ListBox "IsSelected" 绑定不起作用

Question

我到处搜索这个问题的答案，但没有成功，据我所知，我已经准备好了所有正确的元素，但由于某种原因，这不起作用。

当在列表框中选择一个项目时，我需要 IsSelected setter 到运行。

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# 视图模型

 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，

山姆

Answer 1

ListBoxItem的IsSelected属性绑定到IsSelected视图模型属性，必须是属性的数据项类型，即 Activities 集合的元素类型。

您需要声明这样的数据项class，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;
                ...
            }
        }
    }

并像这样声明 Activities 集合：

public ObservableCollection<Activity> { get; set; }

Activity class 的 Name 属性可以用在 ListBoxItem 的数据模板中：

<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" 绑定不起作用

ListBox "IsSelected" binding not working

c#

wpf

listbox