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copied!<p>Makubex is correct - you need to wait until things get loaded up before the visuals are in a state where they've actually rendered anything capable of being copied; that said, while I'm not on a computer where I've got Studio installed, I <em>do</em> have LINQPad installed....</p> <pre><code>void Main() { mainWindow = new Window(){ Width = 640, Height = 480, Title = "Main Window" }; canvas = new Canvas { Width = 640, Height = 480 }; System.Windows.Size size = new System.Windows.Size( canvas.Width, canvas.Height ); // Measure and arrange the surface canvas.Measure( size ); canvas.Arrange( new Rect( size ) ); canvas.Background = new SolidColorBrush( Colors.Purple ); mirrorTimer = new DispatcherTimer( TimeSpan.FromMilliseconds(1000.0 / 60.0), DispatcherPriority.Background, CopyToMirror, Dispatcher.CurrentDispatcher); updateTimer = new DispatcherTimer( TimeSpan.FromMilliseconds(1000.0 / 60.0), DispatcherPriority.Background, DrawSomething, Dispatcher.CurrentDispatcher); mainWindow.Loaded += (o,e) => { mirrorWindow = new Window { Width = 640, Height = 480, Title = "Mirror Window" }; mirrorWindow.Show(); mirrorWindow.Loaded += (o2,e2) => { mirrorTimer.Start(); }; }; mainWindow.Closed += (o,e) => { if(mirrorTimer != null) { mirrorTimer.Stop(); mirrorWindow.Close(); } }; mainWindow.Content = canvas; mainWindow.Show(); } Window mainWindow; Window mirrorWindow; Canvas canvas; DispatcherTimer mirrorTimer; DispatcherTimer updateTimer; Random rnd = new Random(); private void DrawSomething(object sender, EventArgs args) { canvas.Children.Clear(); canvas.Background = Brushes.White; var blob = new Ellipse() { Width = rnd.Next(0, 20), Height = rnd.Next(0, 20) }; blob.Fill = new SolidColorBrush(Color.FromArgb(255, (byte)rnd.Next(0,255), (byte)rnd.Next(0,255), (byte)rnd.Next(0,255))); Canvas.SetLeft(blob, (int)rnd.Next(0, (int)canvas.ActualWidth)); Canvas.SetTop(blob, (int)rnd.Next(0, (int)canvas.ActualHeight)); canvas.Children.Add(blob); } private void CopyToMirror(object sender, EventArgs args) { var currentImage = (mirrorWindow.Content as Image); if(currentImage == null) { currentImage = new Image(){ Width = 640, Height = 480 }; mirrorWindow.Content = currentImage; } RenderTargetBitmap bitmap = new RenderTargetBitmap( (int)canvas.Width, (int)canvas.Height, 96d, 96d, PixelFormats.Pbgra32 ); bitmap.Render( canvas ); BitmapEncoder encoder = new BmpBitmapEncoder(); encoder.Frames.Add( BitmapFrame.Create( bitmap ) ); BitmapImage bmp = new BitmapImage() { CacheOption = BitmapCacheOption.OnLoad }; MemoryStream outStream = new MemoryStream(); encoder.Save(outStream); outStream.Seek(0, SeekOrigin.Begin); bmp.BeginInit(); bmp.StreamSource = outStream; bmp.EndInit(); currentImage.Source = bmp; } </code></pre>

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