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Home/ Questions/Q 8983119
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Editorial Team
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Editorial Team
Asked: June 15, 20262026-06-15T20:45:25+00:00 2026-06-15T20:45:25+00:00

I’m trying to pass my application to Microsoft market place, however I’m having 3

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I’m trying to pass my application to Microsoft market place, however I’m having 3 error in my background agent, that I don’t understand.

Is says:

 Unsupported API cannot be used by a background agent. Assembly contoso.dll was trying to 
use Micosoft.Phone.Shell.PhoneApplicationService::get_Current 

Unsupported API cannot be used by a background agent. Assembly contoso.dll was trying to 
use Micosoft.Phone.Shell.PhoneApplicationService::get_State

Unsupported API cannot be used by a background agent. Assembly contoso.dll was trying to 
use Micosoft.Phone.Shell.PhoneApplicationService

So I’ve looked for unsupported API (http://msdn.microsoft.com/en-us/library/windowsphone/develop/hh202962(v=vs.105).aspx)

I’m using ShellToast class but it’s supposed to be supported ??

I don’t understand why or when I’m using this PhoneApplicationService, it is not referenced in my background agent, and the only class I’m using in the Microsoft.Phone.Shell namespace is ShellToast…

Also I’m using IsoStorage but it’s allowed from background agent

Any guess without the code? Do you know when this errors could fires up ?

Thanks,

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  1. Editorial Team
    Editorial Team
    2026-06-15T20:45:26+00:00Added an answer on June 15, 2026 at 8:45 pm

    OK I’m stupid I’ve found the solution.

    Indeed it was not my ShellToast class, but my TempDataStorage which use PhoneApplicationService.Current.State for temporary storage.

    Sorry ’bout that

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