PropertyChangedCallback不更新GUI

Question

嗨，我有一个mainWindow，它在同一GUI界面下将实时传感器数据传递给usercontrol图表，而PropertyChangedCallback似乎没有更新任何GUI内容（图表未接收任何数据），请在下面找到我的代码：

1. MainWindow.xaml

   <local:ConstantChangeChart1 x:Name="cscs"></local:ConstantChangeChart1>
   

2. MainWindow.xaml.cs

   cscs.SetValue(ConstantChangeChart1.MyCustomProperty, main_liveValue_lbl.Content);
   

3. 用户控件-ConstantChangeChart1

   public static readonly DependencyProperty MyCustomProperty = DependencyProperty.Register("MyCustom", typeof(string), typeof(ConstantChangeChart1),
       new PropertyMetadata(
       new PropertyChangedCallback(OnMyCustomChanged)));
   
   public string MyCustom
   {
       get
       {
           return this.GetValue(MyCustomProperty) as string;
       }
       set
       {
           this.SetValue(MyCustomProperty, value);
           OnPropertyChanged("MyCustom");
       }
   }
   public static void OnMyCustomChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
   {
       ConstantChangeChart1 originator = d as ConstantChangeChart1;
       if (originator != null)
       {
           originator.OnMyPropertyChanged(d,e);
       }
   }
   
   private void OnMyPropertyChanged(DependencyObject d ,DependencyPropertyChangedEventArgs e)
   {
       ConstantChangeChart1 control = (ConstantChangeChart1)d;
       if(control !=null)
       {
           //Thread.Sleep(150);
           var now = DateTime.Now;
           //_trend += r.Next(-8, 10);
   
           this.Dispatcher.Invoke(() =>
           {
               ChartValues.Add(new Model.MeasureModel
               {
                   DateTime = now,
                   Value = Convert.ToDouble(MyCustom)
               });
           });
   
           SetAxisLimits(now);
   
           //lets only use the last 150 values
           if (ChartValues.Count > 150) ChartValues.RemoveAt(0);
       }
   }