wpf监听listboxitem的属性变化

[weixin_38055393]

public class ItemViewModel : ViewModelBase
{
private double _scroce = 0.0d;
public double Score
{
get { return _scroce; }
set
{
_scroce = value;
OnPropertyChanged(() => Score);
}
}
}

public class ListViewModel : ViewModelBase
{
private ObservableCollection<ItemViewModel> _items = new ObservableCollection<ItemViewModel>();
public ObservableCollection<ItemViewModel> Items
{
get { return _items; }
set
{
_items = value;
OnPropertyChanged(() => Items);
}
}
}
你好，如上图，我有个listviewmodel，它的Items绑定到Listbox上，现在我需要监听itemviewmodel上的score变化事件，该如何监听呢？谢谢

code