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();
}
// Captures the original value for a property that is changing.
internal void RecordOriginalValue(string propertyName, object oldValue, object newValue)
{
if (IsChangeTrackingEnabled && _objectState != ObjectState.Added)
{
if (OriginalValues.ContainsKey(propertyName))
{
if (object.Equals(OriginalValues[propertyName], newValue))
{
OriginalValues.Remove(propertyName);
if (OriginalValues.Count == 0 && _objectState == ObjectState.Modified)
{
State = ObjectState.Unchanged;
ModifiedProperties.Clear();
}
else
{
ModifiedProperties.Remove(propertyName);
}
}
}
else
{
OriginalValues[propertyName] = oldValue;
}
}
}
// Captures the original value for a property that is changing.
internal void RecordValue(string propertyName, object oldValue, object newValue)
{
if (_changeTrackingEnabled && _objectState != ObjectState.Added)
{
if (OriginalValues.ContainsKey(propertyName) &&
OriginalValues[propertyName] == newValue)
{
// On repasse à l'état initial
OriginalValues.Remove(propertyName);
ModifiedValues.Remove(propertyName);
}
else
{
if (!OriginalValues.ContainsKey(propertyName))
{
OriginalValues[propertyName] = oldValue;
}
ModifiedValues[propertyName] = newValue;
}
}
}