XML操作之二

本文介绍了一个使用ASP.NET进行XML文件读写操作的具体实例,包括读取XML中已知和未知属性、向XML文件中添加新的元素及修改和删除元素的过程。

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using System;
using System.Data;
using System.Configuration;
using System.Collections;
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;
public partial class Default2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        //读取XML
        //已知属性名
        //XmlDocument xmlDoc = new XmlDocument();
        //xmlDoc.Load(Server.MapPath("test.xml"));
        //XmlNode xn = xmlDoc.SelectSingleNode("bookstore");
        //XmlNodeList xnl = xn.ChildNodes;
        //foreach (XmlNode xn1 in xnl)
        //{
        //    XmlElement xe = (XmlElement)xn1;
        //    Response.Write(xe.GetAttribute("genre")+"<BR>");
        //    Response.Write(xe.GetAttribute("ISBN") + "<BR>");
        //    XmlNodeList subxn = xe.ChildNodes;
        //    foreach (XmlNode xn2 in subxn)
        //    {
        //        Response.Write(xn2.InnerText+"<BR>");
        //    }
        //    Response.Write("<BR>");
        //}
        //未知属性名
        XmlDocument XmlDoc = new XmlDocument();
        XmlDoc.Load(Server.MapPath("test.xml"));
        XmlNode xn = XmlDoc.SelectSingleNode("bookstore");
        XmlNodeList xnl = xn.ChildNodes;
        foreach (XmlNode xn1 in xnl)
        {
            XmlElement xe = (XmlElement)xn1;
            XmlAttributeCollection xc = xe.Attributes;
            for (int i = 0; i < xe.Attributes.Count; i++)
            {
                Response.Write(xc.Item(i).Name + ":&nbsp");
                Response.Write(xc.Item(i).Value + "<BR>");
            }
            XmlNodeList xnl2 = xe.ChildNodes;
            foreach (XmlNode xn2 in xnl2)
            {
                Response.Write(xn2.InnerText);
                Response.Write("<BR>");
            }
            Response.Write("<BR>");
        }
    }
    protected void Button2_Click(object sender, EventArgs e)
    {
        //写入XML
        XmlDocument XmlDoc = new XmlDocument();
        XmlDoc.Load(Server.MapPath("test.xml"));
        XmlNode xn = XmlDoc.SelectSingleNode("bookstore");
        XmlElement subxml1 = XmlDoc.CreateElement("book");
        subxml1.SetAttribute("genre", "leo");
        subxml1.SetAttribute("ISBN", "123-456-789");
        XmlElement subXmlxe1 = XmlDoc.CreateElement("title");
        subXmlxe1.InnerText = "饮食学";
        subxml1.AppendChild(subXmlxe1);
        XmlElement subXmlxe2 = XmlDoc.CreateElement("author");
        subXmlxe2.InnerText = "秦浩";
        subxml1.AppendChild(subXmlxe2);
        XmlElement subXmlxe3 = XmlDoc.CreateElement("price");
        subXmlxe3.InnerText = "888888";
        subxml1.AppendChild(subXmlxe3);
        xn.AppendChild(subxml1);
        XmlDoc.Save(Server.MapPath("test.xml"));
    }
    protected void Button3_Click(object sender, EventArgs e)
    {
        XmlDocument XmlDoc = new XmlDocument();
        XmlDoc.Load(Server.MapPath("test.xml"));
        XmlNodeList xnl = XmlDoc.SelectSingleNode("bookstore").ChildNodes;//获取bookstore节点的所有子节点
        foreach(XmlNode xn in xnl)
        {
            XmlElement xe = (XmlElement)xn;
            if(xe.GetAttribute("genre")=="leo")
            {
                xe.SetAttribute("genre","qinhao");
                XmlNodeList xel = xe.ChildNodes;
                foreach(XmlNode xn1 in xel)
                {
                    XmlElement xe1=(XmlElement)xn1;
                    if(xe1.Name=="title")
                    {
                        xe1.InnerText = "C#";
                    }
                }
            }
        }
        XmlDoc.Save(Server.MapPath("test.xml"));
    }
    protected void Button4_Click(object sender, EventArgs e)
    {
        XmlDocument XmlDoc = new XmlDocument();
        XmlDoc.Load(Server.MapPath("test.xml"));
        XmlNodeList xnl1 = XmlDoc.SelectSingleNode("bookstore").ChildNodes;
        foreach(XmlNode xn1 in xnl1 )
        {
            XmlElement xe = (XmlElement)xn1;
            if (xe.GetAttribute("genre") == "qinhao")
            {
                //xe.RemoveAttribute("genre");
                xe.RemoveAll();
            }
        }
        XmlDoc.Save(Server.MapPath("test.xml"));
    }
}
 
 
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