71 lines
1.1 KiB
C#
71 lines
1.1 KiB
C#
using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Data;
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using System.Drawing;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using System.Windows.Forms;
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namespace CustomComponents
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{
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public partial class DropDownList : UserControl
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{
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public DropDownList()
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{
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InitializeComponent();
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}
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public void AddToList(string value)// 1 zadanie
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{
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if (value == null)
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{
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return;
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}
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ComboBox.Items.Add(value);
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}
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public void ClearList()
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{
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ComboBox.Items.Clear();
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}
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private void ComboBox_SelectedIndexChanged(object sender, EventArgs e)
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{
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_changeEvent?.Invoke(sender, e);
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}
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public string? Selected
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{
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get
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{
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if (ComboBox.Items.Count == 0 || ComboBox.SelectedItem == null)
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{
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return "";
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}
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return ComboBox.SelectedItem.ToString()!;
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}
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set
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{
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if (ComboBox.Items.Contains(value))
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{
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ComboBox.SelectedItem = value;
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}
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}
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}
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private EventHandler _changeEvent;
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public event EventHandler ChangeEvent
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{
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add
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{
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_changeEvent += value;
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}
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remove
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{
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_changeEvent -= value;
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}
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}
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}
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}
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