Question

Delphi如何判断Tstringlist是否已create

Answer 1

unit Unit1;

interface

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

type
TForm1 = class(TForm)
Memo1: TMemo;
Memo2: TMemo;
Button1: TButton;
procedure FormCreate(Sender: TObject);
procedure FormDestroy(Sender: TObject);
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
SrsList,DestList1,DestList2: TStringList;
end;

var
Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
SrsList:=TStringList.Create;
SrsList.Add('a');
SrsList.Add('b');
SrsList.Add('*');
SrsList.Add('c');
SrsList.Add('d');
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
SrsList.Free;
end;