The Device OEM and the Operating System have the goal to ensure effective usage of the device resources. It will restrict the constant usage of the device resources to optimize power consumption and to prevent the device components from being heated up. As an application developer, we have to face these system restrictions and make the best possible out of them.
I would recommend you to check out this public post as this discusses many prospects. These topics may discuss Native or Web API, but there exists some alternative API / features for .NET also.
Is it possible to keep Tizen application alive non stop - Stack Overflow
++ How can I read sensor data when the display is off? | Tizen Developers
For example, you may try a package of a UI app with a service app. The UI app will launch the service app. The service app running in the background will read sensor data. While reading sensor data from the background, if the data crosses the 50~120 boundary it will launch the UI app for further operations.
In addition, the system will kill the service app running in the background for a long period. You have to take some additional measurements here. You can use the Alarm API to re-launch the service application from both your service application & UI application from time to time. The minimum interval for launching has to be 10 minutes or above.
And also use the background category (sensor) in your app manifest. Ensure you’re using the proper Sensor PausePolicy, interval, listeners,etc. Might also use the device Power/Resource request APIs, but remember that will cause system warning pop-ups.
Device Sensors | Tizen Docs
Namespace Tizen.Sensor (samsung.github.io)
Alarms | Tizen Docs
Class Alarm (samsung.github.io)
Class Power (samsung.github.io)
That’s all I can share from my experience, hope this helps.