C# 如何从列表框中获取项目容器（例如stackpanel）

我有这样的代码

<ListBox x:Name="filterListBox" Height="60">
    <ListBox.ItemsPanel>
        <ItemsPanelTemplate>
            <StackPanel Orientation="Horizontal" 
                        VirtualizingStackPanel.VirtualizationMode="Standard"/>
        </ItemsPanelTemplate>
    </ListBox.ItemsPanel>
    <ListBox.ItemTemplate>
        <DataTemplate>
            <StackPanel x:Name="TargetPanel">
            </StackPanel>
        </DataTemplate>
    </ListBox.ItemTemplate>
    <ListBox.Background>
        <SolidColorBrush />
    </ListBox.Background>
</ListBox>

---

现在我需要一个名为TargetPanel的stackpanel，但我不知道怎么做。您能帮忙吗。

不幸的是，没有一种内置的方法可以通过简单的方法调用来实现这一点。然而，这很容易。通过对示例进行一些修改，您可以按名称获取DataTemplate的特定子级：

需要添加的代码可能位于帮助器类中：

using System.Windows.Media;   // for VisualTreeHelper

private static TChildItem FindVisualChild<TChildItem>(DependencyObject obj, 
    string matchName = "") where TChildItem : DependencyObject
{
    for (int i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++)
    {
    var child = VisualTreeHelper.GetChild(obj, i);
        if (child != null && child is TChildItem)
        {
            // match by name
        var childName = child.GetValue(FrameworkElement.NameProperty) as string;
        if (!string.IsNullOrWhiteSpace(matchName))
        {
                if (matchName == childName) 
                {
                return (TChildItem)child;
                }
        } 
            else 
            {
                return (TChildItem)child;
            }       
        }
        else
        {
        var childOfChild = FindVisualChild<TChildItem>(child, matchName);
        if (childOfChild != null)
        {
            return childOfChild;
        }
        }
    }
    return null;
}

// the call
var item = filterListBox.ItemContainerGenerator
               .ContainerFromIndex(0) as ListBoxItem;
var sp = FindVisualChild<StackPanel>(item, "TargetPanel");
// the variable sp should be set to the TargetPanel for the item now 

using System.Windows.Media;   // for VisualTreeHelper

private static TChildItem FindVisualChild<TChildItem>(DependencyObject obj, 
    string matchName = "") where TChildItem : DependencyObject
{
    for (int i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++)
    {
    var child = VisualTreeHelper.GetChild(obj, i);
        if (child != null && child is TChildItem)
        {
            // match by name
        var childName = child.GetValue(FrameworkElement.NameProperty) as string;
        if (!string.IsNullOrWhiteSpace(matchName))
        {
                if (matchName == childName) 
                {
                return (TChildItem)child;
                }
        } 
            else 
            {
                return (TChildItem)child;
            }       
        }
        else
        {
        var childOfChild = FindVisualChild<TChildItem>(child, matchName);
        if (childOfChild != null)
        {
            return childOfChild;
        }
        }
    }
    return null;
}