public override void OnNavigatedTo(object parameter, NavigationMode mode, IDictionary <string, object> state)
{
// no state restore when new or refreshed (after resume) page
if (mode == NavigationMode.New || mode == NavigationMode.Refresh)
{
return;
}
if (state.ContainsKey(TEMPORARY_ITEM_KEY))
{
var deserializedTempItem = _serializationService.DeserializeJson <ItemModel>(state[TEMPORARY_ITEM_KEY] as string); // TODO: FIXME: deserialization/ser. done impl. ???
TemporaryItem = new ItemViewModel(deserializedTempItem);
}
}
/// <summary>
/// Load specific data.
/// </summary>
/// <param name="guid">Id of data to load.</param>
/// <returns>Return data.</returns>
public virtual async Task <T> LoadAsync(Guid guid)
{
// save all in dictionary
if (!cache.ContainsKey(guid))
{
var file = await storageService.GetFileAsync(Path.Combine("Data", $"{guid}.json"));
var data = serializationService.DeserializeJson <T>(await file.OpenStreamForReadAsync());
if (data == null)
{
System.Diagnostics.Debug.WriteLine(file.Path + " was not loaded");
return(await Task.FromResult <T>(default(T)));
}
cache.Add(guid, data);
}
return(cache[guid]);
}
