Delphi实现DBGrid全选和反选功能

    Delphi实现Dbgrid全选和反选、清除全选的功能，不管是在Delphi下，还是在WEB开发中，这种功能都是很实用的，是进行数据批量操作的基础。本模块就是实现了为Delphi的DBGrid数据列表增加全选内容、清除全选的功能，很实用了，代码内容如下：

//全选
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;
//清除全选
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;
//反选
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;