private ICommand Backward(XTable table, ICommand command)
{
BackwardCommand cmd = (BackwardCommand)command;
List <KeyValuePair <IData, IData> > list = new List <KeyValuePair <IData, IData> >();
foreach (var item in table.Backward(cmd.FromKey, cmd.FromKey != null, cmd.ToKey, cmd.ToKey != null).Take(cmd.PageCount))
{
list.Add(item);
}
return(new BackwardCommand(cmd.PageCount, cmd.FromKey, cmd.ToKey, list));
}
