如何將control.background（畫筆）轉換爲位圖？

Question

如何將system.windows.controls.controlgroundback（brush）轉換爲位圖？謝謝。

Answer 1

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; 
}