public async Task<bool> Submit(User user) { bool submitted; if (user.Blocked) throw new Exception("User blocked."); var userDb = _users.FirstOrDefault(e => e.Id == user.Id); if (userDb != null) { userDb.Group = user.Group; submitted = true; } else submitted = false; return await Task.FromResult(submitted); }
public UserViewModel(IScreen screen, User user, IUserRepository userRepository) { _userRepository = userRepository; HostScreen = screen; // Commands var canSubmit = this.WhenAny(e => e.Code, code => code.Value.IsValid()); Submit = ReactiveCommand.CreateAsyncTask(canSubmit, _ => userRepository.Submit(Model)); Submit.Subscribe(result => MessageBox.Show(result ? "Success" : "Failure")); // Observe on UI thread Submit.ThrownExceptions.ObserveOn(RxApp.MainThreadScheduler) .Select(ex => new UserError("It will fail again, try anyway?", ex.Message)) .SelectMany(UserError.Throw) .Subscribe(resolution => { if (resolution == RecoveryOptionResult.RetryOperation) Submit.Execute(null); }); // Model subscription this.WhenAnyValue(e => e.Model).Where(e => e != null).Subscribe(model => { Code = model.Code; Group = model.Group; }); Model = user; // Properties subscriptions this.WhenAnyValue(e => e.Group).Subscribe(group => Model.Group = group); this.WhenAnyValue(e => e.Code).Subscribe(code => Model.Code = code); // Subscribe to error handle UserError.RegisterHandler(async error => { // This shouldn't be a messagebox because is blocking the application, you must provide context and offer a resolution to the user not just showing "error" await Task.Delay(1); var message = new StringBuilder(); bool hasRecoveryOptions = error.ErrorCauseOrResolution.IsValid(); if (hasRecoveryOptions) message.AppendLine(error.ErrorCauseOrResolution); message.AppendLine(error.ErrorMessage); var result = MessageBox.Show(message.ToString(), "Alert!", hasRecoveryOptions ? MessageBoxButton.YesNo : MessageBoxButton.OK); return hasRecoveryOptions && result == MessageBoxResult.Yes ? RecoveryOptionResult.RetryOperation : RecoveryOptionResult.CancelOperation; }); }
public async Task<IList<Menu>> GetMenuByUser(User user) { if (user == null) return new List<Menu> {new Menu(MenuOption.Login)}; // TODO real call to DB List<Menu> result = (user.Group == UserGroup.Admin) ? new List<Menu> { new Menu(MenuOption.Login), new Menu(MenuOption.User), new Menu(MenuOption.Placeholder) } : new List<Menu> { new Menu(MenuOption.User), new Menu(MenuOption.Placeholder) }; return await Task.FromResult(result); }