Windows Phone 8 Functionality Into Windows Phone 7

Question

如果我使用Visual Studio 2012 RC为Windows Phone 8编写应用程序，我想知道我是否可以在Windows Phone 7上安装并运行相同的应用程序？

Answer 1

No, there is no back-compatibility. You could do it the other way round, though, and write a WP7 app that would run on WP8

Answer 2

It is not possible to build for WP8 and deploy to both WP7 and WP8.

It is possible to build for WP7 and deploy to both WP7 and WP8.

The best solution is to code carefully, and clearly separate out your use of WP8-specific APIs.

You could then have two projects, one for WP7 that you build using WP7 tools, and one for WP8, that you build using WP8 tools. Linked files in visual studio would be a good way of achieving this.