public async Task FlushFavoritesAsync()
{
await Initialization;
var settings = new JsonSerializerSettings
{
TypeNameHandling = TypeNameHandling.Objects,
TypeNameAssemblyFormat = System.Runtime.Serialization.Formatters.FormatterAssemblyStyle.Simple
};
try
{
using (Stream outStream = await _favoritesFile.OpenStreamForWriteAsync())
using (var gzip = new GZipStream(outStream, CompressionLevel.Optimal))
{
gzip.SerializeJsonToStream(_favorites, settings);
}
}
catch (IOException ex)
{
//todo: Log me. Should we inform the user? There's nothing they can do, but info might be handy.
System.Diagnostics.Debug.WriteLine($"Could not serialize favorites: {ex}: {ex.Message}");
}
}
public override async Task OnNavigatedFromAsync(IDictionary <string, object> suspensionState, bool suspending)
{
if (suspending)
{
IStorageFile tripResultCacheFile = await _fileService.GetTempFileAsync(
SuspensionKeys.TripResults_HasSavedState, CreationCollisionOption.ReplaceExisting);
using (Stream fileStream = await tripResultCacheFile.OpenStreamForWriteAsync())
using (GZipStream jsonStream = new GZipStream(fileStream, CompressionLevel.Fastest))
{
jsonStream.SerializeJsonToStream(TripResults.ToArray());
}
//and make a note of it in the suspension dict:
suspensionState.AddOrUpdate(SuspensionKeys.TripResults_HasSavedState, true);
suspensionState.AddOrUpdate(SuspensionKeys.TripResults_FromName, FromName);
suspensionState.AddOrUpdate(SuspensionKeys.TripResults_ToName, ToName);
}
else //Don't want to unhook the "back-returns from Detailed View" behavior if the user is just switching apps.
{
BootStrapper.BackRequested -= BootStrapper_BackRequested;
}
await Task.CompletedTask;
}