private void RevertCollectionChange <T>(IEnumerable entities)
where T : class, IDbEntity
{
ICollection <T> collection = entities as ICollection <T>;
if (Before == null && After != null && DbEntityUtilities.IsIDbEntity(After.GetType()))
{
// This property change refers to a newly added entity to this collection. To revert it, remove the added entity from the collection
collection.Remove(After as T);
}
else if (Before != null && DbEntityUtilities.IsIDbEntity(Before.GetType()) && After == null && !collection.Contains(Before as T))
{
// This property change refers to an entity removed from this collection. To revert it, re-add the removed entity to the collection
collection.Add(Before as T);
}
}
private void ApplyCollectionChange <T>(IEnumerable entities)
where T : class, IDbEntity
{
// If remove (i.e. before = typeof(IDbEntity), after = null), remove before value
ICollection <T> collection = entities as ICollection <T>;
if (Before == null && After != null && DbEntityUtilities.IsIDbEntity(After.GetType()) && !collection.Contains(After as T))
{
// This property change refers to a newly added entity to this collection. To re-apply it, re-add the added entity to the collection
collection.Add(After as T);
}
else if (Before != null && DbEntityUtilities.IsIDbEntity(Before.GetType()) && After == null)
{
// This property change refers to an entity removed from this collection. To re-apply it, remove the removed entity from the collection
collection.Remove(Before as T);
}
}
private void EntityPropertyChanged(object sender, DbEntityPropertyChangedEventArgs e, string path)
{
IDbEntity entity = sender as IDbEntity;
PropertyChange change = null;
// Save a reference to the property changed
if (!_isCreatingHandlers && IsValid(sender.GetType(), path, e.PropertyName) && (!e.PropertyName.Equals("IsDeleted") || entity.State == EntityState.Persisted))
{
string propertyPath = path + e.PropertyName;
PropertyInfo p = entity.GetType().GetProperty(e.PropertyName);
bool isEnumerable = p.GetGetMethod().ReturnType.IsIEnumerable();
bool isDbEntityEnumerable = false;
bool isIDbEntity = DbEntityUtilities.IsIDbEntity(p);
if (isIDbEntity)
{
propertyPath = propertyPath + ".";
if (e.Before != null)
{
RemoveHandlers(e.Before as IDbEntity, propertyPath);
}
if (e.After != null)
{
// Defer any changes tracking that might have been recorded on the navigation entity to the root entity
IDbEntity navigationEntity = e.After as IDbEntity;
if (_entity.IsTrackingChanges)
{
MergeChanges(navigationEntity, propertyPath, !_entity.IsTrackingChanges);
}
CreateHandlers(navigationEntity, propertyPath);
}
}
else if ((isEnumerable && p.GetGetMethod().ReturnType.GetGenericArguments().Count() > 0 && DbEntityUtilities.IsIDbEntity(p.GetGetMethod().ReturnType.GetGenericArguments()[0])))
{
isDbEntityEnumerable = true;
if (e.Before != null)
{
RemoveCollectionHandlers(entity, e.Before as IEnumerable <IDbEntity>, path, propertyPath + ".", p);
}
if (e.After != null)
{
foreach (IDbEntity navigationEntity in e.After as IEnumerable <IDbEntity> )
{
if (navigationEntity != null)
{
string entityPath = DbEntityUtilities.GenerateCollectionItemPath(propertyPath, navigationEntity.Guid);
if (_entity.IsTrackingChanges)
{
MergeChanges(navigationEntity, entityPath, !_entity.IsTrackingChanges);
}
CreateHandlers(navigationEntity, entityPath);
}
}
}
}
if (_entity.IsTrackingChanges)
{
change = new PropertyChange(path, e.PropertyName, entity.Guid, e.Before, e.After, entity.State);
if (isDbEntityEnumerable)
{
change = new PropertyChange(path, e.PropertyName, entity.Guid, e.Before, e.After);
}
PurgeLast(p.GetGetMethod().ReturnType, change);
AddChange(change);
Validate(change, isIDbEntity);
}
//_logTo.DebugQueue(new EntityPropertyChangedLogEntry(SettingsModel.Current.User.id, entity.PrimaryKeys, entity.GetType(), propertyPath));
}
}
