MVVM Pattern in Master-Detail when editing details

Question

i have a ObservableCollection with some data. They are displayed as Master (ListBox) and Detail (some Labels). I use binding and IsSynchronizedWithCurrentItem to show the correct details to the selected master item. This works all fine. Now i want to edit some details (load different image). I implemeted this a a Button Command in the ViewModel.

But how do i know which item is selected (UI) in the ViewModel-layer ?

Thanks for help

Answer 1

I don't really find the IsSynchronizedWithCurrentItem property that useful in MVVM scenarios. Just expose another SelectedItem property in the ViewModel.

public ItemType SelectedItem
{
    get { return _selectedItem; }
    set
    {
        _selectedItem = value;
        // your logic here
    }
}