TClientDataSet的 AddIndex

unit Unit2;
 
interface
 
uses
  SysUtils, Classes, DB, DBClient;
 
type
  TDataModule2 = class(TDataModule)
    ClientDataSet1: TClientDataSet;
    DataSource1: TDataSource;
    procedure DataModuleCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
 
var
  DataModule2: TDataModule2;
 
implementation
 
uses
  Dialogs;
 
{$R *.dfm}
 
procedure TDataModule2.DataModuleCreate(Sender: TObject);
begin
  with DataModule2.ClientDataSet1 do
  begin
    FileName := 'test.cds';
    with TStringField.Create(DataModule2.ClientDataSet1) do
    begin
      FieldName := 'test';
      Name := 'ClientDataSet1test';
      DataSet := DataModule2.ClientDataSet1;
    end;
    CreateDataSet;
    with IndexDefs.AddIndexDef do //或者在设计时
    begin
      Name := 'Indextest';
      Fields := 'test';
      Options := [ixDescending];
    end;
//    AddIndex('IndexTest', 'test', []); 不能用这个，否则下面一句 报 

---------------------------
Project1
---------------------------
ClientDataSet1: Index 'Indextest' not found.
---------------------------
确定
---------------------------

    IndexName := 'Indextest';
 
    if FileExists('test.cds') then
      LoadFromFile('test.cds')
  end;
end;
 
end.

unit Unit1;
 
interface
 
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, DB, DBClient, Grids, DBGrids;
 
type
  TForm1 = class(TForm)
    Button1: TButton;
    DBGrid1: TDBGrid;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
 
var
  Form1: TForm1;
 
implementation
 
uses
  Unit2;
 
{$R *.dfm}
 
procedure TForm1.Button1Click(Sender: TObject);
begin
  with DataModule2.ClientDataSet1 do
  begin
    Append;
    FieldByName('test').AsString := 'test1';
    Post;
  end;
end;
 
end.

program Project1;
 
uses
  Forms,
  Unit1 in 'Unit1.pas' {Form1},
  Unit2 in 'Unit2.pas' {DataModule2: TDataModule};
 
{$R *.res}
 
begin
  Application.Initialize;
  Application.MainFormOnTaskbar := True;
  Application.CreateForm(TDataModule2, DataModule2);
  Application.CreateForm(TForm1, Form1);
  Application.Run;
end.