xml read -write -update -remove

<?xml version="1.0"?>
<UserLogin>
  <User>
    <UserCode>001</UserCode>
    <UserName>操作员1</UserName>
    <UserPwd>111</UserPwd>
  </User>
  <User>
    <UserCode>002</UserCode>
    <UserName>操作员2</UserName>
    <UserPwd>222</UserPwd>
  </User>
</UserLogin>
 

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Xml;

/**//// <summary>
/// Xml文件的读写类
/// </summary>
/// 
public class XmlRW
...{
    public XmlRW()
    ...{
        //
        // TODO: 在此处添加构造函数逻辑
        //
    }
    
    //WriteXml 完成对User的添加操作 
    //FileName 当前xml文件的存放位置
    //UserCode 欲添加用户的编码
    //UserName 欲添加用户的姓名
    //UserPassword 欲添加用户的密码

    public void WriteXML(string FileName,string UserCode,string UserName,string UserPassword)
    ...{
    
        //初始化XML文档操作类
        XmlDocument myDoc = new XmlDocument();
        //加载XML文件
        myDoc.Load(FileName);

        //添加元素--UserCode
        XmlElement ele = myDoc.CreateElement("UserCode");
        XmlText text = myDoc.CreateTextNode(UserCode);

        //添加元素--UserName
        XmlElement ele1 = myDoc.CreateElement("UserName");
        XmlText text1 = myDoc.CreateTextNode(UserName);

        //添加元素--UserPwd
        XmlElement ele2 = myDoc.CreateElement("UserPwd");
        XmlText text2 = myDoc.CreateTextNode(UserPassword);

        //添加节点 User要对应我们xml文件中的节点名字
        XmlNode newElem = myDoc.CreateNode("element", "User", "");

        //在节点中添加元素
        newElem.AppendChild(ele);
        newElem.LastChild.AppendChild(text);
        newElem.AppendChild(ele1);
        newElem.LastChild.AppendChild(text1);
        newElem.AppendChild(ele2);
        newElem.LastChild.AppendChild(text2);

        //将节点添加到文档中
        XmlElement root = myDoc.DocumentElement;
        root.AppendChild(newElem);

        //保存
        myDoc.Save(FileName);
        
    }

    //DeleteNode 完成对User的添加操作 
    //FileName 当前xml文件的存放位置
    //UserCode 欲添加用户的编码

    public void DeleteNode(string FileName, string UserCode)
    ...{
        //初始化XML文档操作类
        XmlDocument myDoc = new XmlDocument();
        //加载XML文件
        myDoc.Load(FileName);

        //搜索指定某列，一般是主键列
        XmlNodeList myNode = myDoc.SelectNodes("//UserCode");

        //判断是否有这个节点

        if (!(myNode == null))
        ...{ 
            //遍历节点，找到符合条件的元素

            foreach (XmlNode  xn in myNode)
            ...{
                if (xn.InnerXml  == UserCode)
                    //删除元素的父节点
                    xn.ParentNode.ParentNode.RemoveChild(xn.ParentNode);
            }
        }

        //保存
        myDoc.Save(FileName);

    }

    //WriteXml 完成对User的修改密码操作
    //FileName 当前xml文件的存放位置
    //UserCode 欲操作用户的编码
    //UserPassword 欲修改用户的密码

    public void UpdateXML(string FileName, string UserCode, string UserPassword)
    ...{

        //初始化XML文档操作类
        XmlDocument myDoc = new XmlDocument();
        //加载XML文件
        myDoc.Load(FileName);

        //搜索指定的节点
        System.Xml.XmlNodeList nodes = myDoc.SelectNodes("//User");

        if (nodes != null)
        ...{
            foreach (System.Xml.XmlNode xn in nodes)
            ...{
                if (xn.SelectSingleNode("UserCode").InnerText == UserCode)
                ...{
                    xn.SelectSingleNode("UserPwd").InnerText = UserPassword;
                }

            }
        }

        myDoc.Save(FileName);

    }

}

 

·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";
  }