Canvas: Copy ImageSource

See more:

C#

.NET

WPF

Canvas

The goal: To render canvas1 to canvas2.
The problem: The code doesn't work.
The question: How to solve?
The code:

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();

        this.Loaded += MainWindow_Loaded;
    }

    void MainWindow_Loaded(object sender, RoutedEventArgs e)
    {
        Canvas canvas1 = new Canvas();
        canvas1.Width = 300;
        canvas1.Height = 300;
        canvas1.Background = Brushes.Red;

        canvas1.UpdateLayout();

        Image image = new Image();
        RenderTargetBitmap bmp = new RenderTargetBitmap((int)canvas1.Width, (int)canvas1.Height, 0, 0, PixelFormats.Pbgra32);
        bmp.Render(canvas1);
        image.Source = bmp;

        Canvas canvas2 = new Canvas();
        canvas2.Width = 300;
        canvas2.Height = 300;
        canvas2.Background = Brushes.Black;
        canvas2.Children.Add(image);

        this.Content = canvas2;
    }
}