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POGenerate Image at Runtime
 

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    <p>I am trying to render some XAML at runtime. My XAML is dynamically constructed in a StringBuilder. As an example, here is a sample:</p> <pre><code>StringBuilder xaml = new StringBuilder(); xaml.Append("&lt;Canvas xmlns=\"http://schemas.microsoft.com/winfx/2006/xaml/presentation\" "); xaml.Append("xmlns:x=\"http://schemas.microsoft.com/winfx/2006/xaml\" Height=\"135\" "); xaml.Append("Width=\"210\" Background=\"White\" x:Name=\"Page\"&gt;"); string url = "http://www.mydomain.com/images/background.png"; xaml.Append("&lt;Image Width=\"300\" Height=\"200\" Canvas.Left=\"0\" Canvas.Top=\"0\" "); xaml.Append("x:Name=\"bgImage\" Source=\""); xaml.Append(url); xaml.Append("\" /&gt;"); xaml.Append("&lt;/Canvas&gt;"); </code></pre> <p>Please notice the Image element in this sample. If I put this XAML in a .xaml file it runs fine. If I paste it into Blend, it works fine. However, I need to wait for this image to be downloaded and then convert the rendered XAML to a .png. In order to do this, I am using the following code:</p> <pre><code>StringReader stringReader = new StringReader(xaml.ToString()); XmlTextReader xmlReader = new XmlTextReader(stringReader); FrameworkElement frameworkElement = (FrameworkElement)(XamlReader.Load(xmlReader)); Size availableSize = new Size(300, 200); frameworkElement.Measure(availableSize); frameworkElement.Arrange(new Rect(availableSize)); BitmapSource bitmap = RenderToBitmap(frameworkElement); PngBitmapEncoder encoder = new PngBitmapEncoder(); encoder.Frames.Add(BitmapFrame.Create(bitmap)); FileStream fileStream = new FileStream(filename, FileMode.Create); encoder.Save(fileStream); fileStream.Close(); </code></pre> <p>The problem is, the .png that is generated always ignores the Image element. I am guessing because the Image source is not downloaded. How do I generate an image from some XAML at runtime that includes an Image?</p> <p>Thank you</p>
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