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What?s new in Delphi 2005 #1 ( for ?in loop statement) (ҹ 11,825)
Artist / syootakarn@hotmail.com 

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Delphi 2005 աö ҡ·㹵 IDE ͧǹͧѵª (add-in) Фö鹪ѡѲ дǡǴ觢 з¹¹ҹҹѹФѺ
ѹҴ٤(keyword) Delphi 8 ͤ for ?in loop Ѻ繡ûءʧǹ for in ҹ ͹鹡¹ Delphi ҵͧ for loop ҹҷ Array , List Array Pointer Ҩеͧҧ˹Թҧԧ֧˹觷ҵͧҶ֧ ֧Ҩ Iterator (ѵ·ҵẺ Array) Iterator 鹡ѧ繵ͧյ÷Թ ҧҧҧ繡Ҷ֧ Array

var
  i: Integer;
begin
  Memo1.Clear;
  for i:=0 to ListBox1.Items.Count-1 do
    Memo1.Lines.Add(ListBox1.Items[i]);

ҹѴ͡ŷ Listbox1 Memo1 ҡҵͧ괢ͧ˹觵 㹷˹觵 ҡբҴ˭ЫѺ͹ҡҹҨеͧҡ鹡ҹ ҨзسҹǼԴҴ ͧҡҵͧҺ˹شͧ˹ Array 蹵˹Ҩ ?0? ?1? ͵˹ չҴҧҧѹ

procedure TForm3.Button2Click(Sender: TObject);
var
  S: String;
begin
  Memo1.Clear;
  for S in ListBox1.Items do
    Memo1.Lines.Add(S);
end;

ҧ for S in ListBox1.Items do 繡 Delphi Compiler ӡ觾ͧ Index ѵѵҡ˹鹨ش֧˹ش( index ʴ繵͹¹) ҵͧҧǢ繪ԴǡѺ÷ҵͧ͹˹ index ҡҧê S Ẻ String ҡ鹹 for ?in loop ѹ Index 价 ListBox.Item 鹷˹ѵѵ (ҴѧҨҡ¡ѧ GetEnumerator) Фҷ S 繤ҷ Array ˹ index ҹ S for ?in loop 鹵ͧҹҢͧ S 繤ҷҹҧ (read only) ҡҧ¹ for-in loop 繴ѧ

procedure TForm3.Button4Click(Sender: TObject);

var
  i: Integer;
  
begin
  Memo1.Clear;
  for i:=0 to ListBox1.Items.Count-1 do
    Memo1.Lines.Add(ListBox1.Items[i]);
	
end;

Ҵٵҧ令Ѻ

procedure TForm3.Button2Click(Sender: TObject);

var
  S: String;
  C: Char;
  Spaces: Integer;

begin
  Spaces := 0;
  Memo1.Clear;
  for S in ListBox1.Items do
  begin
    Memo1.Lines.Add(S);
    for C in S do
      if C = ' ' then Inc(Spaces);
  end;

end;

ҧ繡ҹ for-in loop index 繵˹觵ѡ㹢ͤѺ ҴաҧФѺ

procedure TForm1.Button1Click(Sender: TObject);

var
  Comp: TComponent;

begin
  ListBox1.Clear;
  for Comp in Self do
    ListBox1.Items.Add(Comp.Name + ': ' + Comp.ClassName);

end;

ҧ繡ҹ for-in loop ҧԧ֧˹ Comp Self Ѻ Comp 繵ѵ TComponent ҧ֧Ҩҡ self TForm1 ͵ѵ TForm 繤ʰҹ µ this C++ ͵ ME Visual Basic ФѺ Ҵաҧ֧Ѻ

procedure TForm3.Button3Click(Sender: TObject);

var
  Comp: TComponent;

begin
  ListBox1.Clear;
  for Comp in Self do
  begin
    Comp.Tag := 42;
    if (Comp is TButton) then
      (Comp as TButton).Caption :=
        '<'+(Comp as TButton).Name+'>'; 
    ListBox1.Items.Add(Comp.Name + ': ' + Comp.ClassName);
  end;

end;

ҧʹҡ͹˹ҹ繡õǨͺҢͧ Comp for-in loop Ѻ ֧ѧ͹ФѺҤҢͧ Comp for-in loop 繤ҷҹҧ ö create() ҧѹҹѺ for-in loop

 

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