Question

我正试图通过绑定检查所有复选框.. 单击按钮后，getChecked属性确实变为true，但复选框未被检查。有人看到我在这里做错了吗？这是列表框的XAML代码。

<ListBox Name="scroll"  ItemContainerStyle ="{StaticResource _ListBoxItemStyle}" Tag="{Binding SortingIndex}"  BorderBrush="#C62828" BorderThickness="1" Grid.Row="1" Grid.Column="0" HorizontalAlignment="Stretch"  VerticalAlignment="Stretch" >
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <StackPanel Name="checkboxStack">
                        <CheckBox IsChecked="{Binding Path=getChecked}"  Content="{Binding Path=vraag}"  Style="{StaticResource LifesaversCheckBoxesA}"/>
                        <StackPanel Margin="20,0,0,0">
                            <RadioButton GroupName="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType=ListBox}, Path=Tag}" Content="{Binding Path=antwoorden[0]}" FontSize="15" />
                            <RadioButton GroupName="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType=ListBox}, Path=Tag}" Content="{Binding Path=antwoorden[1]}" FontSize="15" />
                            <RadioButton GroupName="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType=ListBox}, Path=Tag}" Content="{Binding Path=antwoorden[2]}" FontSize="15" />
                        </StackPanel>
                    </StackPanel>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>

这是我为vragenLijst中的每个vraag将getChecked布尔值更改为true的按钮的事件处理程序。样本数据只是生成一些随机字符串。

public partial class LivesaversWindow : UserControl
{
    ObservableCollection<Vraag> vragenLijst;
    public LivesaversWindow()
    {
        InitializeComponent();
        vragenLijst = new VragenList(SampleData.vragen());

        scroll.ItemsSource = vragenLijst;

    }

    private void alles_Selecteren(object sender, RoutedEventArgs e)
    {
        if ((string)select.Content == "Alles selecteren")
        {
            foreach(Vraag vraag in vragenLijst)
            {
                vraag.getChecked = true;

            }
            select.Content = "Alles deselecteren";
        }
        else
        {
            foreach (Vraag vraag in vragenLijst)
            {
                    vraag.getChecked = false;
            }
            select.Content = "Alles selecteren";
        }
    }

这些是我正在使用的两个班级。

    public class Vraag 
{
    public List<string> antwoorden { get; set; }
    public string vraag { get; set; }
    public Boolean getChecked { get; set; }
}





 public class VragenList : ObservableCollection<Vraag>
{
    public VragenList(List<Vraag> vragen) :base()
    {
        foreach (var vraag in vragen)
        {
            Add(vraag);
        }
    }
}

Answer 1

您的班级Vraag必须实施 INotifyPropertyChanged 界面

Answer 2

您的类Vraag未实现INotifyPropertyChanged接口。因此，UI不会注册对视图中显示的对象所做的任何更改：

所以你需要做的就是实现像这样的INotifyPropertyChanged-Interface：

public class Vraag : INotifyPropertyChanged
{
    public List<string> antwoorden { get; set; }
    public string vraag { get; set; }

    private bool isChecked;

    public bool getChecked
    {
        get { return isChecked; }
        set
        {
            isChecked = value;
            OnPropertyChanged();
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;

    public void OnPropertyChanged([CallerMemberName] string propName = null)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propName));
    }
}

希望这有帮助！

列表框中的复选框未通过绑定进行检查

2 个答案: