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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:

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

    // add your items here
    // all the duplicate items
    // will be ignored

  // now you can assign the
  // string list with unique
  // items to listbox1 (example)
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