得到一个孩子在WPF C＃树视图的父节点 [英] Get the Parent node of a Child in WPF C# TreeView

问题描述

据我所知，编程在C＃中使用WPF是从传统的C＃程序不同，所以大部分的网上材料没有说明我需要什么。

我在我的WPF窗口TreeView控件，我有父节点和子节点在里面。我想将它们存储在类型节点（ID，姓名，父）的列表。

我用这个有选择的项目/节点的名称：

 私人无效TreeViewItem_OnItemSelected（对象发件人，RoutedEventArgs E）
{
    树型视图项目= treeView.SelectedItem为树型视图;
    nameTxt.Text = item.Header.ToString（）;
}
 

和我试着让孩子节点的父立即之前它用这样的：

 树型视图项目= treeView.SelectedItem为树型视图;
nameTxt.Text = item.Parent.ToString（）;
 

不过，这将返回根家长，而不是孩子的父母（A）（也就是2）。

我应该做哪些改变来获得root父母对孩子的直接父呢？ ：）

编辑：下面是XAML

 ＆LT;树视图名称=树视图的Horizo​​ntalAlignment =左的高度=564保证金=10,68,0,0VerticalAlignment =热门WIDTH =363 ＆GT;
     ＆LT;树型视图TreeViewItem.Selected =TreeViewItem_OnItemSelected标题=AIsExpanded =真高度=554字号=18＆GT;
                ＆所述;树型视图部首=1/＆GT;
                ＆LT;树型视图标题=2/＆GT;
     ＆LT; /树型视图＆GT;
＆LT; /树视图＆GT;
 

解决方案

创建了一个小例子来说明你的问题

在 MainWindow.xaml

 ＆LT;树视图名称=树＆GT;
    ＆LT;树视图＆GT;
        ＆LT;树型视图标题=北美选择=TreeViewItem_OnItemSelected＆GT;
            ＆LT;树型视图标题=USA＆GT;
                ＆LT;树型视图标题=纽约/＆GT;
                ＆LT;树型视图标题=拉斯维加斯/＆GT;
                ＆LT;树型视图标题=华盛顿/＆GT;
            ＆LT; /树型视图＆GT;
            ＆LT;树型视图标题=加拿大＆GT;
                ＆LT;树型视图标题=多伦多/＆GT;
                ＆LT;树型视图标题=魁/＆GT;
                ＆LT;树型视图标题=蒙特利尔/＆GT;
            ＆LT; /树型视图＆GT;
            ＆LT;树型视图标题=墨西哥＆GT;＆LT; /树型视图＆GT;
        ＆LT; /树型视图＆GT;
    ＆LT; /树视图＆GT;
＆LT; /树视图＆GT;
 

在code即后面的 MainWindow.xaml.cs

 私人无效TreeViewItem_OnItemSelected（对象发件人，RoutedEventArgs E）
    {
        树型视图项目= e.OriginalSource为树型视图;
        如果（项目！= NULL）
        {
            ItemsControl的父= GetSelectedTreeViewItemParent（项目）;

            树型视图treeitem =父为树型视图;
            字符串myvalue的= treeitem .Header.ToString（）; //获取你的直接父
        }
    }
    公共ItemsControl的GetSelectedTreeViewItemParent（树型视图项）
    {
        DependencyObject的父= VisualTreeHelper.GetParent（项目）;
        而（！（父树型视图||父母是树视图））
        {
            父= VisualTreeHelper.GetParent（父）;
        }

        返回父为ItemsControl的;
    }
 

和它的实现。

I understand that programming in C# with WPF is different from traditional C# procedures so most of the online material do not state what I need.

I have a TreeView control in my WPF Window and I have parent nodes and child nodes in it. I would like to store them in a List of type Node (id, name, parent).

I got the name of the selected item/node using this:

private void TreeViewItem_OnItemSelected(object sender, RoutedEventArgs e)
{
    TreeViewItem item = treeView.SelectedItem as TreeViewItem;
    nameTxt.Text = item.Header.ToString();
}

And I tried getting the Parent of the child node immediately before it using this:

TreeViewItem item = treeView.SelectedItem as TreeViewItem;
nameTxt.Text = item.Parent.ToString();

However, this returns the Root Parent (A) instead of the child's parent (which is 2).

What changes should I make to get the child's immediate parent instead of the root parent? :)

EDIT: Here's the XAML

<TreeView Name="treeView" HorizontalAlignment="Left" Height="564" Margin="10,68,0,0" VerticalAlignment="Top" Width="363">
     <TreeViewItem TreeViewItem.Selected="TreeViewItem_OnItemSelected"  Header="A" IsExpanded="True" Height="554" FontSize="18">
                <TreeViewItem Header="1" />
                <TreeViewItem Header="2" />
     </TreeViewItem>
</TreeView>

解决方案

Created a small example to demonstrate your problem

In MainWindow.xaml

 <TreeView Name="tree">
    <TreeView>
        <TreeViewItem Header="North America" Selected="TreeViewItem_OnItemSelected">
            <TreeViewItem Header="USA">
                <TreeViewItem Header="New York"/>
                <TreeViewItem Header="Las Vegas"/>
                <TreeViewItem Header="Washington"/>
            </TreeViewItem>
            <TreeViewItem Header="Canada">
                <TreeViewItem Header="Toronto"/>
                <TreeViewItem Header="Quebec"/>
                <TreeViewItem Header="Montreal"/>
            </TreeViewItem>
            <TreeViewItem Header="Mexico"></TreeViewItem>
        </TreeViewItem>
    </TreeView>
</TreeView>

in Code Behind i.e MainWindow.xaml.cs

 private void TreeViewItem_OnItemSelected(object sender, RoutedEventArgs e)
    {
        TreeViewItem item = e.OriginalSource as TreeViewItem;
        if (item != null)
        {
            ItemsControl parent = GetSelectedTreeViewItemParent(item);

            TreeViewItem treeitem = parent as TreeViewItem;
            string MyValue= treeitem .Header.ToString();//Gets you the immediate parent
        }
    }
    public ItemsControl GetSelectedTreeViewItemParent(TreeViewItem item)
    {
        DependencyObject parent = VisualTreeHelper.GetParent(item);
        while (!(parent is TreeViewItem || parent is TreeView))
        {
            parent = VisualTreeHelper.GetParent(parent);
        }

        return parent as ItemsControl;
    }

And its done.

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