如何在WIndows 10中的BackgroundMediaPlayer中播放本地MP3文件

Question

我正在为Windows 10开发一个简单的MP3播放器。我无法播放本地存储文件mp3。甚至来自KnownFolders.MusicLibrary。

我成功地从项目（appx）播放MP3文件。

我尝试了很多解决方案，没有一个能为我工作。

尝试解决方案：

1. Error when Play file .mp3 (StorageFile ) with BackgroundMediaPlayer in isolated storage windows phone 8.1 rt
2. https://social.msdn.microsoft.com/Forums/sqlserver/en-US/f2d7a760-a175-453f-9575-739b14f68136/open-file-from-music-library-in-backgroundmediaplayer-using-window-phone-81-xaml-c?forum=wpdevelop
3. https://social.msdn.microsoft.com/Forums/windowsapps/en-US/a016edcf-d3d7-44e8-83e3-3a66d14ff301/why-not-play-songs-from-phone-music-library-on-device-in-wp81-wherein-music-plays-in-emulator?forum=wpdevelop
4. https://msdn.microsoft.com/en-us/library/windows/apps/xaml/dn642090.aspx
5. How to pass an object to background project in Windows Phone?

还有很多。