Simple UWP live tile update
<p>I have a simple UWP shopping list app which talks to nothing and keeps its data in local storage. When the app is suspended, I write the current list to local storage. What I want to do at this same time (or <code>OnNavigatedFrom</code> the main page) is to also update the live tile to show a count of the number of items currently on the list so that the user can see this fact without having to launch the app.</p>

<p>I am having trouble finding docs/samples which are geared to a simple case like this... no background task, no push notifications, nothing happening on some schedule, just a simple update of a tile essentially in response to a user action. The examples I can find appear to involve the use of a <code>TileUpdater</code>, but I don't understand the need for one, or if/how it should be used in this simple case.</p>

<p>What is the bare minimum sequence of steps I have to do in my code to update say, a badge count (both to put a value there and to remove if the count would be zero)?</p>