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Avoid duplicate items in string lists

 

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The following code shows how to use the property Duplicates to avoid duplicate items in string lists:

var
  sl : TStringList;
begin
  sl := TStringList.Create;
  with sl do
  begin
    Sorted     := True;
    Duplicates := dupIgnore;

    //
    // add your items here
    // all the duplicate items
    // will be ignored
    //
    Add(Input1.text);
  end;

  //
  // now you can assign the
  // string list with unique
  // items to listbox1 (example)
  //
  ListBox1.Items.Assign(sl);
  sl.Free;
end;
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