获取使用的VisualBrush一个WPF区System.Drawing.Bitmap [英] Get System.Drawing.Bitmap of a WPF Area using VisualBrush

问题描述

问题的关键是，我需要转换为System.Drawing.Bitmap（.Net框架2.0）得到一个WPF网格其内容的单个帧。

The point is, that I need to convert to a System.Drawing.Bitmap (.Net Framework 2.0) to get a single frame of an WPF Grid with its content.

我读的VisualBrush 和 DrawingBrush ，但我不能想象它应该如何工作。

I read about VisualBrush and DrawingBrush but I cannot imagine how it should work.

我可以在任何WPF 的BitmapSource 转换成我的系统。 Drawing.Bitmap 成功。但如何获得的BitmapSource 从我的网格？

I can convert any WPF BitmapSource into my System.Drawing.Bitmap successfully. But how to receive the BitmapSource from my Grid?

感谢

推荐答案

要转换视觉到的BitmapSource 您可以使用< A HREF =htt​​p://msdn.microsoft.com/en-us/library/system.windows.media.imaging.rendertargetbitmap.aspx> RenderTargetBitmap 的VisualBrush 和 DrawingVisual ：

To convert a Visual to BitmapSource you can use RenderTargetBitmap, VisualBrush and 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;
}   

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