将TreeView中导出为XML数据

//使用范例：
TreeViewToXmlB m_TreeViewToXmlB = new TreeViewToXmlB();
m_TreeViewToXmlB.exportToXml(this.TreeView1,Server.MapPath(@".\xml.xml"));

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using System;
using Microsoft.Web.UI.WebControls;
using System.Collections;
using System.IO;
//using System.Windows.Forms;

namespace treeview_DB
{
/// <summary>
/// 将TreeView中导出为XML数据
/// </summary>
public class TreeViewToXmlB
{
  //XML每行的内容
  private string xmlLine = "";
  //用于写XML文件
  private StreamWriter sr;

  //// <summary>
  /// 构造函数
  /// </summary>
  public TreeViewToXmlB()
  {

  }

  /// <summary>
  /// 将TreeView中导出为XML数据
  /// </summary>
  /// <param name="tv">TreeView控件</param>
  /// <param name="filename">XML文件的保存路径</param>
  public void exportToXml(TreeView tv, string filename)
  {
   sr = new StreamWriter(filename, false, System.Text.Encoding.UTF8);
   //写文件头部内容
   //下面是生成RSS的OPML文件
   sr.WriteLine("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
   sr.WriteLine("<opml version=\"1.0\">");
   sr.WriteLine("<head>");
   sr.WriteLine("<title>RSS</title>");
   sr.WriteLine("</head>");
   sr.WriteLine("<body>");

   //遍历根节点
   foreach (TreeNode node in tv.Nodes)
   {
    if (node.Nodes.Count == 0)
    {
     xmlLine = GetRSSText(node);
    }
    else
    {
     xmlLine = GetDirectoryText(node);
    }

sr.WriteLine(xmlLine);

    //递归遍历节点
    parseNode(node);
   }

   //写文件尾部内容
   sr.WriteLine("</body>");
   sr.WriteLine("</opml>");
   sr.Close();
  }

  //递归遍历节点内容,最关键的函数
  private void parseNode(TreeNode tn)
  {
   IEnumerator ie = tn.Nodes.GetEnumerator();

   while (ie.MoveNext())
   {
    TreeNode ctn = (TreeNode) ie.Current;

    //为最底层节点,即该节点为RSS节点
    if (ctn.Nodes.Count == 0)
    {
     xmlLine = GetRSSText(ctn);
     sr.WriteLine(xmlLine);
    }
    else//不是最底层节点,即该节点为目录节点
    {
     xmlLine = GetDirectoryText(ctn);
     sr.WriteLine(xmlLine);
    }

    //如果还有子节点则继续遍历
    if (ctn.Nodes.Count > 0)
    {
     parseNode(ctn);
    }
   }

sr.WriteLine("</outline>");
}

  //成生RSS节点的XML文本行
  private string GetRSSText(TreeNode node)
  {
   //根据Node属性生成XML文本
   string rssText = "<outline type=\"rss\" text=\"" + node.Text + "\" xmlUrl=\"URL\"/>";

return rssText;
}

  //成生目录节点的XML文本行
  private string GetDirectoryText(TreeNode node)
  {
   //根据Node属性生成XML文本
   string directoryText = "<outline text=\"" + node.Text + "\">";

return directoryText;
}
}
}