public override async void OnNavigatedTo(INavigationParameters parameters) //Est appelé avant l'affichage de la page { base.OnNavigatedTo(parameters); var user = _authenticationService.AuthenticatedUser; string key = await _secureStorageService.GetUserEncryptionKeyAsync(user); var decryptedCard = _cryptoService.Decrypt(user.CreditCard, key); _creditCard = decryptedCard; }