BinaryWriter example in C# to store notes (6)

Question

Код для Form1.cs

using System.Text.Json;
using System.Xml.Linq;

namespace AnyaTask6
{
    public partial class Form1 : Form
    {
        private List<Note> notes = new();
        private string filePath = "notes.txt";
        private System.Windows.Forms.Timer checkTimer;

        public Form1()
        {
            InitializeComponent();
            LoadNotes();
            UpdateList();
            StartClock();
        }

        private void LoadNotes()
        {
            if (!File.Exists(filePath)) return;

            string[] lines = File.ReadAllLines(filePath);
            List<Note> loadedNotes = new List<Note>();
            foreach (string line in lines)
            {
                string[] med = line.Split("-", StringSplitOptions.TrimEntries);
                Note me = new Note();
                me.Time = DateTime.Parse(med[0]);
                me.Text = med[1];
                loadedNotes.Add(me);
            }

            var now = DateTime.Now;

            foreach (var note in loadedNotes)
            {
                if (note.Time > now)
                    notes.Add(note);
                else if (note.Time <= now)
                    ShowAndRemovePastNote(note);
            }
        }

        private void ShowAndRemovePastNote(Note note)
        {
            if (MessageBox.Show($"Задача просрочена {note.Time}:\n{note.Text}") == DialogResult.OK)
            {
                // Просто не добавляем в список
            }
        }

        private void SaveNotes()
        {
            List<Note> sorted = notes.OrderBy(n => n.Time).ToList();
            using (StreamWriter sw = new StreamWriter(filePath))
            {
                foreach (var note in sorted) {
                    sw.WriteLine(note);
                }
            }
            MessageBox.Show("Список сохранён");
        }

        private void UpdateList()
        {
            listBoxNotes.Items.Clear();
            foreach (var note in notes.OrderBy(n => n.Time))
                listBoxNotes.Items.Add(note);
        }

        private void StartClock()
        {
            checkTimer = new System.Windows.Forms.Timer();
            checkTimer.Interval = 5000;
            checkTimer.Tick += (s, e) =>
            {
                lblTime.Text = DateTime.Now.ToString();

                var expired = notes.Where(n => n.Time <= DateTime.Now).ToList();
                foreach (var note in expired)
                {
                    ShowAndRemovePastNote(note);
                    notes.Remove(note);
                }
                UpdateList();
            };
            checkTimer.Start();
        }

        private void btnAdd_Click(object sender, EventArgs e)
        {
            var time = dateTimePicker1.Value;
            var text = txtText.Text.Trim();
            if (string.IsNullOrWhiteSpace(text)) return;

            if (time <= DateTime.Now)
            {
                ShowAndRemovePastNote(new Note { Time = time, Text = text });
                return;
            }

            notes.Add(new Note { Time = time, Text = text });
            UpdateList();
        }

        private void btnDelete_Click(object sender, EventArgs e)
        {
            if (listBoxNotes.SelectedItem is Note selected)
            {
                notes.Remove(selected);
                UpdateList();
            }
        }

        private void btnEdit_Click(object sender, EventArgs e)
        {
            if (listBoxNotes.SelectedItem is Note selected)
            {
                var newTime = dateTimePicker1.Value;
                selected.Text = txtText.Text;
                selected.Time = newTime;
                UpdateList();
            }
        }

        private void btnSave_Click(object sender, EventArgs e)
        {
            SaveNotes();
        }
    }
}

Код для Form1.Designer.cs

namespace AnyaTask6
{
    partial class Form1
    {
        private System.ComponentModel.IContainer components = null;

        private Label lblTime;
        private TextBox txtText;
        private ListBox listBoxNotes;
        private Button btnAdd;
        private Button btnDelete;
        private Button btnEdit;
        private Button btnSave;
        private Label lblText;
        private Label lblDate;
        private Label lblNotes;

        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
                components.Dispose();
            base.Dispose(disposing);
        }

        private void InitializeComponent()
        {
            lblTime = new Label();
            txtText = new TextBox();
            listBoxNotes = new ListBox();
            btnAdd = new Button();
            btnDelete = new Button();
            btnEdit = new Button();
            btnSave = new Button();
            lblText = new Label();
            lblDate = new Label();
            lblNotes = new Label();
            dateTimePicker1 = new DateTimePicker();
            SuspendLayout();
            //
            // lblTime
            //
            lblTime.AutoSize = true;
            lblTime.Font = new Font("Segoe UI", 9F, FontStyle.Regular, GraphicsUnit.Point, 204);
            lblTime.Location = new Point(20, 15);
            lblTime.Name = "lblTime";
            lblTime.Size = new Size(115, 20);
            lblTime.TabIndex = 0;
            lblTime.Text = "Текущее время";
            //
            // txtText
            //
            txtText.Location = new Point(20, 70);
            txtText.Multiline = true;
            txtText.Name = "txtText";
            txtText.Size = new Size(430, 60);
            txtText.TabIndex = 2;
            //
            // listBoxNotes
            //
            listBoxNotes.FormattingEnabled = true;
            listBoxNotes.Location = new Point(20, 210);
            listBoxNotes.Name = "listBoxNotes";
            listBoxNotes.Size = new Size(430, 124);
            listBoxNotes.TabIndex = 7;
            //
            // btnAdd
            //
            btnAdd.Location = new Point(276, 160);
            btnAdd.Name = "btnAdd";
            btnAdd.Size = new Size(100, 30);
            btnAdd.TabIndex = 5;
            btnAdd.Text = "Добавить";
            btnAdd.Click += btnAdd_Click;
            //
            // btnDelete
            //
            btnDelete.Location = new Point(382, 160);
            btnDelete.Name = "btnDelete";
            btnDelete.Size = new Size(100, 30);
            btnDelete.TabIndex = 6;
            btnDelete.Text = "Удалить";
            btnDelete.Click += btnDelete_Click;
            //
            // btnEdit
            //
            btnEdit.Location = new Point(20, 360);
            btnEdit.Name = "btnEdit";
            btnEdit.Size = new Size(167, 30);
            btnEdit.TabIndex = 9;
            btnEdit.Text = "Редактировать";
            btnEdit.Click += btnEdit_Click;
            //
            // btnSave
            //
            btnSave.Location = new Point(193, 360);
            btnSave.Name = "btnSave";
            btnSave.Size = new Size(100, 30);
            btnSave.TabIndex = 10;
            btnSave.Text = "Сохранить";
            btnSave.Click += btnSave_Click;
            //
            // lblText
            //
            lblText.AutoSize = true;
            lblText.Location = new Point(20, 50);
            lblText.Name = "lblText";
            lblText.Size = new Size(45, 20);
            lblText.TabIndex = 1;
            lblText.Text = "Текст";
            //
            // lblDate
            //
            lblDate.AutoSize = true;
            lblDate.Location = new Point(20, 140);
            lblDate.Name = "lblDate";
            lblDate.Size = new Size(102, 20);
            lblDate.TabIndex = 3;
            lblDate.Text = "Дата и время";
            //
            // lblNotes
            //
            lblNotes.AutoSize = true;
            lblNotes.Location = new Point(20, 190);
            lblNotes.Name = "lblNotes";
            lblNotes.Size = new Size(147, 20);
            lblNotes.TabIndex = 8;
            lblNotes.Text = "Список сообщений:";
            //
            // dateTimePicker1
            //
            dateTimePicker1.Location = new Point(20, 163);
            dateTimePicker1.Name = "dateTimePicker1";
            dateTimePicker1.Size = new Size(250, 27);
            dateTimePicker1.TabIndex = 11;
            //
            // Form1
            //
            ClientSize = new Size(560, 400);
            Controls.Add(dateTimePicker1);
            Controls.Add(lblTime);
            Controls.Add(lblText);
            Controls.Add(txtText);
            Controls.Add(lblDate);
            Controls.Add(btnAdd);
            Controls.Add(btnDelete);
            Controls.Add(listBoxNotes);
            Controls.Add(lblNotes);
            Controls.Add(btnEdit);
            Controls.Add(btnSave);
            FormBorderStyle = FormBorderStyle.FixedDialog;
            MaximizeBox = false;
            Name = "Form1";
            Text = "Записная книжка";
            ResumeLayout(false);
            PerformLayout();
        }
        private DateTimePicker dateTimePicker1;
    }
}

Код для Note.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace AnyaTask6
{
    public class Note
    {
        public DateTime Time { get; set; }
        public string Text { get; set; }

        public override string ToString()
        {
            return $"{Time} - {Text}";
        }
    }

}