WPF 中保存 window(窗口)或者canvas成图片

最近需要用到这个功能,搜了一下不少代码有问题 ,找到一个效果比较好的，支持多级子元素 记一下.

private void button_save_window_Click(object sender, RoutedEventArgs e)
        {

            util.SaveWindow(this,96,"d:\\window.png");
        }

        private void button_save_canvas_Click(object sender, RoutedEventArgs e)
        {

            util.SaveCanvas(this,this.canvas1, 96, "d:\\canvas.png");
        }
    }

    public static class util
    {
        public static void SaveWindow(Window window, int dpi, string filename)
        {

            var rtb = new RenderTargetBitmap(
                (int)window.Width, //width
                (int)window.Width, //height
                dpi, //dpi x
                dpi, //dpi y
                PixelFormats.Pbgra32 // pixelformat
                );
            rtb.Render(window);

            SaveRTBAsPNG(rtb, filename);

        }

        public static void SaveCanvas(Window window, Canvas canvas, int dpi, string filename)
        {
            Size size = new Size(window.Width , window.Height );
            canvas.Measure(size);
            //canvas.Arrange(new Rect(size));

            var rtb = new RenderTargetBitmap(
                (int)window.Width, //width
                (int)window.Height, //height
                dpi, //dpi x
                dpi, //dpi y
                PixelFormats.Pbgra32 // pixelformat
                );
            rtb.Render(canvas);

            SaveRTBAsPNG(rtb, filename);
        }

        private static void SaveRTBAsPNG(RenderTargetBitmap bmp, string filename)
        {
            var enc = new System.Windows.Media.Imaging.PngBitmapEncoder();
            enc.Frames.Add(System.Windows.Media.Imaging.BitmapFrame.Create(bmp));

            using (var stm = System.IO.File.Create(filename))
            {
                enc.Save(stm);
            }
        } 

原文链接