Xaml Binding to empty collection

Hello

I have an entity called Employee with an ObservableCollection<Address> and Address has several properties eg. Town.

Now I'd like to bind directly to the Town value as in

<TextBox Text="{Binding Path=Employee.Addresses[0].Town" />

If Addresses is empty, I get as expected
System.Windows.Data Error: 17 ... ArgumentOutOfRangeException

The application continues running without problems, but an exception is an exception.

I know, I could define in my ViewModel a new string property TownValue, verify if Addresses[0] exists and then assign that value to TownValue and set the Binding to that property.

But I'd prefer some solution on the xaml/Binding side.

• A new collection inheriting from ObservableCollection with an overriden indexer?
• Converter with the collection and the index as parameters?
• Some MarkupExtension to extend the Binding?

Any hints?