RxUI example

gistfile1.txt

    public class LoginPageModel : ReactiveObject, IBasePageModel
    {

        public ReactiveCommand<Unit, bool> SignInCommmand;
        public ReactiveCommand<Unit, bool> CreateAccountCommmand;
        public ReactiveCommand<Unit, bool> ForgotPassWordCommmand;

        public extern bool IsBusy { [ObservableAsProperty] get; } 

        [Reactive]
        public string UserName { get; set; }

        [Reactive]
        public string Password { get; set; }


        public LoginPageModel()
        {

            var canLogin =
                this.WhenAnyValue(x => x.UserName, x => x.Password,
                        (user, pass) => !String.IsNullOrWhiteSpace(user) && !String.IsNullOrWhiteSpace(pass)
                        )
                    .DistinctUntilChanged();

            ForgotPassWordCommmand = ReactiveCommand.CreateFromTask(() =>
                XamvvmCore.CurrentFactory.SetNewRootAndResetAsync(this.GetCurrentPage(),
                    this.GetPageFromCache<ForgotPasswordPageModel>(), true));

            CreateAccountCommmand = ReactiveCommand.CreateFromTask(() =>
                XamvvmCore.CurrentFactory.SetNewRootAndResetAsync(this.GetCurrentPage(),
                    this.GetPageFromCache<CreateAccountPageModel>(), true));

            SignInCommmand = ReactiveCommand.CreateFromTask(Login ,canLogin);

            SignInCommmand.ThrownExceptions.ObserveOn(SynchronizationContext.Current).Subscribe(OnLoginException);


            
        }

        private async void OnLoginException(Exception exception)
        {
       
            if ((exception.GetType()) == typeof(JcLoginFailureException))
            {
                await UserDialogs.Instance.AlertAsync("Your username or password were incorrect", "Login failure");
                System.Diagnostics.Debug.WriteLine(exception.ToString());
                return;
            }
            throw exception;
        }


        private async Task<bool> Login()
        {
            var jcUser = await Locator.Current.GetService<IJistClientManager>().LogInUser(UserName, Password);

            return await XamvvmCore.CurrentFactory.SetNewRootAndResetAsync(this.GetCurrentPage(),
                this.GetPageFromCache<MainMenuTabPageModel>(), true);

        }
    }