// Captures the original value for a property that is changing.
internal void RecordOriginalValue(string propertyName, object oldValue, object newValue)
{
if (IsChangeTrackingEnabled && _objectState != ObjectState.Added)
{
if (OriginalValues.ContainsKey(propertyName))
{
if (object.Equals(OriginalValues[propertyName], newValue))
{
OriginalValues.Remove(propertyName);
if (OriginalValues.Count == 0 && _objectState == ObjectState.Modified)
{
State = ObjectState.Unchanged;
ModifiedProperties.Clear();
}
else
{
ModifiedProperties.Remove(propertyName);
}
}
}
else
{
OriginalValues[propertyName] = oldValue;
}
}
}
// Resets the ObjectChangeTracker to the Unchanged state and
// clears the original values as well as the record of changes
// to collection properties
public void AcceptChanges()
{
ModifiedProperties.Clear();
OriginalValues.Clear();
ObjectsAddedToCollectionProperties.Clear();
ObjectsRemovedFromCollectionProperties.Clear();
IsChangeTrackingEnabled = true;
State = ObjectState.Unchanged;
}
/// <summary>
/// Clears the changes.
/// </summary>
internal void ClearChanges()
{
ModifiedProperties.Clear();
AddedObjects.Clear();
DeletedObjects.Clear();
}