private ICommand FindPrev(XTable table, ICommand command)
{
FindPrevCommand cmd = (FindPrevCommand)command;
KeyValuePair <IData, IData>?keyValue = table.FindPrev(cmd.Key);
return(new FindPrevCommand(cmd.Key, keyValue));
}
public KeyValuePair <IData, IData>?FindPrev(IData key)
{
var command = new FindPrevCommand(key);
Execute(command);
return(command.KeyValue);
}