Question

我遇到了一个问题我不知道是否有可能阻止它。我认为默认设计是这样的。

我编写了一个由XML填充的树视图列表，每个节点在选中时都填充了一些文本框。根据其类型，它将触发不同的功能。

问题在于，当我选择一个孩子时，它似乎会触发所有父母treeviewitem的“IsSelecting”一直到顶部，这反过来触发了相关的功能，我不希望这样。

任何想法如何防止IsSelected的这种“反向继承的排序”？

示例（使用下面的代码检查）：选择“节点”将触发“Node_Selected”，“Dialog_Selected”，“Actor_Selected”。

感谢您的帮助。

致以最诚挚的问候，

仅供上下文使用

    private void Window_Loaded(object sender, RoutedEventArgs e)
    {
        XmlDocument document = new XmlDocument();
        document.Load("XML/ActorsDialogs.xml");

        XmlNodeList actors = document.SelectNodes("/dialogs/actor");

        foreach (XmlNode actor in actors)
        {
            TreeViewItem newActor = new TreeViewItem();
            newActor.Header = actor.SelectSingleNode("actorname").InnerText;
            newActor.Selected += new RoutedEventHandler(Actor_Selected);

            XmlNodeList dialogs = actor.SelectNodes("dialog");
            foreach (XmlNode dialog in dialogs)
            {
                TreeViewItem newdialog = new TreeViewItem();
                newdialog.Header = "Dialog:" + dialog.SelectSingleNode("dialogID").InnerText;
                newdialog.Selected += new RoutedEventHandler(Dialog_Selected);

                BuildNodes(newdialog, dialog);

                newActor.Items.Add(newdialog);
            }
            ActorsList.Items.Add(newActor);
        }
    }

    private void BuildNodes(TreeViewItem treeNode, XmlNode parentElement)
    {
        foreach (XmlNode child in parentElement.ChildNodes)
        {
            if (child.Name == "node" || child.Name == "reply")
            {
                XmlElement childElement = child as XmlElement;
                TreeViewItem childTreeNode = new TreeViewItem();
                string ID = child.SelectSingleNode(child.Name + "ID").InnerText;
                childTreeNode.Header = childElement.Name + ":" + ID;
                switch (child.Name)
                {
                    case "node":
                        childTreeNode.Selected += new RoutedEventHandler(Node_Selected);
                        break;
                    case "reply":
                        childTreeNode.Selected += new RoutedEventHandler(Reply_Selected);
                        break;
                    default:
                        break;
                }


                treeNode.Items.Add(childTreeNode);
                BuildNodes(childTreeNode, childElement);
            }
        }
    }

     private void Actor_Selected(object sender, RoutedEventArgs e){}
     private void Dialog_Selected(object sender, RoutedEventArgs e){}
     private void Node_Selected(object sender, RoutedEventArgs e){}
     private void Reply_Selected(object sender, RoutedEventArgs e){}

Answer 1

在事件处理程序中，您可以设置e.Handled = true。这样可以防止事件冒泡到树上。

private void Node_Selected(object sender, RoutedEventArgs e)
{
   e.Handled = true; //this will prevent the event from bubbling up to parents;
   //Do the rest of the code here.
}

有关RoutedEvents的更多信息，请参阅https://msdn.microsoft.com/en-us/library/ms742806%28v=vs.110%29.aspx。这些活动包括树上的冒泡活动和沿树下的隧道活动。

WPF IsSelected在选择子项时阻止触发

1 个答案: