Xamarin MVVM 将用户数据推送到视图模型

Question

正如标题所说，我想通过用户信息将用户信息提供给我的视图模型，但问题是视图模型已注册为依赖项，并且我将其内容绑定到 xaml 页面本身。如何将用户信息发送到视图模型本身？ 谢谢！

Xaml.cs 部分：

[XamlCompilation(XamlCompilationOptions.Compile)]
    public partial class Calendar : ContentPage
    {
        public Calendar(User user)
        {
            InitializeComponent();            
            FileImageSource image = new FileImageSource
            {
                File = "calendar.png"
            };           
            Icon = image;// push user information to the ICalendarViewModel
            BindingContext = AppContainer.Container.Resolve<ICalendarViewModel>();
        }
    }

界面：

public interface ICalendarViewModel : INotifyPropertyChanged
    {

    }

引导部分注册依赖：

public class Bootstrap
    {
        public IContainer CreateContainer()
        {
            var containerBuilder = new ContainerBuilder();
            RegisterDependencies(containerBuilder);
            return containerBuilder.Build();
        }


        protected virtual void RegisterDependencies(ContainerBuilder builder)
        {
            builder.RegisterType<CalendarViewModel>()
                .As<ICalendarViewModel>()
                .SingleInstance();


        }
    }

CalendarViewModel：我不知道这是否会有所帮助

public class CalendarViewModel : ViewModelBase, ICalendarViewModel
    {
        public event PropertyChangedEventHandler PropertyChanged;

        public string ErrorMessage { get; set; }
        private CourseInformation _information;
        private ICourseInformationRepository _repository;

        public CalendarViewModel()
        {
            _repository = new CourseInformationRepository();
            LoadData();
        }

        private ObservableCollection<CourseInformation> _courses;
        public ObservableCollection<CourseInformation> Courses
        {
            get
            {
                return _courses;
            }
            set
            {
                _courses = value;
                RaisePropertyChanged(nameof(Courses));
            }
        }

        private void LoadData()
        {
            try


{
            ObservableCollection<CourseInformation> CourseList = new ObservableCollection<CourseInformation>(_repository.GetAllCourseInformation());
            Courses = new ObservableCollection<CourseInformation>();
            DateTime date;          
            foreach (var course in CourseList)
            {
                string [] cour = course.Date.Split('/');
                cour[2] = "20" + cour[2];
                date = new DateTime(Convert.ToInt32(cour[2]), Convert.ToInt32(cour[1]), Convert.ToInt32(cour[0]));
                if (date == DateTime.Now)//TESTING WITH TEST DATE, datetime.now
                {
                    if (course.FromTime.Length < 4)
                    {
                        course.FromTime = "0" + course.FromTime;
                    }
                    if (course.UntilTime.Length < 4)
                    {
                        course.UntilTime = "0" + course.UntilTime;
                    }
                    course.FromTime = course.FromTime.Insert(2, ":");
                    course.UntilTime = course.UntilTime.Insert(2, ":");
                    Courses.Add(course);
                }
            }               
        }
        catch (ServerUnavailableException e)
        {
            ErrorMessage = "Server is niet beschikbaar, ophalen van kalender is niet mogelijk.";
        }
    }

    private void RaisePropertyChanged(string propertyName)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}

app.xaml.cs 中的引导绑定：

public partial class App : Application
    {
        public App()
        {
            InitializeComponent();
            AppContainer.Container = new Bootstrap().CreateContainer();
            MainPage = new LoginView();         
        }

        protected override void OnStart()
        {
            // Handle when your app starts
        }

        protected override void OnSleep()
        {
            // Handle when your app sleeps
        }

        protected override void OnResume()
        {
            // Handle when your app resumes
        }
    }

Answer 1

我想对@LeRoy 发表评论（没有足够的声誉），使用一个框架。我会推荐 FreshMVVM，您可以将对象传递到 ViewModel 甚至传递服务。它使一切变得干净整洁，而且效果很好。

Answer 2

您的 CalendarViewModel 视图模型不应该包含 BindableBase 吗？

public class CalendarViewModel : BindableBase, ViewModelBase, ICalendarViewModel

你使用什么框架？棱镜，freshmvvm。

您的视图和视图模型通常由框架自动处理，您只需注册您的页面。

Container.RegisterTypeForNavigation<Views.CalendarPage>();