/// <summary>
/// Serialize user scores (current and previous).
/// </summary>
/// <param name="scoreboard">Scoreboard that contains all he users that have played this game.</param>
public void SerializeScores(Scoreboard scoreboard)
{
try
{
using (MemoryStream memoryStream = new MemoryStream())
{
// Serialize the SaveFile.
DataContractSerializer serializer = new DataContractSerializer(typeof(Scoreboard));
serializer.WriteObject(memoryStream, scoreboard);
memoryStream.Position = 0L;
using (StreamReader memoryStreamReader = new StreamReader(memoryStream))
// Save to .xml and encrypt with AES.
try
{
using (Stream fileStream = new FileStream(FILE_NAME, FileMode.Create, FileAccess.Write, FileShare.None))
{
AesCryptoServiceProvider aesCryptoService = new AesCryptoServiceProvider();
using (ICryptoTransform cryptoTransform = aesCryptoService.CreateEncryptor(
EncryptionValues.EncryptionKey,
EncryptionValues.EncryptionInitializationVector))
using (CryptoStream cryptoStream = new CryptoStream(fileStream, cryptoTransform, CryptoStreamMode.Write))
using (StreamWriter cryptoStreamWriter = new StreamWriter(cryptoStream))
{
string dataToEncrypt = memoryStreamReader.ReadToEnd();
cryptoStreamWriter.Write(dataToEncrypt);
cryptoStreamWriter.Flush();
}
aesCryptoService.Dispose();
}
}
catch (FileNotFoundException exception)
{
MessageBox.Show("A handled exception just occurred: " + exception.Message, "File Not Found Exception", MessageBoxButton.OK, MessageBoxImage.Warning);
}
catch (ArgumentNullException exception)
{
MessageBox.Show("A handled exception just occurred: " + exception.Message, "Argument Null Exception", MessageBoxButton.OK, MessageBoxImage.Warning);
}
catch (ArgumentException exception)
{
MessageBox.Show("A handled exception just occurred: " + exception.Message, "Argument Exception", MessageBoxButton.OK, MessageBoxImage.Warning);
}
}
}
catch (Exception exception)
{
MessageBox.Show("A handled exception just occurred: " + exception.Message, "Exception", MessageBoxButton.OK, MessageBoxImage.Warning);
}
}
/// <summary>
/// Deserialize user scores.
/// </summary>
/// <returns>Scoreboard that contains all he users that have played this game.</returns>
public Scoreboard DeserializeScoreboard()
{
try
{
// Read .xml file.
using (FileStream fileStream = File.Open(FILE_NAME, FileMode.Open))
{
// First decrypt.
AesCryptoServiceProvider aesCryptoService = new AesCryptoServiceProvider();
using (ICryptoTransform cryptoTransform =
aesCryptoService.CreateDecryptor(EncryptionValues.EncryptionKey, EncryptionValues.EncryptionInitializationVector))
using (CryptoStream cryptoStream = new CryptoStream(fileStream, cryptoTransform, CryptoStreamMode.Read))
using (StreamReader cryptoStreamReader = new StreamReader(cryptoStream))
using (MemoryStream memoryStream = new MemoryStream())
// Create new SaveFile object based on the saved configuration.
using (StreamWriter memoryStreamWriter = new StreamWriter(memoryStream))
{
string decryptedSave = cryptoStreamReader.ReadToEnd();
memoryStreamWriter.Write(decryptedSave);
memoryStreamWriter.Flush();
memoryStream.Position = 0L;
DataContractSerializer serializer = new DataContractSerializer(typeof(Scoreboard));
Scoreboard scoreboard = (Scoreboard)serializer.ReadObject(memoryStream);
aesCryptoService.Dispose();
return(scoreboard);
}
}
}
catch (FileNotFoundException exception)
{
MessageBox.Show("A handled exception just occurred: " + exception.Message, "File Not Found Exception", MessageBoxButton.OK, MessageBoxImage.Warning);
}
catch (UnauthorizedAccessException exception)
{
MessageBox.Show("A handled exception just occurred: " + exception.Message, "Unauthorized Access Exception", MessageBoxButton.OK, MessageBoxImage.Warning);
}
catch (ArgumentNullException exception)
{
MessageBox.Show("A handled exception just occurred: " + exception.Message, "Argument Null Exception", MessageBoxButton.OK, MessageBoxImage.Warning);
}
catch (ArgumentException exception)
{
MessageBox.Show("A handled exception just occurred: " + exception.Message, "Argument Exception", MessageBoxButton.OK, MessageBoxImage.Warning);
}
catch (Exception exception)
{
MessageBox.Show("A handled exception just occurred: " + exception.Message, "Exception", MessageBoxButton.OK, MessageBoxImage.Warning);
RemoveFile();
}
return(null);
}
/// <summary>
/// Update or create a new scoreboard.
/// </summary>
private void SaveScoreboard()
{
User user = ((WindowViewModel)((MainWindow)Application.Current.MainWindow).DataContext).User;
user.Score = answers.Where(a => a.IsCorrect).ToList().Count *SCORE_MULTIPLIER;
Scoreboard scoreboard = scoresFileHandler.DoesFileExist() ? scoresFileHandler.DeserializeScoreboard() : new Scoreboard();
scoreboard.Users.Add(user);
scoresFileHandler.SerializeScores(scoreboard);
}
/// <summary>
/// Deserializes the .xml file and returns users that have played the game before.
/// </summary>
/// <returns>Users that have played the game before.</returns>
private List <User> GetUsers()
{
Scoreboard scoreboard = highscoresFileHandler.DeserializeScoreboard();
return(scoreboard.Users);
}