/// <inheritdoc />
public virtual void Rollback()
{
lock (_sync)
{
_deletedEntities.Clear();
foreach (var entity in _entityCache)
{
lock (entity.Value.SynchronizationContext)
{
if (!entity.Value.IsChanged)
{
continue;
}
var valuesToSet = new List <MulticastPropertyValue>();
foreach (var currentPropertyValue in entity.Value.PropertyValues)
{
MulticastPropertyValue valueToSet = null;
var originalValue = entity.Value.OriginalValues.FindMatching(currentPropertyValue);
if (originalValue != null)
{
entity.Value.OriginalValues.Remove(originalValue);
if (originalValue.Value != null)
{
valueToSet = originalValue;
}
}
if (valueToSet == null)
{
valueToSet = new MulticastPropertyValue(currentPropertyValue.CastedType, currentPropertyValue.Property, null);
}
valuesToSet.Add(valueToSet);
}
foreach (var propertyValue in valuesToSet.Concat(entity.Value.OriginalValues))
{
entity.Value.SetPropertyInternal(propertyValue.Property, propertyValue.Value);
}
entity.Value.IsInitialized = true;
}
}
}
}
private void OnCollectionChanged(object sender, NotifyCollectionChangedEventArgs e, MulticastPropertyValue propertyValue)
{
var originalValue = (IList)typeof(ObservableList <>).MakeGenericType(propertyValue.Value.GetType().GetGenericArguments()[0])
.GetConstructor(Type.EmptyTypes).Invoke(null);
if (e.Action == NotifyCollectionChangedAction.Remove)
{
foreach (var removed in e.OldItems)
{
originalValue.Add(removed);
}
}
foreach (var item in (IEnumerable)propertyValue.Value)
{
if (((e.Action == NotifyCollectionChangedAction.Remove) && (e.OldItems.Contains(item))) ||
(e.Action == NotifyCollectionChangedAction.Add))
{
continue;
}
originalValue.Add(item);
}
OriginalValues.Remove(propertyValue);
OriginalValues.Add(new MulticastPropertyValue(propertyValue.CastedType, propertyValue.Property, originalValue));
((IObservableCollection)sender).ClearCollectionChanged();
}
internal static MulticastPropertyValue FindMatching(this IEnumerable <MulticastPropertyValue> propertyValues, MulticastPropertyValue actualPropertyValue)
{
return(propertyValues.FirstOrDefault(propertyValue => (propertyValue.Property == actualPropertyValue.Property) &&
(propertyValue.CastedType == actualPropertyValue.CastedType)));
}
