UnauthorizedAccessException when using ShutdownManager even with systemManagement declared

Question

Note: not duplicate of this as I already declare systemManagement capacity.

UPDATE : the API is only available to IoT devices, if you want an API for UWP, vote it here .

I have a simple UWP app that has both Target and Min version 2004 (Build 19041) . The UI simply has two buttons Shutdown and Restart:

private void OnShutDownClicked(object sender, RoutedEventArgs e)
{
    ShutdownManager.BeginShutdown(ShutdownKind.Shutdown, TimeSpan.FromSeconds(1));
}

private void OnRestartCLicked(object sender, RoutedEventArgs e)
{
    ShutdownManager.BeginShutdown(ShutdownKind.Restart, TimeSpan.Zero);
}

Following the doc , I added systemManagement capacity into the manifest using the UI, and also double-checked the XML code:

<Package
  xmlns="http://schemas.microsoft.com/appx/manifest/foundation/windows10"
  xmlns:mp="http://schemas.microsoft.com/appx/2014/phone/manifest"
  xmlns:uap="http://schemas.microsoft.com/appx/manifest/uap/windows10"
  xmlns:iot="http://schemas.microsoft.com/appx/manifest/iot/windows10"
  IgnorableNamespaces="uap mp iot">
  ...
  <Capabilities>
    <iot:Capability Name="systemManagement"/>
  </Capabilities>
  ...

However, I still get UnauthorizedAccessException when executing the code, no matter which code I run (Shutdown or Restart). I already tried uninstalling the app and load it again from VS.

System.UnauthorizedAccessException: 'Access is denied. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED))'

Did I miss something? How do I resolve this?

---

UPDATE: so I tried adding this line to test if I actually have access to this capacity:

var temp = ShutdownManager.IsPowerStateSupported(PowerState.ConnectedStandby);

According to the doc , this method also requires the same capacity. However, the code runs well through it. That means something must be missing from BeginShutdown :

---

UPDATE 2: Apparently this API is for IoT devices only? Can I use this API on Windows Desktop device or is there any similar API? Google always lead me there and there doesn't seem to be any alternative.

Answer 1

This API is designed for IoT devices and the function is not supported in UWP apps. UWP apps are running in a sandbox that is isolated so UWP apps have limited access to system resources and are not allowed to access these system functions like shutting down the device.