要轉換Visual
到BitmapSource
你可以使用RenderTargetBitmap
,VisualBrush
和DrawingVisual
:
public BitmapSource ConvertToBitmapSource(UIElement element)
{
var target = new RenderTargetBitmap((int)(element.RenderSize.Width), (int)(element.RenderSize.Height), 96, 96, PixelFormats.Pbgra32);
var brush = new VisualBrush(element);
var visual = new DrawingVisual();
var drawingContext = visual.RenderOpen();
drawingContext.DrawRectangle(brush, null, new Rect(new Point(0, 0),
new Point(element.RenderSize.Width, element.RenderSize.Height)));
drawingContext.Close();
target.Render(visual);
return target;
}