Question

我已经搜索了这个问题的答案，没有运气，我可以看到我已经有了所有正确的元素，但由于某种原因，这不想工作。

我需要在ListBox中选择一个项目时运行IsSelected setter。

XAML代码

<ListBox HorizontalAlignment="Left" Height="226" Margin="10,34,0,0" VerticalAlignment="Top" Width="132" ItemsSource="{Binding Activities}" >
        <ListBox.ItemContainerStyle>
            <Style TargetType="{x:Type ListBoxItem}">
                <Setter Property="IsSelected" Value="{Binding IsSelected}" />
            </Style>
        </ListBox.ItemContainerStyle>
     </ListBox>

C＃ViewModel

 private bool m_isSelected;
 public bool IsSelected
    {
        get { return m_isSelected; }
        set
        {
            if (value != m_isSelected)
            {
                m_isSelected = value;

                if (m_isSelected)
                {
                    CurrentViews = getCurrentViews((BasePropertyTypeVM)CurrentActivity);
                    AvailableViews = getAvailableViews(Properties);
                }

                OnPropertyChanged(() => IsSelected);
            }
        }
    }

非常感谢，

萨姆

Answer 1

ListBoxItem的IsSelected属性绑定到IsSelected视图模型属性，该属性必须是数据项类型的属性，即Activities集合的元素类型。

您需要声明这样的数据项类，例如

public class Activity : INotifyPropertyChanged
{
    public string Name { get; set; }

    private bool isSelected;
    public bool IsSelected
    {
        get { return isSelected; }
        set
        {
            if (value != isSelected)
            {
                value = isSelected;
                ...
            }
        }
    }

并声明Activities这样的集合：

public ObservableCollection<Activity> { get; set; }

可以在ListBoxItem的DataTemplate中使用Activity类的Name属性：

<ListBox ... ItemsSource="{Binding Activites}">
    <ListBox.ItemContainerStyle>
        <Style TargetType="ListBoxItem">
            <Setter Property="IsSelected" Value="{Binding IsSelected}"/>
        </Style>
    </ListBox.ItemContainerStyle>
    <ListBox.ItemTemplate>
        <DataTemplate>
            <TextBlock Text="{Binding Name}"/>
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

Answer 2

试试这个：

 <Setter Property="IsSelected" Value="{Binding DataContext.IsSelected, 
RelativeSource={RelativeSource Mode=FindAncestor,AncestorType={x:Type ListBox}}}" />

ListBox“IsSelected”绑定无法正常工作

2 个答案: