public void Attach()
{
foreach (var dep in Dependencies)
{
dep.Successors.Set(this);
}
value = SL.SingleOrDefault(source);
}
private void SourceCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
if (e.Action == NotifyCollectionChangedAction.Reset ||
(e.OldItems != null && e.OldStartingIndex <= 0) ||
(e.NewItems != null && e.NewStartingIndex <= 0))
{
SetValue(SL.SingleOrDefault(source));
}
}
public INotificationResult Notify(IList <INotificationResult> sources)
{
var newValue = SL.SingleOrDefault(source);
if (!EqualityComparer <TSource> .Default.Equals(value, newValue))
{
var oldValue = value;
value = newValue;
OnValueChanged(new ValueChangedEventArgs(oldValue, newValue));
return(new ValueChangedNotificationResult <TSource>(this, oldValue, newValue));
}
return(UnchangedNotificationResult.Instance);
}