PIbd-32_Turner_I.A._COP_10/COP/VisualCompLib/MyDropDownList.cs

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

namespace VisualCompLib
{
	public partial class MyDropDownList : UserControl
	{
		public MyDropDownList()
		{
			InitializeComponent();
		}

		public void LoadValues(List<string> Values)
		{
			if (Values.Count == 0)
			{
				return;
			}
			dropDownList.Items.AddRange(Values.ToArray());
		}
		public void Clear()
		{
			dropDownList.Items.Clear();
		}

		public string SelectedValue
		{
			get
			{
				if (dropDownList.Items.Count == 0)
				{
					return "";
				}
				if (dropDownList.SelectedItem == null)
				{
					return "";
				}
				return dropDownList.SelectedItem.ToString();
			}
			set
			{
				if (dropDownList.Items.Contains(value))
				{
					dropDownList.SelectedItem = value;
				}
			}
		}

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

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