从WPF中的列表框中获取复选框项

Question

我正在开发WPF应用程序。我以下列方式将CheckBoxes添加到ListBox。

foreach (User ls in lst)
{
     AddContacts(ls, lstContactList);
}

private void AddContacts(User UserData, ListBox lstbox)
{
    try
    {
        var txtMsgConversation = new CheckBox()
        {

                Padding = new Thickness(1),
                IsEnabled = true,
                //IsReadOnly = true,
                Background = Brushes.Transparent,
                Foreground = Brushes.White,
                Width = 180,
                Height = 30,
                VerticalAlignment = VerticalAlignment.Top,
                VerticalContentAlignment = VerticalAlignment.Top,
                Content = UserData.Name, //+ "\n" + UserData.ContactNo,
                Margin = new Thickness(10, 10, 10, 10)
        };

        var SpConversation = new StackPanel() { Orientation = Orientation.Horizontal };

        SpConversation.Children.Add(txtMsgConversation);

        var item = new ListBoxItem()
        {
                Content = SpConversation,
                Uid = UserData.Id.ToString(CultureInfo.InvariantCulture),
                Background = Brushes.Black,
                Foreground = Brushes.White,
                BorderThickness = new Thickness(1),
                BorderBrush = Brushes.Gray
        };


        item.Tag = UserData;

        lstbox.Items.Add(item);
    }
    catch (Exception ex)
    {
        //Need to log Exception
    }
}

现在我需要从ListBox获取已检查的项目。我如何继续这里，我尝试下面的代码，返回null，

CheckBox chkBox = lstContactList.SelectedItem as CheckBox;

任何建议，

此致 桑杰塔

Answer 1

在列表框中创建动态多项的方法不是代码隐藏，而是为项创建模板，然后将其绑定到项列表。

示例

说我有一堆段落List<Passage> Passages { get; set; }：

public class Passage
{
  public string Name { get; set; }
  public bool IsSelected { get; set; }
}

在我的xaml中，我创建了一个模板并绑定到它

<ListBox ItemsSource="{Binding Passages}">
    <ListBox.ItemTemplate>
        <DataTemplate>
            <StackPanel  Orientation="Horizontal">
                <CheckBox IsChecked="{Binding IsSelected, Mode=TwoWay}" />
                <TextBlock Text="{Binding Path=Name, StringFormat=Passage: {0}}"
                           Foreground="Blue" />
            </StackPanel>
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

结果在我的四个段落中看起来像这样＃34; Alpha＆＃34;，＆＃34; Beta＆＃34;，＆＃34; Gamma＆＃34;和＆＃34; I-25＆＃34;：

然后，如果我想要所选项目，例如上面最近检查的Beta，我只列举所选项目的列表。

 var selecteds = Passages.Where(ps => ps.IsSelected == true);

需要在一个ListBox中列出不同类型的对象吗？从绑定到复合集合或ObservableCollection<T>说？

在这里查看我的答案：

• Composite Collection
• ObservableCollection