Prism: Share ViewModel's property in parent ViewModel

Question

I'm developing WPF Prism application using Unity container. The issue is: I have a ListBox, each element has it's own ViewModel. In that element I need to select a location from a list of locations. List of locations is the same for all elements. How could I share this list in the parent ViewModel?

On the internet I googled that I may:

1. Use RegionContext. But it's not right way (RegionContext could serve only one object, but I have not only locations).

2. Use SharedService. But, by my opinion, this way is more suitable for real-time data changing.

Is there the right way? Best practice

Answer 1

If your list is always going to be the same, I usually use a Static class

public static class Lists
{
    public static List<Location> Locations {get; set;}

    static Lists()
    {
        Lists = DAL.GetLocations();
    }
}

Then in my XAML

<ListBox ItemsSource="{Binding Source={x:Static local:Lists.Locations}}"
         SelectedItem="{Binding CurrentLocation}" />