UnauthorizedAccessException during storageFolder.CreateFileAsync

Question

I have the following piece of code

    // Point to c:\\users\\yancheng\\documents\\visual studio 2012\\Projects\\App5\\App5\\bin\\x86\\Debug\\AppX
    StorageFol         


        

Answer 1

You are trying to create a file in the installation folder of the app. This location is a read-only location (see http://msdn.microsoft.com/en-us/library/windows/apps/hh967755.aspx).

Strangely copying files to this folder and deleting files from it is possible if the app was installed by Visual Studio, what I reported as a bug in Microsoft Connect. All in all Apps should not be able to change any content of the installation folder.

Apps are only allowed to write to the folders reached through ApplicationData and the KnownFolders. In latter case corresponding capabilities and file types must be declared.