Question

我在silverlight app中使用手风琴。在accordionItem我有一个列表框，我需要访问扩展的手风琴项目和手风琴的这个列表框。

我很难找到手风琴和它所持有的列表框。我该怎么做呢？

我试图解决的是使用以下扩展类：

public static IEnumerable<DependencyObject> GetVisuals(this DependencyObject root)
{
  int count = VisualTreeHelper.GetChildrenCount(root);
  for (int i = 0; i < count; i++)
  {
    var child = VisualTreeHelper.GetChild(root, i);
    yield return child;
    foreach (var descendants in child.GetVisuals())
    {
      yield return descendants;
    }
  }
}

然后把它叫作我的手风琴：

    foreach (var control in MyAccordion.GetVisuals().OfType<ListBox>())
    {
      // Do something with the listbox 
    }

不幸的是，即使没有OfType扩展方法，当在扩展方法中调用GetChildrenCount时，Accordion报告为0。

更新

我找到了一种使用以下代码访问AccordionItem的方法

    int selectedIndex = OrganiChartAccordion.SelectedIndex;
    AccordionItem accordionItem = OrganiChartAccordion.ItemContainerGenerator.ContainerFromIndex(selectedIndex) as AccordionItem;

在AccordionItem中，我使用DataTemplate来渲染数据。在DataTemplate中，我有两个列表框。我需要访问所选择的accordionitem中的数据模板，并在datatemplate中访问两个列表框。

Answer 1

试试这个：

<UserControl x:Class="SilverlightApplication10.MainPage"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:layout="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Layout.Toolkit"
             mc:Ignorable="d"
             d:DesignHeight="300"
             d:DesignWidth="400">

    <Grid x:Name="LayoutRoot"
          Background="White">
        <layout:Accordion x:Name="Accordion1">
            <layout:Accordion.Items>
                <layout:AccordionItem Header="Header 1">
                    <ListBox>
                        <ListBox.Items>
                            <ListBoxItem Content="Item 1"></ListBoxItem>
                            <ListBoxItem Content="Item 2"></ListBoxItem>
                            <ListBoxItem Content="Item 3"></ListBoxItem>
                        </ListBox.Items>
                    </ListBox>
                </layout:AccordionItem>
                <layout:AccordionItem Header="Header 2">
                    <ListBox>
                        <ListBox.Items>
                            <ListBoxItem Content="Item 1"></ListBoxItem>
                            <ListBoxItem Content="Item 2"></ListBoxItem>
                            <ListBoxItem Content="Item 3"></ListBoxItem>
                        </ListBox.Items>
                    </ListBox>
                </layout:AccordionItem>
            </layout:Accordion.Items>
        </layout:Accordion>
    </Grid>
</UserControl>

代码隐藏：

using System;
using System.Diagnostics;
using System.Linq;
using System.Windows;
using System.Windows.Controls;

namespace SilverlightApplication10
{
    public partial class MainPage : UserControl
    {
        public MainPage()
        {
            InitializeComponent();

            this.Loaded += MainPage_Loaded;
        }

        void MainPage_Loaded(object sender, RoutedEventArgs e)
        {
            Accordion1.Items.ToList().ForEach(item =>
                {
                    ((item as AccordionItem).Content as ListBox).Items.ToList().ForEach(listBoxItem =>
                        {
                            var content = ((ListBoxItem)listBoxItem).Content;

                            Debug.WriteLine(content);
                        });
                });
        }
    }
}

如何以编程方式访问手风琴的Accordion项目？

1 个答案: