View＆amp; amp; ViewModel MVVM Light

Question

我是使用Xamarin和MVVM（Light）的新手，我没有在互联网上找到一个很好的例子，可以将参数从视图传递回ViewModel，因此我可以在那里执行功能。 换句话说，我正在寻找一种方法来链接我的ViewModel和View，这样我就可以在视图中从我的ViewModel执行我的命令。 问题是我想用它传回参数。这似乎是一种痛苦。

我有一个非常基本的ViewModel

public ICommand RegisterUserAsyncCommand { get; set; }
    private async void RegisterUserAsync(User userInfo)
    {
        string firstName = userInfo.FirstName;
        string lastName = userInfo.LastName;
        string email = userInfo.Email;
        string password = userInfo.Password;
        bool admin = userInfo.Admin;
        //params = int, string, string, string, string, bool
        User newUser = new User(null, firstName, lastName, email, password, admin);
    }
    public RegisterViewModel(INavigationService navigationService)
    {
        _navigationService = navigationService;
        _userDataService = new UserDataService(new UserWebservice());
        //Commands
        RegisterUserAsyncCommand = new RelayCommand<User>(RegisterUserAsync);

    }

我的观点

_firstNameTextView = FindViewById<TextView>(Resource.Id.activityRegisterFirstNameTextView);
        _lastNameTextView = FindViewById<TextView>(Resource.Id.activityRegisterLastNameTextView);
        _emailTextView = FindViewById<TextView>(Resource.Id.activityRegisterEmailTextView);
        _passwordTextView = FindViewById<TextView>(Resource.Id.activityRegisterEmailTextView);
        _confirmTextView = FindViewById<TextView>(Resource.Id.activityRegisterConfirmPasswordTextView);
        _registerButton = FindViewById<Button>(Resource.Id.activityRegisterRegisterButton);

Binding registerBinding = this.SetBinding(() => ViewModel.Registration, () => new Registration(_firstNameTextView.Text, _lastNameTextView.Text, _emailTextView.Text, _passwordTextView.Text, _confirmTextView.Text, true)
                                                   );

_registerButton.SetCommand("Click", (GalaSoft.MvvmLight.Command.RelayCommand<GalaSoft.MvvmLight.Helpers.Binding>)ViewModel.RegisterUserAsyncCommand, registerBinding);

有人可以给我一个明确而简单的例子或者告诉我我做错了什么吗？