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    <p>That example has a good start but I've found it's got a lot of unneeded junk along with it. The main thing is that you don't need to have a separate WPF project.</p> <p>Here's what to do:</p> <ul> <li>Reference PresentationCore, PresentationFramework and WindowsBase in your web project.</li> <li>Create a Canvas and other WPF objects programmatically in an STA thread.</li> <li>Call a few special methods on them to make sure they update outside of the context of a WPF app.</li> <li>Render them to an image with RenderTargetBitmap.</li> <li>Shut down the thread's dispatcher.</li> <li>Set the mime type and output the image with ASP.NET.</li> </ul> <p>To make this more efficient you could re-use the same thread rather than creating a new one for each image. In that case you would only need to clean up the dispatcher when you shut down the thread.</p> <p>Here's the full working code I have:</p> <pre><code>using System; using System.Web; using System.Threading; using System.IO; using System.Windows; using System.Windows.Media; using System.Windows.Media.Imaging; using System.Windows.Controls; using System.Windows.Documents; public partial class _Default : System.Web.UI.Page { private byte[] imageBuffer; public void Page_Load(object sender, EventArgs e) { this.RenderImage(); Response.Clear(); Response.ContentType = @"image/png"; Response.BufferOutput = true; Response.BinaryWrite(this.imageBuffer); Response.Flush(); } public void RenderImage() { Thread worker = new Thread(new ThreadStart(this.RenderImageWorker)); worker.SetApartmentState(ApartmentState.STA); worker.Name = "RenderImageWorker"; worker.Start(); worker.Join(); } public void RenderImageWorker() { Canvas imageCanvas = new Canvas { Width = 600, Height = 200, Background = Brushes.Azure }; TextBlock tb = new TextBlock(); tb.Width = (double)400; //tb.Height = (double)200; tb.TextAlignment = TextAlignment.Center; tb.Inlines.Add(new Run("This is ")); tb.Inlines.Add(new Bold(new Run("bold"))); tb.Inlines.Add(new Run(" text.")); tb.FontSize = 30; tb.Foreground = Brushes.Blue; imageCanvas.Children.Add(tb); // Update layout imageCanvas.Measure(new Size(imageCanvas.Width, imageCanvas.Height)); imageCanvas.Arrange(new Rect(new Size(imageCanvas.Width, imageCanvas.Height))); RenderTargetBitmap bitmapRenderer = new RenderTargetBitmap((int)imageCanvas.ActualWidth, (int)imageCanvas.ActualHeight, 96, 96, PixelFormats.Pbgra32); bitmapRenderer.Render(imageCanvas); PngBitmapEncoder png = new PngBitmapEncoder(); png.Frames.Add(BitmapFrame.Create(bitmapRenderer)); using (MemoryStream memoryStream = new MemoryStream()) { png.Save(memoryStream); this.imageBuffer = memoryStream.ToArray(); } if (bitmapRenderer.Dispatcher.Thread.IsAlive) { bitmapRenderer.Dispatcher.InvokeShutdown(); } } } </code></pre>
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    1. COwould be better to do if(!worker.Join(timeoutelapsed)) { worker.Abort(); } instead in case something goes wrong ?
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    2. COCalling Abort() on a thread is generally not a good programming practice: it can leave resources leaking and generally leave the program in a bad state. It's quite difficult to write code that behaves nicely when its thread is aborted.
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