C# 操作XML

－、XMLTextWriter用法

 

代码

   
     

    
      
    
      using
    
       (System.IO.MemoryStream stream 
    
      =
    
       
    
      new
    
       System.IO.MemoryStream())
 {
 
    
      //
    
      System.Xml.XmlTextWriter writer = new System.Xml.XmlTextWriter(stream, null);
    
      

    
       System.Xml.XmlTextWriter writer 
    
      =
    
       
    
      new
    
       System.Xml.XmlTextWriter(Server.MapPath(
    
      "
    
      userInfo.xml
    
      "
    
      ), System.Text.Encoding.UTF8);

 writer.Formatting 
    
      =
    
       System.Xml.Formatting.Indented;
 writer.WriteStartDocument(
    
      true
    
      );

 writer.WriteStartElement(
    
      "
    
      PP
    
      "
    
      );
 writer.WriteStartElement(
    
      "
    
      X
    
      "
    
      );
 writer.WriteString(
    
      "
    
      1
    
      "
    
      );
 writer.WriteEndElement();
 writer.WriteStartElement(
    
      "
    
      Y
    
      "
    
      );
 writer.WriteString(
    
      "
    
      1
    
      "
    
      );
 writer.WriteEndElement();
 writer.WriteStartElement(
    
      "
    
      Name
    
      "
    
      );
 writer.WriteString(
    
      "
    
      fan
    
      "
    
      );
 writer.WriteEndElement();
 writer.WriteEndElement();
 writer.Flush();
 writer.Close();
 }
   
     

二、XMLDocument用法

 

代码

   
     

    
      
    
       XmlDocument xmldoc;
 XmlNode xmlnode;
 xmldoc 
    
      =
    
       
    
      new
    
       XmlDocument();

 xmlnode 
    
      =
    
       xmldoc.CreateNode(XmlNodeType.XmlDeclaration, 
    
      ""
    
      , 
    
      ""
    
      );
 xmldoc.AppendChild(xmlnode); 
 
    
      //
    
      加入XML的声明段落,<?xml version="1.0" encoding="utf-8"?>
 
    
      //
    
      xmlnode = xmldoc.CreateXmlDeclaration("1.0", "utf-8", null);
 
    
      //
    
      xmldoc.AppendChild(xmlnode);
 
    
      //
    
      加入一个根元素
    
      

    
       xmldoc.AppendChild(xmldoc.CreateElement(
    
      ""
    
      , 
    
      "
    
      Menu
    
      "
    
      , 
    
      ""
    
      ));

 
    
      foreach
    
       (ComponentArt.Web.UI.MenuItem mi 
    
      in
    
       Menu2.Items)
 {
 
    
      if
    
       (mi.Enabled 
    
      &&
    
       mi.Visible)
 {
 XmlElement xmlelem;
 xmlelem 
    
      =
    
       xmldoc.CreateElement(
    
      "
    
      Item
    
      "
    
      );
 xmlelem.SetAttribute(
    
      "
    
      title
    
      "
    
      , 
    
      string
    
      .Format(
    
      "
    
      {0}
    
      "
    
      , mi.Text));

 
    
      if
    
       (
    
      string
    
      .IsNullOrEmpty(mi.NavigateUrl))
 xmlelem.SetAttribute(
    
      "
    
      url
    
      "
    
      , 
    
      string
    
      .Format(
    
      "
    
      {0}
    
      "
    
      , mi.Items[
    
      0
    
      ].NavigateUrl));
 
    
      else
    
      
 xmlelem.SetAttribute(
    
      "
    
      url
    
      "
    
      , 
    
      string
    
      .Format(
    
      "
    
      {0}
    
      "
    
      , mi.NavigateUrl));

 xmldoc.ChildNodes.Item(
    
      1
    
      ).AppendChild(xmlelem);
 }
 }

 xmldoc.Save(Request.PhysicalApplicationPath 
    
      +
    
       
    
      @"
    
      data.xml
    
      "
    
      );
 
    
      string
    
       xmlContent
    
      =
    
       xmldoc.OuterXml;
   
     

 

 

另外读取的话，用XMLTextReader很方式，也是只进读取，性能据说比较ＯＫ!
    三、XMLTextReader用法

 

代码

   
     

    
      
    
       
    
      string
    
       targer;
 XmlDocument xmldoc 
    
      =
    
       
    
      new
    
       XmlDocument();
 xmldoc.Load(
    
      "
    
      userInfo.xml
    
      "
    
      );
 
    
      byte
    
      [] bytes 
    
      =
    
       System.Text.UTF8Encoding.UTF8.GetBytes(xmldoc.OuterXml);
 
    
      using
    
       (System.IO.MemoryStream stream 
    
      =
    
       
    
      new
    
       System.IO.MemoryStream(bytes))
 {
 
    
      using
    
       (XmlTextReader reader 
    
      =
    
       
    
      new
    
       XmlTextReader(stream))
 {
 
    
      while
    
       (reader.Read())
 {
 
    
      if
    
       (
    
      !
    
      reader.IsEmptyElement 
    
      &&
    
       reader.NodeType 
    
      ==
    
       XmlNodeType.Element)
 {
 
    
      switch
    
       (reader.LocalName)
 {
 
    
      case
    
       
    
      "
    
      X
    
      "
    
      :
 targer 
    
      =
    
       reader.ReadString();
 
    
      break
    
      ;
 }
 }
 }
 }
 }
   
     

 

另外，XML的一个应用是序列化，要用到把字符串转化成byte数组，方法：
   byte[] bytes = System.Text.UTF8Encoding.UTF8.GetBytes(XmlContent); 
相对的，把byte数组转化为字符串的方法则为：
　string XmlContent = System.Text.UTFEncoding.UTF8.GetString(bytes);
这样方便了吧，把想存的东东转化为byte数组，然后压缩一下，网络传输的话也应该很ＯＫ了吧