How do I keep the selection in ListBox when reloading ItemsSource

Question

I am experimenting with WPF and MVVM in our system. However iam having a problem with keeping things selected in lists using only MVVM ( without doing extra CollectionViews ). What i currently have is the list

ObservableCollection<ReservationCustomerList> Customers;

And then a property storing the selected Customer

ReservationCustomerList SelectedCustomer;

In my opinion now, when the list reloads (actually from another thread async), the selection should be able to be kept, however this does not happen.

Does someone have a nice clean way of achieving this ?

Answer 1

The way we did it was that we did not replace the collection. We added/removed the entries and updated existing entries if required. This maintains the selection.

You can use LINQ methods like Except to identify items that are new or removed.