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编写成一个函数,方便后面调用
private void takephoto()
{
if (this.bitmap != null)
{
// Create a render target to which we'll render our composite image
RenderTargetBitmap renderBitmap = new RenderTargetBitmap((int)all.ActualWidth, (int)all.ActualHeight, 96.0, 96.0, PixelFormats.Pbgra32);
DrawingVisual dv = new DrawingVisual();
using (DrawingC
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