private static void DoFixup(IEnumerable <INavigation> navigations, InternalEntityEntry principalEntry, InternalEntityEntry[] dependentEntries)
{
foreach (var navigation in navigations)
{
if (navigation.IsDependentToPrincipal())
{
var setter = navigation.GetSetter();
foreach (var dependent in dependentEntries)
{
setter.SetClrValue(dependent.Entity, principalEntry.Entity);
dependent.SetRelationshipSnapshotValue(navigation, principalEntry.Entity);
}
}
else
{
if (navigation.IsCollection())
{
var collectionAccessor = navigation.GetCollectionAccessor();
foreach (var dependent in dependentEntries)
{
var dependentEntity = dependent.Entity;
if (!collectionAccessor.Contains(principalEntry.Entity, dependentEntity))
{
collectionAccessor.Add(principalEntry.Entity, dependentEntity);
principalEntry.AddToCollectionSnapshot(navigation, dependentEntity);
}
}
}
else
{
// TODO: Decide how to handle case where multiple values match non-collection nav prop
// Issue #739
var value = dependentEntries.Single().Entity;
navigation.GetSetter().SetClrValue(principalEntry.Entity, value);
principalEntry.SetRelationshipSnapshotValue(navigation, value);
}
}
}
}
private void DetectNavigationChange(InternalEntityEntry entry, INavigation navigation)
{
var snapshotValue = entry.GetRelationshipSnapshotValue(navigation);
var currentValue = entry[navigation];
var stateManager = entry.StateManager;
var added = new HashSet <object>(ReferenceEqualityComparer.Instance);
if (navigation.IsCollection())
{
var snapshotCollection = (IEnumerable)snapshotValue;
var currentCollection = (IEnumerable)currentValue;
var removed = new HashSet <object>(ReferenceEqualityComparer.Instance);
if (snapshotCollection != null)
{
foreach (var entity in snapshotCollection)
{
removed.Add(entity);
}
}
if (currentCollection != null)
{
foreach (var entity in currentCollection)
{
if (!removed.Remove(entity))
{
added.Add(entity);
}
}
}
if (added.Any() ||
removed.Any())
{
stateManager.Notify.NavigationCollectionChanged(entry, navigation, added, removed);
foreach (var addedEntity in added)
{
entry.AddToCollectionSnapshot(navigation, addedEntity);
}
foreach (var removedEntity in removed)
{
entry.RemoveFromCollectionSnapshot(navigation, removedEntity);
}
}
}
else if (!ReferenceEquals(currentValue, snapshotValue))
{
stateManager.Notify.NavigationReferenceChanged(entry, navigation, snapshotValue, currentValue);
if (currentValue != null)
{
added.Add(currentValue);
}
entry.SetRelationshipSnapshotValue(navigation, currentValue);
}
foreach (var addedEntity in added)
{
var addedEntry = stateManager.GetOrCreateEntry(addedEntity);
if (addedEntry.EntityState == EntityState.Detached)
{
_attacher.AttachGraph(addedEntry, EntityState.Added);
}
}
}
