansas) listBox.SelectedItem;
            tb_kiek.Text = fin.kiek.ToString();  // skaiciu paverciam tekstu
            tb_uz_ka.Text = fin.uz_ka;
        }

        // atnaujinti (Update)
        private void button1_Click(object sender, RoutedEventArgs e)
        {
            // paimam duomenis is laukeliu
            string uz_ka = tb_uz_ka.Text;
            int kiek = Convert.ToInt32(tb_kiek.Text);

            // paimam dabartini elementa, ir atnaujinam jam reiksmes
            Finansas fin = (Finansas)listBox.SelectedItem;
            fin.uz_ka = uz_ka;
            fin.kiek = kiek;

            listBox.Items.Refresh();  // atsviezinam vaizda
            skaiciuoti_balansa();
        }

        // istrinti (Delete)
        private void button2_Click(object sender, RoutedEventArgs e)
        {
            listBox.Items.Remove(listBox.SelectedItem); // pasalinam pazymeta elementa
            // galima ir pagal numeri: listBox.Items.RemoveAt(listBox.SelectedIndex);
            listBox.Items.Refresh();
            skaiciuoti_balansa();
        }
    }
}