Binding to collection in viewmodel with IsSynchronizedWithCurrentItem - wpf

Question

I have a grid displaying the contents of an observableCollection of Persons, and two textboxes showing the properties of the selected row. A master-detail view if you will.
When assigning the observablecollection to the datacontext you can simply do this:
<Grid>
<Grid Background="Gray">
<Grid.RowDefinitions>
<RowDefinition></RowDefinition>
<RowDefinition Height="30"></RowDefinition>
</Grid.RowDefinitions>
<igWPF:XamDataGrid Grid.Row="0" DataSource="{Binding}" IsSynchronizedWithCurrentItem="True" />
<StackPanel Grid.Row="1" Orientation="Horizontal">
<TextBox Height="21" Width="100" Margin="5,0,5,0" Text="{Binding Name}"></TextBox>
<TextBox Height="21" Width="100" Text="{Binding Age}"></TextBox>
</StackPanel>
</Grid>
</Grid>
The IsSynchronizedWithCurrentItem-property makes sure the selected item in the grid is the one that is treated in the textboxes.
I was wondering if it is possible to do this exact thing when the observablecollection is not in the datacontext directly, but rather is located in a viewmodel (which is assigned to the datacontext of the window).
public class TestViewModel: DependencyObject
{
public TestViewModel(){
Results = new ObservableCollection<Person>();
Results.Add(new Person { Age = "23", Name = "Able" });
Results.Add(new Person { Age = "25", Name = "Baker" });
}
public ObservableCollection<TagDlgmtEntity> Results
{
get { return (ObservableCollection<Person>)GetValue(ResultsProperty); }
set { SetValue(ResultsProperty, value); }
}
public static readonly DependencyProperty ResultsProperty =
DependencyProperty.Register("Results", typeof(ObservableCollection<Person>), typeof(TestViewModel), new PropertyMetadata(null));
}
I would like not to reassign a datacontext on a lower level in the visual tree, or bind with the selectedItem property of the grid.
Is it possible to use this mechanism this way?
Thanks!

Answer 1

Yes, that's possible. Declare your binding like this:
DataSource="{Binding Results}"
Example ViewModel
Assumption: ViewModelBase implements INotifyPropertyChanged (see my comment on the question)
public class MainWindowViewModel : ViewModelBase
{
private readonly List<Person> _results;
public MainWindowViewModel()
{
_results = new List<Person>
{
new Person {Age = "23", Name = "Able"},
new Person {Age = "25", Name = "Baker"}
};
ResultsView = CollectionViewSource.GetDefaultView(_results);
ResultsView.CurrentChanged += (sender, args) => RaisePropertyChanged(() => Name);
}
public ICollectionView ResultsView { get; private set; }
public string Name
{
get
{
return ((Person) ResultsView.CurrentItem).Name;
}
}
}