Android 将MVVM Light中的类绑定到Xamarin中的RelayCommand

我正在尝试将以下类绑定到relaycommand

  public class UserAuth
  {
    public string UserName { get; set; }
    public string Password { get; set; }
  }

这是我的主要活动课：

public partial class MainActivity : ActivityBaseEx
{

     private Binding<string, UserAuth> _userInformation;


    private Binding<string, UserAuth> _cool;

    public LoginViewModel LoginViewModel
    {
        get
        {
            return App.Locator.Login;
        }
    }


    protected override void OnCreate(Bundle bundle)
    {
        base.OnCreate(bundle);
        SetContentView(Resource.Layout.Main);



         _userInformation = this.SetBinding(()=> **....... WHAT GOES HERE!! I can do this for a simple string, but cannot figure it out for a class!**


        // Get our button from the layout resource and attach an event to it
        var signInButton = FindViewById<Button>(Resource.Id.btnSingIn);

        signInButton.SetCommand("Click", LoginViewModel.LoginCommand, _userInformation);

    }

请帮忙

---

谢谢

我在MainActivity.OnCreate中使用类似的内容：

_usernameBinding = this.SetBinding(() => Vm.userAuth.Username, () => Username.Text, BindingMode.TwoWay);
 _passwordBinding = this.SetBinding(() => Vm.userAuth.Password, () => Password.Text, BindingMode.TwoWay);

---

所以您需要2个绑定，一个用于用户名，一个用于密码

你得到过这个问题的答案吗？>

_userInformation = this.SetBinding(()=> // WHAT GOES HERE!! I can do  this for a simple 
                                        //string, but  cannot figure it out for a class! 

_usernameBinding = this.SetBinding(() => Vm.userAuth.Username, () => Username.Text, BindingMode.TwoWay);
 _passwordBinding = this.SetBinding(() => Vm.userAuth.Password, () => Password.Text, BindingMode.TwoWay);