从delphi中的另一个表单刷新DBGrid

我刚刚开始学习德尔福,我遇到了一个问题.我将从另一种形式刷新DBGrid.我的代码：

Form1中：

unit uForm1;

interface

uses
  Windows,Messages,SysUtils,Variants,Classes,Graphics,Controls,Forms,Dialogs,DB,ADODB,Grids,DBGrids,StdCtrls;

type
  TForm1 = class(TForm)
    btnAdd: TButton;
    grid: TDBGrid;
    ADOQuery1: TADOQuery;
    DataSource1: TDataSource;
    procedure btnAdd(Sender: TObject);
  private
  public
       constructor Create(Owner:TComponent); overload;
  end;

var
  form1: TForm1;

implementation

uses uForm2,uDbOperations;

{$R *.dfm}

procedure TForm1.btnAddClick(Sender: TObject);
var
  frm : TForm2;
begin
  frm := TForm2.Create(form1);
  frm.ShowModal;
  frm.Free;
end;

窗体2：

unit uForm2;
procedure TForm2.btnAddClick(Sender: TObject);
var
  query : string;
begin
       query := 'Insert into Employees(Name) Values('''+txtName.Text+''');';
       DbOperations.InsertOrUpdate(query,ADOQuery1);
        ModalResult := mrCancel;
        //And this here I'd refresh grid on form1           
end;
end.

如何在form2中添加记录后,在form1中刷新dbgrid？我尝试了很多方法,但没有成功.我知道在C#中需要在构造函数中传递引用,但是delphi如何？

解决方法

使用你的模式,我会做这样的事情：

procedure TForm1.btnAddClick(Sender: TObject);
var
  frm : TForm2;
begin
  frm := TForm2.Create(form1);
  try
    if frm.ShowModal = mrOK then
    begin
      Grid.Datasource.Dataset.Refresh;
      // some databases require open/close to refresh
      // in this case Grid.Datasource.Dataset.close;
      //              Grid.Datasource.Dataset.Open;
    end;
  finally
    frm.Free;
  end
end;

procedure TForm2.btnAddClick(Sender: TObject);
var
  query : string;
begin
  query := 'Insert into Employees(Name) Values('''+txtName.Text+''');';
  DbOperations.InsertOrUpdate(query,ADOQuery1);
  ModalResult := mrOK;
  // let a cancel button on Form2 perform ModalResult = mrCancel  
  // to avoid unnecessary dataset refreshes..      
end;