本例效果图:

代码文件:

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Memo1: TMemo;
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

{给 Memo 排序的函数}
procedure SortMemo(const m: TMemo);
begin
  with TStringList.Create do
  begin
    Sorted := True;
    Text := m.Text;
    m.Text := Text;
    Free;
  end;
end;

{测试}
procedure TForm1.FormCreate(Sender: TObject);
begin
  Memo1.Align := alLeft;
  Memo1.Lines.CommaText := ‘zzz,xxx,yyy,aaa,ccc,bbb,333,222,111‘;
  Button1.Caption := ‘排序‘;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  SortMemo(Memo1);
end;

end.

窗体文件:

object Form1: TForm1
  Left = 0
  Top = 0
  Caption = ‘Form1‘
  ClientHeight = 143
  ClientWidth = 166
  Color = clBtnFace
  Font.Charset = DEFAULT_CHARSET
  Font.Color = clWindowText
  Font.Height = -11
  Font.Name = ‘Tahoma‘
  Font.Style = []
  OldCreateOrder = False
  Position = poDesktopCenter
  OnCreate = FormCreate
  PixelsPerInch = 96
  TextHeight = 13
  object Memo1: TMemo
    Left = 0
    Top = 8
    Width = 73
    Height = 89
    Lines.Strings = (
      ‘Memo1‘)
    TabOrder = 0
  end
  object Button1: TButton
    Left = 79
    Top = 32
    Width = 75
    Height = 25
    Caption = ‘Button1‘
    TabOrder = 1
    OnClick = Button1Click
  end
end

给 Memo 排序的函数