Delphi2009之TStringBuilder类[1]:Create

Delphi 2009 之 TStringBuilder 类[1]: Create

unit Unit1;

interface

uses

  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,

  Dialogs, StdCtrls;

type

  TForm1 = class(TForm)

    Button1: TButton;

    Button2: TButton;

    procedure Button1Click(Sender: TObject);

    procedure Button2Click(Sender: TObject);

  end;

var

  Form1: TForm1;

implementation

{$R *.dfm}

//TStringBuilder.Create 可以无参数

procedure TForm1.Button1Click(Sender: TObject);

var

  sb: TStringBuilder;

begin

  sb := TStringBuilder.Create;

  sb.Append('Embarcadero');

  sb.Append(' CodeGear');

  sb.Append(' Delphi');

  sb.Append(' 2009');

  ShowMessage(sb.ToString); {Embarcadero CodeGear Delphi 2009}

  sb.Free;

end;

//TStringBuilder.Create 可用字符串初始化; 其他重载用处不大

procedure TForm1.Button2Click(Sender: TObject);

var

  sb: TStringBuilder;

begin

  sb := TStringBuilder.Create('Delphi ');

  sb.Append(2009);

  ShowMessage(sb.ToString); {Delphi 2009}

  sb.Free;

end;

end.