PIbd-31_Malafeev.L.S._COP_25/Cop_25/Controls/CustomComboBox.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 Controls
{
    public partial class CustomComboBox : UserControl
    {
        /// <summary>
        /// Конструктор
        /// </summary>
        public CustomComboBox()
        {
            InitializeComponent();
        }

        /// <summary>
        /// Очищение списка
        /// </summary>
        public void ComboBoxClear()
        {
            comboBoxMain.Items.Clear();
            comboBoxMain.SelectedItem = null;
        }

        /// <summary>
        /// Выбранный элемент
        /// </summary>
        public string SelectedItem
        {
            get
            {
                if (comboBoxMain.Items.Count == 0)
                {
                    return " ";
                }
                if (comboBoxMain.SelectedItem == null)
                {
                    return " ";
                }
                return comboBoxMain.SelectedItem.ToString()!;
            }
            set
            {
                if (comboBoxMain.Items.Contains(value))
                {
                    comboBoxMain.SelectedItem = value;
                }

            }
        }

        /// <summary>
        /// Публичное свойство
        /// </summary>
        public ComboBox.ObjectCollection ComboBoxItems
        {
            get { return comboBoxMain.Items; }
        }

        /// <summary>
        /// Событие, вызываемое при смене значения
        /// </summary>
        private EventHandler _onValueChangedEvent;

        /// <summary>
        /// Событие, вызываемое при смене значения
        /// </summary>
        public event EventHandler ValueChanged
        {
            add
            {
                _onValueChangedEvent += value;
            }

            remove
            {
                _onValueChangedEvent -= value;
            }
        }
        /// <summary>
        /// Смена значения
        /// </summary>
        private void CustomComboBox_SelectedValueChanged(object sender, EventArgs e)
        {
            _onValueChangedEvent?.Invoke(sender, e);
        }
    }
}