更改列表框选择更改上的项目复选框

Question

我有一个由 ItemTemplate 和 Binding 创建的 ListBox

        <controls:PanoramaItem Header="{Binding AppResources.SettingsSubpage2, Source={StaticResource LocalizedStrings}}" HeaderTemplate="{StaticResource HeaderTemplate}">
            <Grid>
                <ListBox x:Name="DayOfWeekSelector" ItemTemplate="{StaticResource DayOfWeekTemplate}" ItemsSource="{Binding DayOfWeekElementList}" Foreground="{StaticResource AppForegroundColor}" LostFocus="DayOfWeekSelector_LostFocus" HorizontalAlignment="Left" Width="420" />
            </Grid>
        </controls:PanoramaItem>

模板代码：

<phone:PhoneApplicationPage.Resources>
   <!--- ... --->
<DataTemplate x:Key="DayOfWeekTemplate">
        <Grid Height="65" Width="332">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="60"/>
                <ColumnDefinition Width="*"/>
            </Grid.ColumnDefinitions>
            <CheckBox IsChecked="{Binding IsActive, Mode=TwoWay}" Tag="{Binding}" d:LayoutOverrides="Width, Height" BorderBrush="{StaticResource AppBackgroundColor}" Background="{StaticResource ScheduleBackgroundAccentsColor}" Grid.Column="0" Unchecked="CheckBox_Unchecked" />
            <StackPanel Grid.Column="1" Orientation="Horizontal">
            <TextBlock Text="{Binding Name}" VerticalAlignment="Center"  d:LayoutOverrides="Width"/>
                <TextBlock Text="{Binding TaskCounter, Mode=OneWay, Converter={StaticResource DayOfWeekCounter}}" HorizontalAlignment="Left" VerticalAlignment="Center" Margin="10,0,0,0"/>
            </StackPanel>
        </Grid>
    </DataTemplate>
   <!--- ... --->

而且它运行良好。我的所有物品都在清单上。复选框绑定到适当的元素（单击它会更改适当的值）。

但默认情况下也可以选择 ListBox。选择高亮 TextBox 绑定到 Name 但不更改 CheckBox（绑定到 IsActive）。如何将项目选择更改绑定到复选框状态更改（在 Silverlight 中）？

编辑：

public partial class SettingsPage : PhoneApplicationPage, INotifyPropertyChanged
{

    public event PropertyChangedEventHandler PropertyChanged;
    private void NotifyPropertyChanged(string info)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(info));
        }
    }

    public List<DayOfWeekElement> DayOfWeekList
    {
        get
        {
            return CyberSyncPlanBase.Instance.DayOfWeekElementList;
        }
        set
        {
            CyberSyncPlanBase.Instance.DayOfWeekElementList = value;
            NotifyPropertyChanged("DayOfWeekList");
        }
    }

   public SettingsPage()
    {
        InitializeComponent();
        DayOfWeekSelector.DataContext = CyberSyncPlanBase.Instance;

    }

 private void DayOfWeekSelector_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        DayOfWeekElement dowe = (DayOfWeekElement) DayOfWeekSelector.SelectedItem;

        if (dowe != null)
            dowe.IsActive = (dowe.IsActive) ? false : true;
    }

在单例 INotifyPropertyChanged 中，我以同样的方式实现：

    private List<DayOfWeekElement> dayOfWeekElementList;
    public List<DayOfWeekElement> DayOfWeekElementList 
    { 
        get { return dayOfWeekElementList; }
        set 
        { 
        dayOfWeekElementList = value;
        RecalcWeekTasks();
        NotifyPropertyChanged("DayOfWeekElementList");
        } 
    }

底层：

public class DayOfWeekElement
{
    public string Name { get { return this.DayOfWeek.ToStringValue(); } }
    public bool IsNotEmpty { get { return (TaskCounter > 0); } }
    public int TaskCounter { get; set; }
    public bool IsActive { get; set; }
    public DayOfWeek DayOfWeek { get; set; }
}

Answer 1

我认为你可以使用 ListBox 控件的SelectedItem 属性。

一个可能的实现可能是这样的：

1. 订阅ListBox的SelectedIndexChanged事件。
2. 获取所选项目。
3. 对于所选项目，将其IsActive 属性更改为true。

如果接口 INotifyPropertyChanged 在您的数据类中实现，则此方法有效。

例如：

public class DayOfWeekElement : INotifyPropertyChanged
{
   public event PropertyChangedEventHandler PropertyChanged;

   private void NotifyPropertyChanged(string propertyName)
   {
       if (PropertyChanged != null)
       {
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
       }
   }


   private bool isActive = false;
   public bool IsActive { 
      get
      {
          return this.isActive;
      } 
      set
      {
          if (value != this.isActive)
          {
             this.isActive= value;
             NotifyPropertyChanged("IsActive");
          }
      }  
   }
}