在WPF中将canvas转换为writeablebitmap的最快方法？

我目前有一个writeablebitmap图像和带有绘图的canvas，我想将图像发送给对等。为了减少带宽，我想将canvas转换为writeablebitmap，因此我可以将两个图像blit到一个新的writeablebitmap。 问题是我无法找到转换canvas的好方法。 因此，我想问一下是否有直接的方法将canvas转换为writeablebitmap类。

Answer 1

这是从这篇博客文章中获取的，但它不是写入文件，而是写入WriteableBitmap。

public WriteableBitmap SaveAsWriteableBitmap(Canvas surface) { if (surface == null) return null; // Save current canvas transform Transform transform = surface.LayoutTransform; // reset current transform (in case it is scaled or rotated) surface.LayoutTransform = null; // Get the size of canvas Size size = new Size(surface.ActualWidth, surface.ActualHeight); // Measure and arrange the surface // VERY IMPORTANT surface.Measure(size); surface.Arrange(new Rect(size)); // Create a render bitmap and push the surface to it RenderTargetBitmap renderBitmap = new RenderTargetBitmap( (int)size.Width, (int)size.Height, 96d, 96d, PixelFormats.Pbgra32); renderBitmap.Render(surface); //Restore previously saved layout surface.LayoutTransform = transform; //create and return a new WriteableBitmap using the RenderTargetBitmap return new WriteableBitmap(renderBitmap); }