Question

目的是将wpf组件转换为位图。如果wpf组件已经存在，则没有问题。发生了什么事： 1.如果这是以编程方式创建的，则缺少Bitmap。 2.如果我把它放在stackpanel中，wpf中的可视化是成功的

创建位图的代码

private void Create Bitmap
{
 var obj = new Button
            {
                Content = "BLA",
                Background = Brushes.Yellow,
                Foreground = Brushes.Black,
                Width = 150,
                Height = 40
                //RenderSize = new Size(150, 40)
            };
// Failure No bitmap created
    BitmapSource bitmap = StaticPdf.CreateBitmapSourceFromVisual(150, 40, obj, false);
    // Success, wpf show it!
    _commentsTimeLine.Children.Add(obj);

}

BitmapSourceConverter的代码

public static BitmapSource CreateBitmapSourceFromVisual(Double width, Double height, Visual visualToRender,
            Boolean undoTransformation)
        {
            if (visualToRender == null)
            {
                return null;
            }
            RenderTargetBitmap bmp = new RenderTargetBitmap((Int32) Math.Ceiling(width),
                (Int32) Math.Ceiling(height), 96, 96, PixelFormats.Pbgra32);

            if (undoTransformation)
            {
                DrawingVisual dv = new DrawingVisual();
                using (DrawingContext dc = dv.RenderOpen())
                {
                    VisualBrush vb = new VisualBrush(visualToRender);
                    dc.DrawRectangle(vb, null, new Rect(new Point(), new Size(width, height)));
                }
                bmp.Render(dv);
            }
            else
            {
                bmp.Render(visualToRender);
            }
            return bmp;
        }

我非常感谢每一个提示

非常感谢

最好的问候

将Wpf元素转换为位图

0 个答案: