Question

我正在创建一个使用此XAML代码绑定到XML文件（或其他方式..）的WPF TreeView

<UserControl x:Class="XmlOutline.OutlineWindowControl"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             xmlns:vsshell="clr-namespace:Microsoft.VisualStudio.Shell;assembly=Microsoft.VisualStudio.Shell.15.0"
             Background="{DynamicResource {x:Static vsshell:VsBrushes.WindowKey}}"
             Foreground="{DynamicResource {x:Static vsshell:VsBrushes.WindowTextKey}}"
             mc:Ignorable="d"
             d:DesignHeight="300" d:DesignWidth="300"
             Name="MyToolWindow">
    <UserControl.Resources>
        <XmlDataProvider x:Key="XmlProvider" Source="LogansTest.xml" XPath="/Items"/>
        <HierarchicalDataTemplate x:Key="NodeTemplate" ItemsSource="{Binding XPath=./*}">
            <TextBlock x:Name="nodetext"/>
            <HierarchicalDataTemplate.Triggers>
                <DataTrigger Binding="{Binding Path=NodeType}" Value="Element">
                    <Setter TargetName="nodetext" Property="Text" Value="{Binding Path=Name}"/>
                </DataTrigger>
            </HierarchicalDataTemplate.Triggers>
        </HierarchicalDataTemplate>
    </UserControl.Resources>


    <Grid x:Name="TreeGrid" DataContext="XmlProvider">
        <Grid.RowDefinitions>
            <RowDefinition />
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>

        <TreeView Name="TreeItems"
                  ItemTemplate="{StaticResource NodeTemplate}"
                  HorizontalAlignment="Stretch"
                  VerticalAlignment="Stretch"
                  ItemsSource="{Binding}"
                  VirtualizingStackPanel.IsVirtualizing="False"
                  VirtualizingStackPanel.VirtualizationMode="Standard">
        </TreeView>
    </Grid>
</UserControl>

我正在设置像这样的Xml上下文

var provider = new XmlDataProvider()
{
Source = new Uri(gotFocus.Document.Path + gotFocus.Document.Name), XPath = "./*"
};

OutlineWindowInstance.TreeItems.DataContext = provider;

然后我编辑Xml文件并保存我调用的更改

var prov = (XmlDataProvider) OutlineWindowInstance.TreeItems.DataContext;
prov.Refresh();

这更新树视图很棒，但它也会收缩所有节点，而不是记住IsExpanded状态。我无法弄清楚如何让它记住这个状态，有人能指出我正确的方向吗？：）

Answer 1

请尝试以下操作：

       public Form1()
        {
            InitializeComponent();

            TreeNode newNode1 = new TreeNode("Node 1");
            treeView1.Nodes.Add(newNode1);

            TreeNode newNode1a = new TreeNode("Node 1a");
            newNode1.Nodes.Add(newNode1a);
            treeView1.Click += new EventHandler(treeView1_Click);


            TreeNode newNode2 = new TreeNode("Node 2");
            treeView1.Nodes.Add(newNode2);


            TreeNode newNode3 = new TreeNode("Node 3");
            treeView1.Nodes.Add(newNode3);



        }
        void treeView1_Click(object sender, EventArgs e)
        {
            TreeView  node = sender as TreeView;
            if (node != null)
            {
                TreeNode selectedNode = node.SelectedNode;
                string nodeName = selectedNode.Name;
                Boolean expanded = selectedNode.IsExpanded;
            }
        }

Treeview在刷新时记得IsExpanded

1 个答案: