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copied!<p>The data in your chart is not rendered in your PNG file because there is an animation applied to the reveal of the data points. Take a look at your LetterFrequency control in a Window, and you'll see the points gradually reveal themselves.</p> <p>Your code takes a snapshot of the control immediately after its creation, so you see no data.</p> <p>You could:</p> <ol> <li>wrap all this in a window and tell it to take the snapshot after X seconds </li> <li>disable all the animations in any controls you're going to snapshot </li> <li>maybe there's a way to "fast-forward" animations programmatically, but i couldn't find one</li> </ol> <p>Here's solution 1, and it works:</p> <pre><code> public partial class Window1 : Window { System.Windows.Threading.DispatcherTimer snapshotTimer; public Window1() { InitializeComponent(); this.Width = 600; this.Height = 400; let.Width = 600; let.Height = 400; let.Background = Brushes.White; this.Loaded += new RoutedEventHandler(Window1_Loaded); } void Window1_Loaded(object sender, RoutedEventArgs e) { this.snapshotTimer = new System.Windows.Threading.DispatcherTimer(); this.snapshotTimer.Interval = TimeSpan.FromSeconds(2); this.snapshotTimer.Tick += new EventHandler(snapshotTimer_Tick); this.snapshotTimer.IsEnabled = true; } void snapshotTimer_Tick(object sender, EventArgs e) { this.snapshotTimer.IsEnabled = false; WritePng(); } void WritePng() { RenderTargetBitmap bitmap = new RenderTargetBitmap((int)let.Width, (int)let.Height, 96d, 96d, PixelFormats.Pbgra32); bitmap.Render(let); PngBitmapEncoder png = new PngBitmapEncoder(); png.Frames.Add(BitmapFrame.Create(bitmap)); using (Stream stm = File.Create("test.png")) { png.Save(stm); } this.Close(); } } </code></pre>

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