你好 二阳，
>>"后者可以用绑定 吗？"
答案是：可以。你只需要将Canvas的ActualHeight和ActualWidth属性与图像的PixelHeigth和PixelWidth属性绑定即可。你可以参考我的代码：
<Canvas Width="{Binding Path=ActualWidth, ElementName=img}">
<Imager x:Name="img" >
</Image>
</Canvas>
>>"怎么获取真实的大小呢？"
要获取图片的真实大小，你只需要将它实例化为一个BitmapImage类型的实例，在通过PixelHeight和PixelWidth属性就能获取到。下面是我的代码：
Dim bmp As BitmapImage
bmp = PhotoPreview.Source
MessageBox.Show(bmp.PixelHeight.ToString())
MessageBox.Show(bmp.PixelWidth.ToString())
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