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); } } }