测试 Components 与 Controls 的区别（嵌套在Panel上的Edit，依然是Form1的Component）

本例效果图:

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代码文件:

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unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Panel1: TPanel;
    Edit1: TEdit;
    Button1: TButton;
    Memo1: TMemo;
    procedure Button1Click(Sender: TObject);
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
  i: Integer;
begin
  Memo1.Clear;

  Memo1.Lines.Add('窗体所属的 Components:');
  for i := 0 to Self.ComponentCount - 1 do
    Memo1.Lines.Add(Components[i].Name);

  Memo1.Lines.Add('');
  Memo1.Lines.Add('窗体所属的 Controls:');
  for i := 0 to Self.ControlCount - 1 do
    Memo1.Lines.Add(Controls[i].Name);
end;

end.

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窗体文件:

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object Form1: TForm1
  Left = 0
  Top = 0
  Caption = 'Form1'
  ClientHeight = 175
  ClientWidth = 339
  Color = clBtnFace
  Font.Charset = DEFAULT_CHARSET
  Font.Color = clWindowText
  Font.Height = -11
  Font.Name = 'Tahoma'
  Font.Style = []
  OldCreateOrder = False
  PixelsPerInch = 96
  TextHeight = 13
  object Panel1: TPanel
    Left = 194
    Top = 8
    Width = 137
    Height = 113
    Caption = 'Panel1'
    TabOrder = 0
    object Edit1: TEdit
      Left = 16
      Top = 11
      Width = 81
      Height = 21
      TabOrder = 0
      Text = 'Edit1'
    end
  end
  object Button1: TButton
    Left = 224
    Top = 136
    Width = 75
    Height = 25
    Caption = 'Button1'
    TabOrder = 1
    OnClick = Button1Click
  end
  object Memo1: TMemo
    Left = 0
    Top = 0
    Width = 185
    Height = 175
    Align = alLeft
    Lines.Strings = (
      'Memo1')
    TabOrder = 2
    ExplicitHeight = 192
  end
end

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http://www.cnblogs.com/del/archive/2008/10/23/1317862.html