我有一个绑定到XML数据源的ASP.NET TreeView控件。我希望能够控制哪些节点被扩展,哪些节点被折叠到xml定义文件中。但是扩展的=“”对我不起作用。在下面的简单示例中,我希望节点2完全展开。
ASP页面…

<asp:XmlDataSource ID="oXmlDataSource" runat="server" />
<asp:TreeView ID="TreeView1" runat="server" EnableViewState="false" DataSourceID="oXmlDataSource"></TreeView>

代码隐藏…
oXmlDataSource.Data = MyXMLString;
oXmlDataSource.XPath = "/Tree/Node";

这是XML…
<?xml version='1.0' encoding='utf-8' ?>
<Tree Text='example.aspx' Href='example.aspx'>
      <Node Text='Example Node 1' Href='0800200c9a66.aspx' Expanded='false'></Node>
      <Node Text='Example Node 2' Href='0800200c9a66.aspx' Expanded='true'>
         <Node Text='Example Node 3' Href='0800200c9a66.aspx' Expanded='false'></Node>
         <Node Text='Example Node 4' Href='0800200c9a66.aspx' Expanded='false'></Node>
         <Node Text='Example Node 5' Href='0800200c9a66.aspx' Expanded='false'></Node>
         <Node Text='Example Node 6' Href='0800200c9a66.aspx' Expanded='false'></Node>
      </Node>
</Tree>

最佳答案

不幸的是,在xml中不能这样做。这是一个短暂的控制。您需要用xml填充treeview,然后递归地遍历所有节点并展开所需的分支。请尝试以下操作:
将onprerender attrobite添加到treeview控件…

<asp:XmlDataSource ID="oXmlDataSource" runat="server" />
<asp:TreeView ID="TreeView1" runat="server" EnableViewState="false" DataSourceID="oXmlDataSource" OnPreRender="TreeView1_PreRender"></TreeView>

然后在代码后面添加以下内容(我建议添加一些测试并添加try/catch)。
protected void TreeView1_PreRender(object sender, EventArgs e)
{
    SelectCurrentPageTreeNode(TreeView1);
}

private void SelectCurrentPageTreeNode(TreeView tvTreeView)
{
    tvTreeView.CollapseAll();

    if (Request.Url.PathAndQuery != null)
    {
        ExpandTreeViewNodes(tvTreeView, Request.Url.PathAndQuery);
    }
}

private TreeNode ExpandTreeViewNodes(TreeView tvTreeView, string sPathAndQuery)
{
    if (tvTreeView != null)
    {
        if (!string.IsNullOrEmpty(sPathAndQuery))
        {
            sPathAndQuery = sPathAndQuery.ToLower();
            {
                TreeNode tnWorkTreeNode = null;

                for (int iLoop = 0; iLoop < tvTreeView.Nodes.Count; iLoop++)
                {
                    tvTreeView.Nodes[iLoop].Expand();

                    tvTreeView.Nodes[iLoop].Selected = true;
                    if (tvTreeView.Nodes[iLoop].NavigateUrl.ToLower() == sPathAndQuery)
                    {
                        return (tvTreeView.Nodes[iLoop]);
                    }
                    else
                    {
                        tnWorkTreeNode = ExpandTreeViewNodesR(tvTreeView.Nodes[iLoop], sPathAndQuery);
                    }

                    if (tnWorkTreeNode != null)
                    {
                        return (tnWorkTreeNode);
                    }

                    tvTreeView.Nodes[iLoop].Collapse();
                }
            }
        }
    }

    return (null);
}

private static TreeNode ExpandTreeViewNodesR(TreeNode tvTreeNode, string sPathAndQuery)
{
    TreeNode tnReturnTreeNode = null;

    if (tvTreeNode != null)
    {
        tvTreeNode.Expand();
        if (tvTreeNode.NavigateUrl.ToLower() == sPathAndQuery)
        {
            return (tvTreeNode);
        }
        else
        {
            tnReturnTreeNode = null;

            for (int iLoop = 0; iLoop < tvTreeNode.ChildNodes.Count; iLoop++)
            {
                tvTreeNode.ChildNodes[iLoop].Selected = true;
                tnReturnTreeNode = ExpandTreeViewNodesR(tvTreeNode.ChildNodes[iLoop], sPathAndQuery);

                if (tnReturnTreeNode != null)
                {
                    return (tnReturnTreeNode);
                }
            }
            tvTreeNode.Collapse();
        }
    }
    return (null);
}

09-30 17:47
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