private static void DetectKeyChange(InternalEntityEntry entry, IProperty property)
{
var keys = property.FindContainingKeys().ToList();
var foreignKeys = property.FindContainingForeignKeys().ToList();
if ((keys.Count > 0) ||
(foreignKeys.Count > 0))
{
var snapshotValue = entry.GetRelationshipSnapshotValue(property);
var currentValue = entry[property];
// Note that mutation of a byte[] key is not supported or detected, but two different instances
// of byte[] with the same content must be detected as equal.
if (!StructuralComparisons.StructuralEqualityComparer.Equals(currentValue, snapshotValue))
{
var stateManager = entry.StateManager;
if (foreignKeys.Count > 0)
{
stateManager.Notify.ForeignKeyPropertyChanged(entry, property, snapshotValue, currentValue);
foreach (var foreignKey in foreignKeys)
{
stateManager.UpdateDependentMap(entry, foreignKey);
}
}
if (keys.Count > 0)
{
foreach (var key in keys)
{
stateManager.UpdateIdentityMap(entry, key);
}
stateManager.Notify.PrincipalKeyPropertyChanged(entry, property, snapshotValue, currentValue);
}
entry.SetRelationshipSnapshotValue(property, currentValue);
}
}
}
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);
}
}
}