Auto Complete ComboBox
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
public class Form1 : System.Windows.Forms.Form
{
private AutoCompleteComboBox combo;
public Form1()
{
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(292, 273);
combo = new AutoCompleteComboBox();
combo.Location = new System.Drawing.Point(64, 32);
combo.Size = new System.Drawing.Size(150, 20);
combo.Items.Add("Aaaaaa");
combo.Items.Add("Bbbbbbbbb");
combo.Items.Add("Ccccccccccc");
Controls.Add(combo);
CenterToScreen();
}
static void Main()
{
Application.Run(new Form1());
}
}
public class AutoCompleteComboBox : System.Windows.Forms.ComboBox
{
public event System.ComponentModel.CancelEventHandler NotInList;
private bool strict = true;
private bool isEditing = false;
public AutoCompleteComboBox() : base() {
}
public bool Strict
{
get { return strict; }
set { strict = value; }
}
protected virtual void OnNotInList(System.ComponentModel.CancelEventArgs e)
{
if (NotInList != null)
{
NotInList(this, e);
}
}
protected override void OnTextChanged(System.EventArgs e)
{
if (isEditing)
{
string input = Text;
int index = this.FindString(input);
if (index >= 0)
{
isEditing = false;
SelectedIndex = index;
isEditing = true;
Select(input.Length, Text.Length);
}
}
base.OnTextChanged(e);
}
protected override void OnValidating(System.ComponentModel.CancelEventArgs e)
{
if (this.Strict)
{
int pos = this.FindStringExact(this.Text);
if (pos == -1)
{
OnNotInList(e);
}
else
{
this.SelectedIndex = pos;
}
}
base.OnValidating(e);
}
protected override void OnKeyDown(System.Windows.Forms.KeyEventArgs e)
{
isEditing = (e.KeyCode != Keys.Back && e.KeyCode != Keys.Delete);
base.OnKeyDown(e);
}
}
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