private void Item_StateChanged(IPersistent sender, StateEventArgs args)
{
if (args.NewState == PersistentState.Deleted)
{
IReferenceObject item = (IReferenceObject)sender;
map.Remove(item.Identity);
item.StateChanged -= Item_StateChanged;
}
}
protected void Set <TValue>(TValue value, ref TValue storage, [CallerMemberName] string propertyName = null)
{
if (state == PersistentState.Deleted)
{
return;
}
if (state == PersistentState.Loading)
{
storage = value; return;
}
if (state == PersistentState.New || state == PersistentState.Changed)
{
storage = value;
OnPropertyChanged(propertyName);
return;
}
LazyLoad(); // this code is executed for Virtual state of reference objects
// The code below is executed for Original state only
if (state != PersistentState.Original)
{
return;
}
bool changed = false;
if (storage != null)
{
changed = !storage.Equals(value);
}
else
{
changed = (value != null);
}
if (changed)
{
StateEventArgs args = new StateEventArgs(PersistentState.Original, PersistentState.Changed);
OnStateChanging(args);
storage = value;
state = PersistentState.Changed;
OnStateChanged(args);
}
OnPropertyChanged(propertyName);
}
private void NewItem_StateChanged(IPersistent sender, StateEventArgs args)
{
if (args.OldState == PersistentState.New && args.NewState == PersistentState.Original)
{
IReferenceObject item = (IReferenceObject)sender;
map.Add(item.Identity, item);
item.StateChanged -= NewItem_StateChanged;
item.StateChanged += Item_StateChanged;
}
}
