我目前正在做一个项目，我主要专注于后端，我知道这个XAML代码不是很好的做法。我真的不习惯INotifyPropertyChanged接口，我真的很难看到错误。当我调试程序时，TourName不是空的，它从www.example.com获取值liveTourAppointment.tour.name;但是当我运行它时，窗口中的Label保持为空
下面是我的尝试：
XAML代码：

<Grid>
        
        <Label x:Name ="Label" Content="{Binding Path=TourName}" Margin="82,44,579,354"/>

    </Grid>
</Window>

后面的代码在这里：

public partial class LiveTourWin : Window, INotifyPropertyChanged
    {
        public TourAppointment liveTourAppointment { get; set; }
        
        private string _tourName =".";
        public string TourName
        {
            get { return _tourName; }
            set
            {
                {
                    if (value != _tourName)
                    {
                        _tourName = value;
                        OnPropertyChanged(nameof(TourName));
                    }
                }
            }
        }

        private readonly TourAppointmentController _tourAppointmentController;
        public LiveTourWin(int guideId)
        {
            InitializeComponent();
            this.DataContext = this;

            _tourAppointmentController = new TourAppointmentController();
            

            liveTourAppointment = _tourAppointmentController.GetLiveTour(guideId);
            this.TourName = liveTourAppointment.tour.name;
            
        }

        protected virtual void OnPropertyChanged(string propertyName = null)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }

        public event PropertyChangedEventHandler? PropertyChanged;
    }
}