SUBD_Aleikin/WinFormsProject/WinFormsLibrary/CustomCheckedListBox.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;
using static System.Windows.Forms.VisualStyles.VisualStyleElement;

namespace WinFormsLibrary
{
    public partial class CustomCheckedListBox : UserControl
    {
        public CustomCheckedListBox()
        {
            InitializeComponent();
        }

        //метод для очистки
        public void Clear()
        {
            checkedListBox.Items.Clear();
        }

        //метод для заполнения
        public void FillCheckedListBox(List<string> items)
        {
            checkedListBox.Items.Clear();
            checkedListBox.Items.AddRange(items.ToArray());
        }

        //публичное свойство
        public string Selected
        {
            get
            {
                if (checkedListBox.SelectedItems.Count == 0)
                {
                    return "";
                }
                string result = "";
                foreach (object itemChecked in checkedListBox.CheckedItems)
                {
                    result += itemChecked.ToString() + Environment.NewLine;
                }
                return result;
            }
            set
            {
                if (checkedListBox.Items.Contains(value))
                {
                    checkedListBox.SelectedItem = value;
                }

            }
        }

        private EventHandler onValueChanged;
        public event EventHandler ValueChanged
        {
            add
            {
                onValueChanged += value;
            }
            remove
            {
                onValueChanged -= value;
            }
        }

        private void checkedListBox_SelectedValueChanged(object sender, EventArgs e)
        {
            onValueChanged?.Invoke(sender, e);
        }
    }
}