c# - Generating a screenshot of a WPF window

Question

In winforms, we can use DrawToBitmap. Is there a similar method to this in WPF?

Answer 1

Have you tried RenderTargetBitmap? https://msdn.microsoft.com/en-us/library/system.windows.media.imaging.rendertargetbitmap.aspx

There are a few "screenshot" methods around that use that, like this one taken from here:

    public static void CreateBitmapFromVisual(Visual target, string fileName)
    {
        if (target == null || string.IsNullOrEmpty(fileName))
        {
            return;
        }

        Rect bounds = VisualTreeHelper.GetDescendantBounds(target);

        RenderTargetBitmap renderTarget = new RenderTargetBitmap((Int32)bounds.Width, (Int32)bounds.Height, 96, 96, PixelFormats.Pbgra32);

        DrawingVisual visual = new DrawingVisual();

        using (DrawingContext context = visual.RenderOpen())
        {
            VisualBrush visualBrush = new VisualBrush(target);
            context.DrawRectangle(visualBrush, null, new Rect(new Point(), bounds.Size));
        }

        renderTarget.Render(visual);
        PngBitmapEncoder bitmapEncoder = new PngBitmapEncoder();
        bitmapEncoder.Frames.Add(BitmapFrame.Create(renderTarget));
        using (Stream stm = File.Create(fileName))
        {
            bitmapEncoder.Save(stm);
        }
    }