从选定的ListBoxItem模板获取文本块值

private void GetSelectedTextBlockValue()
{
    ListBoxItem selectedListBoxItem = GetSelectedListBoxItem(listBox);

    if (selectedListBoxItem != null)
    {
        TextBlock textBlock = FindChild<TextBlock>(selectedListBoxItem);
        if (textBlock != null)
        {
            string textBlockValue = textBlock.Text;
            // 在这里使用获取到的文本块值进行后续操作
        }
    }
}

private ListBoxItem GetSelectedListBoxItem(ListBox listBox)
{
    if (listBox.SelectedItem != null)
    {
        ListBoxItem listBoxItem = listBox.ItemContainerGenerator.ContainerFromItem(listBox.SelectedItem) as ListBoxItem;
        return listBoxItem;
    }
    return null;
}

private T FindChild<T>(DependencyObject parent) where T : DependencyObject
{
    if (parent == null)
        return null;

    for (int i = 0; i < VisualTreeHelper.GetChildrenCount(parent); i++)
    {
        var child = VisualTreeHelper.GetChild(parent, i);

        T childType = child as T;
        if (childType != null)
        {
            return childType;
        }

        T result = FindChild<T>(child);
        if (result != null)
            return result;
    }
    return null;
}