Delphi實現DBGrid全選和反選功能

    Delphi實現Dbgrid全選和反選、清除全選的功能，不管是在Delphi下，還是在WEB開發中，這種功能都是很實用的，是進行數據批量操作的基礎。本模塊就是實現了為Delphi的DBGrid數據列表增加全選內容、清除全選的功能，很實用了，代碼內容如下：

//全選
procedure TFrameCustSelector.ToolButton1Click(Sender: TObject);
var
  OldCurrent: TBookmark;
begin
  OldCurrent := DBGrid1.DataSource.DataSet.Bookmark;
  DBGrid1.DataSource.DataSet.DisableControls;
  DBGrid1.DataSource.DataSet.First ;
  while not DBGrid1.DataSource.DataSet.Eof do begin
    DBGrid1.SelectedRows.CurrentRowSelected := true;
    DBGrid1.DataSource.DataSet.Next;
  end;
  DBGrid1.DataSource.DataSet.GotoBookmark(OldCurrent);
  DBGrid1.DataSource.DataSet.EnableControls;
end;
//清除全選
procedure TFrameCustSelector.ToolButton2Click(Sender: TObject);
var
  OldCurrent: TBookmark;
begin
  OldCurrent := DBGrid1.DataSource.DataSet.Bookmark;
  DBGrid1.DataSource.DataSet.DisableControls;
  DBGrid1.DataSource.DataSet.First ;
  while not DBGrid1.DataSource.DataSet.Eof do begin
    DBGrid1.SelectedRows.CurrentRowSelected := False;
    DBGrid1.DataSource.DataSet.Next;
  end;
  DBGrid1.DataSource.DataSet.GotoBookmark(OldCurrent);
  DBGrid1.DataSource.DataSet.EnableControls;
end;
//反選
procedure TFrameCustSelector.ToolButton3Click(Sender: TObject);
var
OldCurrent: TBookmark;
begin
  OldCurrent := DBGrid1.DataSource.DataSet.Bookmark;
  DBGrid1.DataSource.DataSet.DisableControls;
  DBGrid1.DataSource.DataSet.First ;
  while not DBGrid1.DataSource.DataSet.Eof do begin
    DBGrid1.SelectedRows.CurrentRowSelected := not DBGrid1.SelectedRows.CurrentRowSelected;
    DBGrid1.DataSource.DataSet.Next;
  end;
  DBGrid1.DataSource.DataSet.GotoBookmark(OldCurrent);
  DBGrid1.DataSource.DataSet.EnableControls;
end;