// Resets the ObjectChangeTracker to the Unchanged state and
// rollback the original values as well as the record of changes
// to collection properties
public void CancelChanges()
{
OnObjectStateChanging(ObjectState.Unchanged);
// rollback original values
Type type = _parentObject.GetType();
foreach (var originalValue in OriginalValues.ToList())
{
type.GetProperty(originalValue.Key).SetValue(
_parentObject, originalValue.Value, null);
}
// create copy of ObjectsAddedToCollectionProperties
// and ObjectsRemovedFromCollectionProperties
Dictionary <string, ObjectList> removeCollection =
ObjectsAddedToCollectionProperties.ToDictionary(n => n.Key, n => n.Value);
Dictionary <string, ObjectList> addCollection =
ObjectsRemovedFromCollectionProperties.ToDictionary(n => n.Key, n => n.Value);
// rollback ObjectsAddedToCollectionProperties
if (removeCollection.Count > 0)
{
foreach (KeyValuePair <string, ObjectList> entry in removeCollection)
{
PropertyInfo collectionProperty = type.GetProperty(entry.Key);
IList collectionObject = (IList)collectionProperty.GetValue(_parentObject, null);
foreach (object obj in entry.Value.ToList())
{
collectionObject.Remove(obj);
}
}
}
// rollback ObjectsRemovedFromCollectionProperties
if (addCollection.Count > 0)
{
foreach (KeyValuePair <string, ObjectList> entry in addCollection)
{
PropertyInfo collectionProperty = type.GetProperty(entry.Key);
IList collectionObject = (IList)collectionProperty.GetValue(_parentObject, null);
foreach (object obj in entry.Value.ToList())
{
collectionObject.Add(obj);
}
}
}
OriginalValues.Clear();
ObjectsAddedToCollectionProperties.Clear();
ObjectsRemovedFromCollectionProperties.Clear();
_objectState = ObjectState.Unchanged;
OnObjectStateChanged(ObjectState.Unchanged);
}