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Frequently Asked Questions

Listbox selected property

Question:

When I try to set the selected property of a ListBox component, I receive an exception that the Index is out of bounds. How do I get around this?

Answer:

The selected property should only be used with ListBox 

components that have the MultiSelect property set to true. 

If you are working with a ListBox that has the MultiSelect 

property set to false, use the ItemIndex property to select 

the item.



Example:



procedure TForm1.Button1Click(Sender: TObject);

begin

  ListBox1.Items.Add('1');

  ListBox1.Items.Add('2');

{This will fail on a single selection ListBox}

//  ListBox1.Selected[1] := true;

  ListBox1.ItemIndex := 1; {This is ok}

end;



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