Why can you use thread adding controls in WinForms but not WPF?

Question

In a dummy WinForms application, I can create a ListBox at design time, create a background thread at runtime, and then add controls to the ListBox from the background thread. But if I did the same in WPF, I get an error.

Why can I do this in WinForms but not in WPF? Is my WinForm example not the same as WPF? Or is there really a reason why it works great in WinForms and not in WPF?

Winforms:

private List<Label> _labels;

public Form1()
{
    InitializeComponent();

    Thread test = new Thread(DoStuff);
    test.SetApartmentState(ApartmentState.STA);
    test.Start();
}

private void DoStuff()
{
    _labels = new List<Label>();

    _labels.Add(new Label() { Text = "Label1" });
    _labels.Add(new Label() { Text = "Label2" });
    _labels.Add(new Label() { Text = "Label3" });

    if (listBox1.InvokeRequired)
    {
        listBox1.Invoke((MethodInvoker)delegate { listBox1.DataSource = _labels; });
    }
    else
    {
        listBox1.DataSource = _labels;
    }
}

WPF:

public partial class MainWindow : Window
{
    private ObservableCollection<Label> _labels;
    public MainWindow()
    {
        InitializeComponent();

        Thread test = new Thread(DoStuff);
        test.SetApartmentState(ApartmentState.STA);
        test.Start();
    }

    private void DoStuff()
    {
        _labels = new ObservableCollection<Label>();
        _labels.Add(new Label() { Content = "Label1" });
        _labels.Add(new Label() { Content = "Label2" });
        _labels.Add(new Label() { Content = "Label3" });

        this.Dispatcher.BeginInvoke((Action)(() =>{ icMain.ItemsSource = _labels; }));
    }
}

This is the error I am getting. Pretty standard and expected:

Answer 1

WinForms . , , WinForms , . , , .

, , WinForms . ( , , , , .)

Answer 2

, - WinForms. WPF .

.