c# - NotifyPropertyChanged 未触发

Question

我正在尝试为 ListBox 捕获 SelectedItem，然后为 Button 触发数据模板单击事件。我在 notifypropertychanged 事件处理程序中放置了一个断点，但它从未触发。我在这里做错了什么？

xaml:

   <ListBox x:Name="lstbox_playerContainer"
       ItemsSource="{Binding ChildObjectOC}"  
       SelectedItem="{Binding SelectedChildObject, Mode=TwoWay}">
       <ListBox.ItemTemplate>
           <DataTemplate>
               <Button Name="btn_childButton" Click="btn_childButton_Click"/>                                        
           </DataTemplate>
        </ListBox.ItemTemplate>
   </ListBox>

c#:

public partial class PlayerCrowdPromptPage: INotifyPropertyChanged {

     public PlayerCrowdPromptPage() {
          InitializeComponent();
          DataContext = this;
     }

    private ObservableCollection<PlayerCrowdObjectBO> childObjectOC = new ObservableCollection<PlayerCrowdObjectBO>();
    public ObservableCollection<PlayerCrowdObjectBO> ChildObjectOC {
        get {
            return childObjectOC;
        }
        set {
            childObjectOC = value;
        }
    }

     private PlayerCrowdObjectBO selectedChildObject;
     public PlayerCrowdObjectBO SelectedChildObject {
         get { return selectedChildObject; }
         set {
               selectedChildObject = value;
               OnPropertyChanged("SelectedChildObject");
         }
    }

    public event PropertyChangedEventHandler PropertyChanged;
            protected void OnPropertyChanged(string propertyName) {
            if (PropertyChanged != null){
               PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
    }
}

Answer 1

点击 Button 不会自动选择相应的项目。您可以在事件处理程序中以编程方式选择它:

private void btn_childButton_Click(object sender, RoutedEventArgs e)
{
    Button btn = (Button)sender;
    ListBoxItem lbi = lstbox_playerContainer.ItemContainerGenerator.ContainerFromItem(btn.DataContext) as ListBoxItem;
    lbi.IsSelected = true;
}

这应该设置 SelectedChildObject 属性并引发 PropertyChanged 事件。