代码段

using System.Xml.Linq;

//写xml  这样循环写入xml 都写到根节点上去了，没有找到哪里的问题

 private void WriteXML(TreeView t, string path)
        {

            XDocument xdoc = new XDocument();           
            TreeNode tn = t.Nodes[0];
            XElement xe = new XElement(GetStr(tn.Text));
            xe.Value = tn.Tag.ToString();
            xdoc.Add(xe);
            WriteXMLC(tn, xe);

            xdoc.Save(path);

        }

 private void WriteXMLC(TreeNode tn, XElement xe)
        {
            foreach (TreeNode node in tn.Nodes)
            {
                XElement xec = new XElement(GetStr(node.Text));

                xec.Value = node.Tag.ToString();
                xe.Add(xec);

                if (node.Nodes.Count > 0)
                {
                    WriteXMLC(node, xec);
                }
                Console.WriteLine(node.Text );
            }
        }

//读xml  

 private void LoadXml(string path, TreeView t)
        {
            //根节点
            XDocument xdoc = XDocument.Load(path);
            XElement xe = xdoc.Root;
            TreeNode tn = new TreeNode();
            tn.Text = GetXMLValueName(xe.Value);
            Console.WriteLine(xe.Value );
            tn.Tag = xe.Value;
            t.Nodes.Add(tn);
            //加载子节点
            LoadXmlC(xe, tn);
            }

 private void LoadXmlC(XElement xe, TreeNode tn)
        {
            foreach (XElement item in xe.Elements())
            {
                TreeNode tnc = new TreeNode();
                tnc.Text = GetXMLValueName(item.Value);
                tnc.Tag = item.Value;
                tn.Nodes.Add(tnc);
                if (item.Elements().Count() > 0)
                {
                    LoadXmlC(item, tnc);
                }
            }
        }