Вот простое текстовое поле автозаполнения, которое вы можете использовать для своих нужд:
class AutoSuggestControl : TextBox
{
List<string> Suggestions;
int PreviousLength;
public AutoSuggestControl() : base()
{
Suggestions = new List<string>();
// We keep track of the previous length of the string
// If the user tries to delete characters we do not interfere
PreviousLength = 0;
// Very basic list, too slow to be suitable for systems with many entries
foreach(var e in yourListbox.Items)
{
//add your listbox items to the textbox
}
Suggestions.Sort();
}
/// <summary>
/// Search through the collection of suggestions for a match
/// </summary>
/// <param name="Input"></param>
/// <returns></returns>
private string FindSuggestion(string Input)
{
if (Input != "")
foreach (string Suggestion in Suggestions)
{
if (Suggestion.StartsWith(Input))
return Suggestion;
}
return null;
}
/// <summary>
/// We only interfere after receiving the OnTextChanged event.
/// </summary>
/// <param name="e"></param>
protected override void OnTextChanged(EventArgs e)
{
base.OnTextChanged(e);
// We don't do anything if the user is trying to shorten the sentence
int CursorPosition = SelectionStart;
if (Text.Length > PreviousLength && CursorPosition >= 0)
{
string Suggestion = FindSuggestion(Text.Substring(0, CursorPosition));
if (Suggestion != null)
{
// Set the contents of the textbox to the suggestion
Text = Suggestion;
// Setting text puts the cursor at the beginning of the textbox, so we need to reposition it
Select(CursorPosition, 0);
}
}
PreviousLength = Text.Length;
}
}