问题
With the new SDK 8.1 of Windows Phone is there a way to write file on SD Card ? Before we could only read. I have an idea to save file from my app on SD Card and this can be interesting for the Lumia 520 who have few memory.
回答1:
More information about Data and Files you will find in the documentation. And as written here:
What you can access
Your app can only read and write files of file types that the app has registered to handle in the app manifest file.
Your app can also create and manage folders.
So if you had declared File Type Association - there shouldn't be a problem to write/read files.
Note also that your App can be installed on SD Card, then all its files will be located there.
来源：https://stackoverflow.com/questions/23296804/can-i-write-file-on-sd-card