// Records an addition to collection valued properties on SelfTracking Entities.
internal void RecordAdditionToCollectionProperties(string propertyName, object value)
{
if (_changeTrackingEnabled)
{
// Add the entity back after deleting it, we should do nothing here then
if (ObjectsRemovedFromCollectionProperties.ContainsKey(propertyName) &&
ObjectsRemovedFromCollectionProperties[propertyName].Contains(value))
{
ObjectsRemovedFromCollectionProperties[propertyName].Remove(value);
if (ObjectsRemovedFromCollectionProperties[propertyName].Count == 0)
{
ObjectsRemovedFromCollectionProperties.Remove(propertyName);
}
return;
}
if (!ObjectsAddedToCollectionProperties.ContainsKey(propertyName))
{
ObjectsAddedToCollectionProperties[propertyName] = new ObjectList();
ObjectsAddedToCollectionProperties[propertyName].Add(value);
}
else
{
ObjectsAddedToCollectionProperties[propertyName].Add(value);
}
}
}
// 记录对 SelfTracking 实体的集合值属性的删除操作。
internal void RecordRemovalFromCollectionProperties(string propertyName, object value)
{
if (_changeTrackingEnabled)
{
// 如果在添加实体后重新删除该实体，则不应当在此处执行任何操作
if (ObjectsAddedToCollectionProperties.ContainsKey(propertyName) &&
ObjectsAddedToCollectionProperties[propertyName].Contains(value))
{
ObjectsAddedToCollectionProperties[propertyName].Remove(value);
if (ObjectsAddedToCollectionProperties[propertyName].Count == 0)
{
ObjectsAddedToCollectionProperties.Remove(propertyName);
}
return;
}
if (!ObjectsRemovedFromCollectionProperties.ContainsKey(propertyName))
{
ObjectsRemovedFromCollectionProperties[propertyName] = new ObjectList();
ObjectsRemovedFromCollectionProperties[propertyName].Add(value);
}
else
{
if (!ObjectsRemovedFromCollectionProperties[propertyName].Contains(value))
{
ObjectsRemovedFromCollectionProperties[propertyName].Add(value);
}
}
}
}
/// <summary>
/// Trackables the collection changed.
/// </summary>
/// <param name="sender">The sender.</param>
/// <param name="e">The <see cref="NotifyTrackableCollectionChangedEventArgs"/> instance containing the event data.</param>
/// <param name="propertyName">Name of the property.</param>
private void TrackableCollectionChanged(object sender, NotifyCollectionChangedEventArgs e, string propertyName)
{
switch (e.Action)
{
case NotifyCollectionChangedAction.Add:
foreach (var newItem in e.NewItems)
{
//todo:implémenter la récursivité sur l'ajout des élements dans la collection
//var project = newItem as IObjectWithChangeTracker;
//if (project != null)
//{
// if (this.ChangeTrackingEnabled)
// {
// project.ChangeTracker.Start();
// }
//}
RecordAdditionToCollectionProperties(propertyName, newItem);
}
break;
case NotifyCollectionChangedAction.Remove:
foreach (var odlItem in e.OldItems)
{
RecordRemovalFromCollectionProperties(propertyName, odlItem);
}
break;
case NotifyCollectionChangedAction.Reset:
{
// Cas d'un Clear sur la collection.
// Vide le cache des modifications pour la collection.
if (ObjectsRemovedFromCollectionProperties.ContainsKey(propertyName))
{
ObjectsRemovedFromCollectionProperties.Remove(propertyName);
}
if (ObjectsAddedToCollectionProperties.ContainsKey(propertyName))
{
ObjectsAddedToCollectionProperties.Remove(propertyName);
}
// Tranfère les données de départ dans les élements supprimés.
if (ObjectsOriginalFromCollectionProperties.Count > 0)
{
foreach (var item in ObjectsOriginalFromCollectionProperties[propertyName])
{
RecordRemovalFromCollectionProperties(propertyName, item);
}
}
}
break;
case NotifyCollectionChangedAction.Replace:
{
// Comment gérer le cas d'un changement d'instance dans la liste ?
}
break;
}
UpdateChangeState();
}
// Records a removal to collection valued properties on SelfTracking Entities.
internal void RecordRemovalFromCollectionProperties(string propertyName, Entity value)
{
if (IsChangeTrackingEnabled && _objectState != ObjectState.Added)
{
// Deleteing the entity after it has been added, we should do nothing here then
if (ObjectsAddedToCollectionProperties.ContainsKey(propertyName) &&
ObjectsAddedToCollectionProperties[propertyName].Contains(value))
{
ObjectsAddedToCollectionProperties[propertyName].Remove(value);
if (ObjectsAddedToCollectionProperties[propertyName].Count == 0)
{
ObjectsAddedToCollectionProperties.Remove(propertyName);
}
}
else
{
if (!ObjectsRemovedFromCollectionProperties.ContainsKey(propertyName))
{
ObjectsRemovedFromCollectionProperties[propertyName] = new EntityList();
}
ObjectsRemovedFromCollectionProperties[propertyName].Add(value);
}
}
}
