详测 Generics Collections TList (2): First、Last、IndexOf、LastIndexOf

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

uses Generics.Collections;

procedure TForm1.Button1Click(Sender: TObject);
var
  List: TList<string>;
begin
  List := TList<string>.Create();
  List.Add('AA');
  List.Add('BB');
  List.Add('CC');
  List.Add('BB');
  List.Add('DD');

  ShowMessageFmt('First: %s', [List.First]); {First: AA}

  ShowMessageFmt('Last: %s', [List.Last]); {Last: DD}

  ShowMessageFmt('IndexOf: %d', [List.IndexOf('BB')]); {IndexOf: 1}

  ShowMessageFmt('LastIndexOf: %d', [List.LastIndexOf('BB')]); {LastIndexOf: 3}

  List.Free;
end;

end.