Zhelovanov_Dmitrii_COP/KOP_Labs/BooksForm.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace KOP_Labs
{
	public partial class BooksForm : UserControl
	{
		public BooksForm()
		{
			InitializeComponent();
		}

		public string? SelectedValue
		{
			get
			{
				if (listBoxComponent.SelectedItem == null)
				{
					return null;
				}
				return listBoxComponent.SelectedItem.ToString()!;
			}
			set
			{
				if (value != null && !listBoxComponent.Items.Contains(value))
				{
					return;
				}
				listBoxComponent.SelectedItem = value;
			}
		}

		private event EventHandler? _selectChanged;

		public event EventHandler SelectChanged
		{
			add { _selectChanged += value; }
			remove { _selectChanged -= value; }
		}

		public void FillValues(string values)
		{
			if (values == null || values.Length == 0)
			{
				return;
			}
			listBoxComponent.Items.Add(values);
		}



		public void ClearList()
		{
			listBoxComponent.Items.Clear();
		}

		private void listBoxComponent_SelectedIndexChanged(object sender, EventArgs e)
		{
			_selectChanged?.Invoke(this, e);
		}
	}
}