C#读写XML文件

**************************** phone.xml ****************************
<?xml version="1.0" encoding="utf-8" ?>
<PhoneBook>
<phone id="001">
  <Name>加菲尔德</Name>
  <Number>5555555</Number>
  <City>纽约</City>
  <DateOfBirth>26/10/1978</DateOfBirth>
</phone>
<phone id="002">
  <Name>迈克</Name>
  <Number>6666666</Number>
  <City>纽约</City>
  <DateOfBirth>12/02/1978</DateOfBirth>
</phone>
</PhoneBook>
*******************************************************
·使用Document读取及写入XML方法
  private void xmlfun()
  {
   XmlDocument doc = new XmlDocument();
   doc.Load(Server.MapPath("phone.xml"));
   XmlElement node = doc.CreateElement("phone");
   XmlAttribute atr = doc.CreateAttribute("id");
   atr.InnerText = "003";
   node.Attributes.Append(atr);
   XmlNode xnode = (XmlNode)doc.CreateElement("Name");
   xnode.InnerText="testName";
   node.AppendChild(xnode);
   xnode = (XmlNode)doc.CreateElement("Number");
   xnode.InnerText="119";
   node.AppendChild(xnode);
   xnode = (XmlNode)doc.CreateElement("City");
   xnode.InnerText="cs";
   node.AppendChild(xnode);
   xnode = (XmlNode)doc.CreateElement("DateOfBirth");
   xnode.InnerText="12/02/1978";
   node.AppendChild(xnode);
   doc.DocumentElement.InsertAfter(node,doc.DocumentElement.LastChild);
   doc.Save(Server.MapPath("phone1.xml"));   //必须要存为不同的文件
  }

·使用XmlTextWriter写入XML方法
private void xmlwriter()
  {
   XmlTextWriter writer= new XmlTextWriter(Server.MapPath("phone4.xml"),null);
   writer.Formatting = Formatting.Indented;  //缩进格式
   writer.Indentation =4;
   writer.WriteStartDocument();
   writer.WriteStartElement("Person");
   writer.WriteStartAttribute("ID",null);
   writer.WriteString("004");
   writer.WriteEndAttribute();
   writer.WriteStartElement("Name");
   writer.WriteString("testWriterName");
   writer.WriteEndElement();
   writer.WriteStartElement("Number");
   writer.WriteString("88888");
   writer.WriteEndElement();
   writer.WriteStartElement("City");
   writer.WriteString("testWriterCity");
   writer.WriteEndElement();
   writer.Flush();
   writer.Close();
  }

·使用XmlTextReader读取XML方法
  private void xmlread()
  {
      XmlTextReader reader = new XmlTextReader(Server.MapPath("phone.xml"));
      while(reader.Read())
      {
          if(reader.LocalName.Equals("Name") || reader.LocalName.Equals("Number"))
      {
      this.Label1.Text += reader.ReadString()+"\t";
  }


·作用SqlCommand.ExecuteXmlReader()取得XML
SqlConnecting conn = new SqlConnection(CONNSTR);
SqlCommand cmd = new SqlCommand("select fname from employee for xml auto",conn);
conn.open();
XmlReader reader = cmd.ExecuteXmlReader();
......
################ 所取xml数据格式 #################
<employee fname="aria"/>
<employee fname="carlors"/>......