将ItemsControl.Items枚举为UIElements

Question

我有一个通过a显示的超链接列表ItemsControl,如下所示:

 <ItemsControl x:Name="SubMenu" Visibility="Collapsed">
        <ItemsControl.ItemTemplate>
            <DataTemplate>
                <HyperlinkButton Content="{Binding Name}"
                                 NavigateUri="{Binding Url}"
                                 TargetName="ContentFrame"
                                 Style="{StaticResource LinkStyle}"
                                 />
            </DataTemplate>
        </ItemsControl.ItemTemplate>
        <ItemsControl.ItemsPanel>
            <ItemsPanelTemplate>
                <StackPanel Style="{StaticResource LinksStackPanelStyle}"
                            VerticalAlignment="Center"
                            HorizontalAlignment="Left" />
            </ItemsPanelTemplate>
        </ItemsControl.ItemsPanel>
    </ItemsControl>

我需要做的是枚举子菜单中的实际超链接,如下所示:

    foreach (UIElement child in SubMenu.Items) // this does not work!
    {
        HyperlinkButton hb = child as HyperlinkButton;
        if (hb != null && hb.NavigateUri != null)
        {
            if (hb.NavigateUri.ToString().Equals(e.Uri.ToString()))
            {
                VisualStateManager.GoToState(hb, "ActiveLink", true);
            }
            else
            {
                VisualStateManager.GoToState(hb, "InactiveLink", true);
            }
        }
    }

问题是我似乎找不到枚举ItemsCollection.Items中实际UI元素的方法.

任何人都知道如何做到这一点或可能的解决方法？

我可以提一下,我想要做的是建立一个菜单和子菜单,显示点击的超链接作为一种面包屑.

更新: 最好的事情是,如果我能以某种方式到达该stackpanel,因为这段代码似乎工作:

    foreach (UIElement child in LinksStackPanel.Children)
    {
        HyperlinkButton hb = child as HyperlinkButton;
        if (hb != null && hb.NavigateUri != null)
        {
            if (hb.NavigateUri.ToString().Equals(e.Uri.ToString()))
            {
                VisualStateManager.GoToState(hb, "ActiveLink", true);
            }
            else
            {
                VisualStateManager.GoToState(hb, "InactiveLink", true);
            }
        }
    }

Answer 1

解决方案如下所示:

foreach (var item in SubMenu.Items)
{
    var hb = SubMenu.ItemContainerGenerator.ContainerFromItem(item).FindVisualChild<HyperlinkButton>();

    if (hb.NavigateUri.ToString().Equals(e.Uri.ToString()))
    {
        VisualStateManager.GoToState(hb, "ActiveLink", true);
    }
    else
    {
        VisualStateManager.GoToState(hb, "InactiveLink", true);
    }
}

扩展方法FindVisualChild:

public static T FindVisualChild<T>(this DependencyObject instance) where T : DependencyObject
{
    T control = default(T);

    if (instance != null)
    {

        for (int i = 0; i < VisualTreeHelper.GetChildrenCount(instance); i++)
        {
            if ((control = VisualTreeHelper.GetChild(instance, i) as T) != null)
            {
                break;
            }

            control = FindVisualChild<T>(VisualTreeHelper.GetChild(instance, i));
        }
    }

    return control;

}