public async Task SaveStateAsync()
        {
            var suspensionState = new SuspensionState()
            {
                SuspensionDate = DateTime.Now
            };

            var target = OnBackgroundEntering?.Target.GetType();
            var onBackgroundEnteringArgs = new OnBackgroundEnteringEventArgs(suspensionState, target);

            OnBackgroundEntering?.Invoke(this, onBackgroundEnteringArgs);

            await ApplicationData.Current.LocalFolder.SaveAsync(StateFilename, onBackgroundEnteringArgs);
        }
 public OnBackgroundEnteringEventArgs(SuspensionState suspensionState, Type target)
     : base()
 {
     SuspensionState = suspensionState;
     Target          = target;
 }