I want to make an app that shows pictures. But I want to be able to zoom in and out with gestures. I fixed this by including a toolkit into my project. But my actual question is, can I use or is there a control that's already created for me to show pictures like the picture library of the WP7 phone itself. I thought there wasn't but the Facebook app has a similar way of showing the pictures. Did Facebook rewrite the whole thing or is there a control somewhere that someone made?
The SlideView control in Telerik's RadControls for Windows Phone sounds like what you're looking for.
Have you tried a MultiScaleImage control? It's designed to work with multiple layers, but if you only specify one layer, it might suit what you're trying to do.
来源：https://stackoverflow.com/questions/5602053/how-to-make-or-use-a-standard-image-viewer-for-wp7