Represents an event that a Windows Runtime app can trigger to initiate a long-running operation with a device or sensor.
DeviceUseTrigger lets your Windows Runtime app access sensors and peripheral devices in the background, even when your foreground app is suspended. For example, depending on where your app is running, it could use a background task to synchronize data with devices or monitor sensors.
This class can be used in Windows Store apps and Windows Phone Store apps. However, a DeviceUseTrigger background task supports different APIs, and is subject to different policies, depending where it's running (PC or phone). To learn more about these differences, see Accessing sensors and devices from a background task.
var deviceUseTrigger = new Windows.ApplicationModel.Background.DeviceUseTrigger();
The DeviceUseTrigger class has these types of members:
The DeviceUseTrigger class has these constructors.
|DeviceUseTrigger||Constructor for DeviceUseTrigger. Takes no parameters.|
The DeviceUseTrigger class has these methods. With C#, Visual Basic, and C++, it also inherits methods from the Object class.
|RequestAsync(String)||Triggers the background task and returns a DeviceTriggerResult indicating success or failure of the trigger request. Takes the DeviceInformation.ID of the device or sensor that the background task will access.|
|RequestAsync(String,String)||Triggers the background task and returns a DeviceTriggerResult indicating success or failure of the trigger request. Takes the DeviceInformation.ID of the device or sensor that the background task will access, and an optional app-specific string passed to the background task identifying which operation to perform.|
The DeviceInformation.Id passed to the RequestAsync method must match the device or sensor that will perform the background operation. The DeviceInformation.Id is used by Windows to ensure that policy requirements are met. For more about policy requirements, see Accessing sensors and devices from a background task.
Note Before your app triggers a background task on a phone, it must first call RequestAccessAsync to check if the app is able to request a background task. This check is not required when your app is running on a PC.
Minimum supported client
|Windows 8.1 [Windows Store apps only]|
Minimum supported server
|Windows Server 2012 R2 [Windows Store apps only]|
Minimum supported phone
|Windows Phone 8.1 [Windows Phone Silverlight 8.1 and Windows Runtime apps]|