Create dynamic images from WPF User Control inside an HTTP Handler

Question

I'm using Microsoft's PivotViewer control in one of my Silverlight projects. I'm creating a JIT collection and was hoping to dynamically generate the images based on the rendered result of a WPF UserControl. In order to generate the images I'm using an HTTP Handler to serve the images up dynamically.

Can anyone point me in the right direction on how I might best go about this. It's all quite a mashup of technologies and a bit difficult to know where best to begin.

Thanks in advance.

EDIT: I have found a guy that's done this in ASP.Net MVC here -

score 2 · Accepted Answer · answered Dec 01 '10 at 13:25

2

If you want to stream on the HTTP stream a WPF visual, the pseudo code would be something like this:

        RenderTargetBitmap bmp = new RenderTargetBitmap(width, height, 96, 96, PixelFormats.Pbgra32);
        bmp.Render([your WPF visual or control instance]);

        // choose the format if you want something other than png
        PngBitmapEncoder png = new PngBitmapEncoder();
        png.Frames.Add(BitmapFrame.Create(bmp));

        // stream this on the web
        png.Save([the web stream, like Response.OutputStream]);

answered Dec 01 '10 at 13:25

Simon Mourier

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Done this but I'm getting nothing but a black rectangle,..no matter what xaml I give it. Any idea? – EightyOne Unite Dec 01 '10 at 15:00
Ahh,..found it. You have to call Control.Arrange() before it will display properly. – EightyOne Unite Dec 01 '10 at 16:06

Create dynamic images from WPF User Control inside an HTTP Handler

1 Answers1