<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

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.

CodePudding user response：

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.