Mvvmcross Plugins - Cirrious.MvvmCross.Plugins.Messenger

Build  Model：

public class LoginMessage : MvxMessage
 {
        public LoginMessage(object sender, string userName)
                : base(sender)
            {
                UserName = userName;
            }

            public string UserName { get; private set; }
}

Send Message：

LoginMessage message = new LoginMessage(this, UserName);

 Mvx.Resolve<IMvxMessenger>().Publish(message); 

Receive Message：

private MvxSubscriptionToken _token;

 _token = Mvx.Resolve<IMvxMessenger>().Subscribe<LoginMessage>(OnLoginMessage);

  private void OnLoginMessage(LoginMessage loginMessage)
   {
            txtUserName.Text = loginMessage.UserName;
    }