操作XML

读XML文件
protected void Page_Load(object sender, EventArgs e)
    {
        XmlTextReader xmltextreader = new XmlTextReader(Server.MapPath("phonebook.xml"));
        string outMsg = "";
        string currentNodeName = "";
        int i = 1;

        //利用XmlTextReader 对象的Read()方法热循环读取也文件的节点
        while (xmltextreader.Read())
        {
            //当节点类型是元素的时候，记录该文件的节点
            if (xmltextreader.NodeType == System.Xml.XmlNodeType.Element)
                currentNodeName = xmltextreader.LocalName.ToString();
            if ((xmltextreader.NodeType == System.Xml.XmlNodeType.Text))
            {
                //把个人的属性组织成文本串，便于页面输出
                outMsg += "<tr bgcolor=#fff5b1><td>" + currentNodeName + "</td><td>" + xmltextreader.Value + "</td></tr>";
            }
            if (xmltextreader.NodeType == System.Xml.XmlNodeType.Element && xmltextreader.LocalName.Equals("member"))
            {
                outMsg += "<tr><td>联络人：</td><td><font color=red>(" + (i++) + ")</font></td></tr>";
            }           
        }
        outMsg = "<table>" + outMsg + "</table>";
        //关闭Xmltextreader
        xmltextreader.Close();
        //显示联系人的详细信息
        Response.Write(outMsg);
    }
写XML文件
private void SaveXMLData_nodemode()
    {
        try
        {
            //创建一个XmlDocument 对象，用于载入存储信息的XML文件
            XmlDocument xdoc = new XmlDocument();
            xdoc.Load(Server.MapPath("phonebook.xml"));
            //创建一个新的member节点并将它添加到根节点下
            XmlElement parentNode = xdoc.CreateElement("member");
            xdoc.DocumentElement.PrependChild(parentNode);
            //创建所有用于存储信息的节点
            XmlElement nameNode = xdoc.CreateElement("name");
            XmlElement telphoneNode = xdoc.CreateElement("telphone");
            XmlElement qqNode = xdoc.CreateElement("qq");
            XmlElement msnNode = xdoc.CreateElement("msn");
            XmlElement cellphoneNode = xdoc.CreateElement("cellphone");
            XmlElement workNode = xdoc.CreateElement("work");
            XmlElement addressNode = xdoc.CreateElement("address");
            XmlElement emailNode = xdoc.CreateElement("email");

            //获取文本信息
            XmlText nameText = xdoc.CreateTextNode(Request.Form.Get("name"));
            XmlText telphoneText = xdoc.CreateTextNode(Request.Form.Get("telphone"));
            XmlText qqText = xdoc.CreateTextNode(Request.Form.Get("qq"));
            XmlText msnText = xdoc.CreateTextNode(Request.Form.Get("msn"));
            XmlText cellphoneText = xdoc.CreateTextNode(Request.Form.Get("cellphone"));
            XmlText workText = xdoc.CreateTextNode(Request.Form.Get("work"));
            XmlText addressText = xdoc.CreateTextNode(Request.Form.Get("address"));
            XmlText emailText = xdoc.CreateTextNode(Request.Form.Get("email"));

            //将上面创建的各个存储信息的节点添加到member节点下，但并不包含最终值?
            parentNode.AppendChild(nameNode);
            parentNode.AppendChild(telphoneNode);
            parentNode.AppendChild(qqNode);
            parentNode.AppendChild(msnNode);
            parentNode.AppendChild(cellphoneNode);
            parentNode.AppendChild(workNode);
            parentNode.AppendChild(addressNode);
            parentNode.AppendChild(emailNode);

            //将上面猎取的文本信息添加到与之相对应的节点中
            nameNode.AppendChild(nameText);
            telphoneNode.AppendChild(telphoneText);
            msnNode.AppendChild(msnText);
            qqNode.AppendChild(qqText);
            cellphoneNode.AppendChild(cellphoneText);
            workNode.AppendChild(workText);
            emailNode.AppendChild(emailText);

            //保存存储信息的XML文件
            xdoc.Save(Server.MapPath("phonebook.xml");
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message);
        }
    }
利用XmlTextWriter写文件
    private void SaveXMLData_XmlTextWriteMode()
    {
        try
        {
            FileInfo file = new FileInfo(Server.MapPath("phonebook.xml"));
            if (!file.Exists)
            {
                XmlTextWriter textWriter = new XmlTextWriter(Server.MapPath("phonebook.xml"), System.Text.Encoding.UTF8);
                textWriter.WriteStartDocument();

                textWriter.WriteStartElement("phonebook");
                textWriter.WriteStartElement("member");

                textWriter.WriteStartElement("name", "");
                textWriter.WriteString(Request.Form.Get("name"));
                textWriter.WriteEndElement();

                textWriter.WriteStartElement("telphone", "");
                textWriter.WriteString(Request.Form.Get("telphone"));
                textWriter.WriteEndElement();

                textWriter.WriteStartElement("qq", "");
                textWriter.WriteString(Request.Form.Get("qq"));
                textWriter.WriteEndElement();

                textWriter.WriteStartElement("msn", "");
                textWriter.WriteString(Request.Form.Get("msn"));
                textWriter.WriteEndElement();

                textWriter.WriteStartElement("cellphone", "");
                textWriter.WriteString(Request.Form.Get("cellphone"));
                textWriter.WriteEndElement();

                textWriter.WriteStartElement("work", "");
                textWriter.WriteString(Request.Form.Get("work"));
                textWriter.WriteEndElement();

                textWriter.WriteStartElement("address", "");
                textWriter.WriteString(Request.Form.Get("address"));
                textWriter.WriteEndElement();

                textWriter.WriteStartElement("email", "");
                textWriter.WriteString(Request.Form.Get("email"));
                textWriter.WriteEndElement();

                textWriter.WriteEndDocument();

                textWriter.Close();
            }
            else
            {
                SaveXMLData_nodemode();
            }
            Response.Redirect("viewphonebook_reader.aspx");
        }
        catch(Exception ex)
        {
            Console.WriteLine(ex.Message);
        }
    }
查找XML文件
private void findname(string name);
{
   XmlDocument xml = new XmlDocument();
   bool findnode = false;

   try
   {
      xml.Load(Server.MapPath("phonebook.xml"));
   }
   catch
   { }
  
   XmlNodeReader read = new XmlNodeReader(xml);
   while (read.Read())
   {
      if ((read.NodeType == System.Xml.XmlNodeType.Element) &&
           read.LocalNmae.ToString().Equals(name))
      {
          read.Read();
          if (read.NodeType == System.Xml.XmlNodeType.Text)
          {
              Response.Write(read.Value);
              break;
          }
      }
   }
}
附：pnohebook.xml
<?xml version="1.0" encoding="utf-8"?>
<phonebook>
  <member>
    <name>2</name>
    <telphone>2121</telphone>
    <qq>12</qq>
    <msn>1212</msn>
    <cellphone>12</cellphone>
    <work>121</work>
    <address />
    <email>12121</email>
  </member>
  <member>
    <name>wxy</name>
    <telphone>312222</telphone>
    <qq>0000</qq>
    <msn>000@xxx.xxxx</msn>
    <cellphone>1111111</cellphone>
    <work>xxxxxxx</work>
    <address>xxxxxxxxx</address>
    <email>xxxx@xxx.xxx</email>
  </member>
  <member>
    <name>sd/name>
    <telphone>312222</telphone>
    <qq>11286759</qq>
    <msn>yishaogang@htomail.com</msn>
    <cellphone>3571751</cellphone>
    <work>sd/work>
    <address>sdsd</address>
    <email>yishaogang@yahoo.com.cn</email>
  </member>
</phonebook>

利用DataSet读取/写入XML

protected void Page_Load(object sender,EventArgs e)
{
   System.Data.DataSet ds = new DataSet();
   ds.ReadXml(Server.MapPath("phonebook.xml"));
   GridView1.DataSource = ds;
   GridView1.DataBind();
}

private void writeToXml()
{
   DataTable dt = new DataTable();
   dt.Columns.Add("name",Type.GetType("System.String"));
   dt.Columns.Add("telphone",Type.GetType("System.String"));
   dt.Columns.Add("qq",Type.GetType("System.String"));
   dt.Columns.Add("msn",Type.GetType("System.String"));
   dt.Columns.Add("cellphone",Type.GetType("System.String"));
   dt.Columns.Add("work",Type.GetType("System.String"));
   dt.Columns.Add("address",Type.GetType("System.String"));
   dt.Columns.Add("email",Type.GetType("System.String"));

   DataRow dr = dt.NewRow();
   dr[0] = "wxy";
   dr[1] = "1";
   dr[2] = "1";
   dr[3] = "1";
   dr[4] = "1";
   dr[5] = "1";
   dr[6] = "1";
   dr[7] = "1";
 
   dt.Rows.Add(dr);
   System.Data.DataSet ds = new DataSet();
   ds.Tables.Add(dt);
   ds.WriteXml(Server.MapPath("phonebook.xml"));
   GridView1.DataSource = ds;
   GridView1.DataBind();

}