如何在WPF CheckBox ListBox中獲取選定項

Question

使用列表框項目中的復選框，如何從列表中獲取選定的復選框

<ListBox ItemsSource="{Binding NameList}"  HorizontalAlignment="Left" Margin="16,68,0,12" Name="listBox1" Width="156" IsEnabled="True" SelectionMode="Multiple" Focusable="True" IsHitTestVisible="True" IsTextSearchEnabled="False" FontSize="12" Padding="5" SelectionChanged="listBox1_SelectionChanged">
            <ListBox.ItemTemplate>
                <DataTemplate> 
                        <StackPanel Orientation="Horizontal">                      
                               <CheckBox Content="{Binding Path=CNames}" />
                        </StackPanel>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>

我試圖遍歷listboxitems中的選定項目，但是在listboxitem中引發異常

 private void btnSelected(object sender, RoutedEventArgs e)
    {
        foreach (ListBoxItem item in listBox1.Items)
        {
            if (item.ToString() == "true")
            {
                MessageBox.Show(item.Content.ToString());
            }
        }
    }

Answer 1

您可以將這些項目中的每一個的數據上下文從UI移開，並創建對象的ObservableCollection

public ObservableCollection<CheckedItem> List { get;set;}

public class CheckedItem : INotifyPropertyChanged
{
  private bool selected;
  private string description;

  public bool Selected 
  { 
     get { return selected; }
     set 
     {
        selected = value;
        OnPropertyChanged("Selected");
     }
  }

  public string Description 
  { 
     get { return description; }
     set
     {
         description = value;
         OnPropertyChanged("Description");
     }
   }

  /* INotifyPropertyChanged implementation */
}

然后在您的ListBox ItemTemplate中

<ItemTemplate>
  <DataTemplate>
    <CheckBox IsChecked="{Binding Path=Selected}" 
              Content={Binding Path=Description}" />
  </DataTemplate>
</ItemTemplate>

您選擇的項目現在可以在ObservableCollection中使用，而不是遍歷UI元素

Answer 2

有這樣的模板

<ListBox.ItemTemplate>
   <DataTemplate> 
 ........
   <CheckBox Content="" 
      IsChecked="{Binding IsSelected, Mode=TwoWay,
      RelativeSource={RelativeSource FindAncestor, 
      AncestorType={x:Type ListViewItem}}}"  />
 ..........
    <!-- Use Other UIElements to Show your Data -->

那么上面的綁定將與模型同步isSelected和列表視圖選擇兩種方式，然后在代碼中使用SelectedItems。

For Each s As myPoco In myListView1.SelectedItems
   ' do something here with
Next

Answer 3

我建議這段代碼：

 private void save_Click(object sender, RoutedEventArgs e)
 {
     foreach (CheckBox item in list1.Items)
     {
         if (item.IsChecked)
         {
             MessageBox.Show(item.Content.ToString());
         }
     }
 }