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copied!<p>This problem was more complex than I thought. I’ve worked a lot with this. I share what I found because I think my experiences with it could help later someone else too.</p> <p>I worked with the sensors through service classes: these classes update my VMs and in the VMs I use my DispatcherHelper to update these on the UI. I knew if I want to update UI bound properties in valuechanged events of the sensors I need to call this update in the eventhandler with a dispatcherhelper but what I did not know is how they behave if they are communicating with VMs instead of Views. When I started the app I had no problems with updating the UI if the sensors had new value. My only problem was in this case that if I wanted to deactivate (pressed windows button) and activate (pressed back button) my app, I had no exception, I did not lost my debug session but only got a black page with a „Resuming…” text and running progressbar and nothing happened. </p> <p>What I missed was a crossthread/accessing exception. If I do it with a UI bound data it throws an exception but in this case it did not.</p> <p>One other thing: the accelerometer (I had a version only working with the accelerometer) works with the emulator but on the device it does not. I think the emulator try to simulate the accelerator by giving back values, but not in a right way (without a threading issue). </p> <p><strong>Solution</strong></p> <p>If I update within an eventhandler on the UI thread (with my own DispatcherHelper) everything works fine. It is a good lesson learned, always pay attention when interacting with sensors and other layers/threads (VM,V).</p>

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