Snapshot of an WPF Canvas Area using RenderTargetBitmap

Question

I want to create a Snapshot of the Canvas Area in my Application. I\'m using Visual brush to get the Snapshot and saving the same using PngEncoder. But the resulting PNG is

Answer 1

Thank you both for the question and the answer.

For the benefit of the others looking for the same answer

I found that Clemens way leaves a black band in the image with the image shifted either down or right. As if it was not rendering the element at the correct position in the bitmap.

So I had to use the VisualBrush as Amar suggested.

Here is the code that worked for me:

    RenderTargetBitmap RenderVisual(UIElement elt)
    {
        PresentationSource source = PresentationSource.FromVisual(elt);
        RenderTargetBitmap rtb = new RenderTargetBitmap((int)elt.RenderSize.Width,   
              (int)elt.RenderSize.Height, 96, 96, PixelFormats.Default);

        VisualBrush sourceBrush = new VisualBrush(elt);
        DrawingVisual drawingVisual = new DrawingVisual();
        DrawingContext drawingContext = drawingVisual.RenderOpen();
        using (drawingContext)
        {
            drawingContext.DrawRectangle(sourceBrush, null, new Rect(new Point(0, 0), 
                  new Point(elt.RenderSize.Width, elt.RenderSize.Height)));
        }
        rtb.Render(drawingVisual);

        return rtb;
    }