ListBox“ IsSelected”綁定不起作用

Question

我一直在尋找高低問題的答案，但是沒有運氣，從中可以看出，我已經擁有所有正確的元素，但是由於某種原因，這並不起作用。

我需要在ListBox中選擇一個項目時運行IsSelected setter。

XAML代碼

<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);
            }
        }
    }

非常感謝，

山姆

Answer 1

ListBoxItem的IsSelected屬性綁定到IsSelected視圖模型屬性，該屬性必須是數據項類型（即“ Activities集合的元素類型）的屬性。

您需要聲明這樣的數據項類，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;
                ...
            }
        }
    }

並按以下方式聲明“ Activities集合：

public ObservableCollection<Activity> { get; set; }

Activity類的Name屬性可以在ListBoxItem的DataTemplate中使用：

<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

嘗試這個 ：

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