LiteDB.StateStore

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You can get, set or even subscribe a KeyValue state without writing actions nor reducers.

// a helper which can collect all your subscriptions
var subscriptions = new SubscriptionManager();
using (var db = new RealtimeLiteDatabase(new MemoryStream()))
{
    // subscribe to username
    subscriptions += db.StateStore<string>("username").Subscribe(username =>
        Dispatcher.BeginInvokeOnMainThread(() =>
        {
            userLabel.Text = username;
        }));
    db.StateStore<string>("username").Set("FuturistiCoder");
    // userLabel.Text will be 'FuturistiCoder';
}

StateStore<T> : the T can be reference type or value type. But if you want to save and listen collections, use db.Realtime.Collection<T> instead (LiteDB.Realtime).

subscriptions += db.Realtime.Collection<TodoItem>("TodoItems").Subscribe(items =>
    Dispatcher.BeginInvokeOnMainThread(() =>
    {
        listView.ItemsSource = items;
    })
    // listView will be updated after TodoItems changed
);

Call subscriptions.Dispose()will dispose all your added subscriptions.