public void Redo()
{
if (_changes.Count == 0)
{
throw new ArgumentException("Cannot redo before any changes are tracked.");
}
if (_changes.Count > 0 && _lastChange != null && _lastChange.Equals(_changes.Last()))
{
throw new ArgumentException("Cannot redo before any changes are undone.");
}
Redo(_changes[_changes.IndexOf(_lastChange) + 1]);
}
private PropertyChange MoveLastChange(PropertyChange lastChange)
{
if (lastChange.Equals(_changes.First()))
{
_lastChange = null;
}
else
{
_lastChange = _changes[_changes.IndexOf(lastChange) - 1];
}
return(_lastChange);
}
private PropertyChange Redo(IDbEntity e, PropertyChange lastChange)
{
if (!lastChange.IsOrphan(e) ||
(lastChange.IsDbEntityEnumerable && lastChange.After != null && lastChange.Before == null))
{
lastChange.Apply(e);
}
_lastChange = lastChange;
PropertyChange nextChange = null;
if (!_lastChange.Equals(_changes.Last()))
{
nextChange = _changes[_changes.IndexOf(_lastChange) + 1];
}
return(nextChange);
}