我有一个使用 MultiScaleImage 控件的应用程序，我想添加一个缩略图窗口，其中包含未缩放的图像和一个指示在 MultiScaleImage 控件中查看的部分的矩形轮廓。我没有图像的缩略图，但想在运行时创建它们。
1) 有没有办法从 MultiScaleImage 控件获取未缩放图像的副本并将其放入图像控件中，或者我是否必须使用另一个具有相同源的 MultiScaleImage 控件。
2）任何提示或例子将不胜感激。
大卫
I have an application that uses a MultiScaleImage control and I would like to add a thumnbnail window with the unzoomed image and a rectangle outline indicating the portion being viewed in the MultiScaleImage control. I don't have thumbnails for the images but want to create them at runtime.
1) is there a way to get a copy of the unzoomed image from the MultiScaleImage control to put into an Image control or do I have to just use another MultiScaleImage control with the same Source.
2) Any hints or examples would be appreciated.
David
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使用 WriteableBitmap 类。如果 multiscaleImage 是 MultiscaleImage 控件，thumbnail 是 Image 控件，则此代码将从前者捕获图像并将其显示在后者中。
大卫
Use the WriteableBitmap class. If multiscaleImage is a MultiscaleImage control and thumbnail is an Image control, then this code will capture the image from the former and display it in the latter.
David
请参阅 Jeff Prosise 的博客文章，使用他建议的最后一个函数：
http://www.wintellect.com/CS/blogs/jprosise/archive/2009/12/17/silverlight-s-big-image-problem-and-what-you-can-do- about-it.aspx
你可以适当地调整它（有一个额外的好处，它不需要在内存中渲染整个巨大的图像，它应该直接缩放它，以便 MultiScaleImage 将使用正确的缩放级别数据对于那么小的规模）
Please see Jeff Prosise's blog post on this, use the last function he suggests:
http://www.wintellect.com/CS/blogs/jprosise/archive/2009/12/17/silverlight-s-big-image-problem-and-what-you-can-do-about-it.aspx
you could adapt it appropriately (has the added benefit that it won't need to render the whole huge image in memory, it should render it directly scaled so MultiScaleImage would use the correct zoom level data for that small scale)