protected override void OnNavigatedFrom(NavigationEventArgs e)
{
base.OnNavigatedFrom(e);
if (e.NavigationMode == NavigationMode.Back)
{
Collection.LocomotivesIDs.CollectionChanged -= CollectionItems_CollectionChanged;
Collection.AccessoriesIDs.CollectionChanged -= CollectionItems_CollectionChanged;
Collection = null;
}
}
protected override void OnNavigatedTo(NavigationEventArgs e)
{
base.OnNavigatedTo(e);
if (e.NavigationMode == NavigationMode.New)
{
Collection = e.Parameter as EcosItemsCollection;
isNew = Collection == null;
if (isNew)
Collection = new EcosItemsCollection();
Collection.LocomotivesIDs.CollectionChanged += CollectionItems_CollectionChanged;
Collection.AccessoriesIDs.CollectionChanged += CollectionItems_CollectionChanged;
SetUIVisibility();
ValidateItems();
}
}