private void RefreshPropertyTracker(string propertyName, bool raiseEvent)
{
// Determine the new value
var prop = TrackedObject.GetType().GetProperty(propertyName);
if (prop == null)
{
return; // Was probably an indexer that changed
}
var newValue = prop.GetValue(TrackedObject);
// If no ObjectTracker exists for the property, the old value was null
TrackerToken trackerToken;
object oldValue = null;
if (_propertyTrackers.TryGetValue(propertyName, out trackerToken))
{
// Detach old tracker from old value and remove it
oldValue = trackerToken.Tracker.TrackedObject;
trackerToken.Dispose();
_propertyTrackers.Remove(propertyName);
}
if (newValue != null)
{
// Add a new tracker for the new value
var token = new TrackerToken(newValue, propertyName, Tracker);
_propertyTrackers.Add(propertyName, token);
}
// Notify that property changed
if (raiseEvent)
{
Tracker.RaisePropertyPathChanged(new PropertyPathChangedEventArgs(propertyName, TrackedObject, oldValue, newValue));
}
}
private void InsertTrackerAt(int index, object item)
{
var token = new TrackerToken(item, index.ToString(), Tracker);
_itemTrackers.Insert(index, token);
}