c#操作XML

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01.using System;
02.using System.Data;
03.using System.Configuration;
04.using System.Collections;
05.using System.Web;
06.using System.Web.Security;
07.using System.Web.UI;
08.using System.Web.UI.WebControls;
09.using System.Web.UI.WebControls.WebParts;
10.using System.Web.UI.HtmlControls;
11.
12.using System.Xml;
13.
14.public partial class test_Default : System.Web.UI.Page
15.{
16.    string xmlFile = System.Configuration.ConfigurationManager.AppSettings["xmlFile"];
17.    XmlDocument XmlDoc = new XmlDocument();
18.    protected void Page_Load(object sender, EventArgs e)
19.    {
20.        Bind();
21.    }
22.    private void Bind()
23.    {
24.        XmlDoc.Load(Server.MapPath("../" + xmlFile));//向上一级
25.        this.showXml.InnerHtml = System.Web.HttpUtility.HtmlEncode(XmlDoc.InnerXml);
26.    }
27.    protected void XmlAdd(object sender, EventArgs e)
28.    {
29.        XmlNode objRootNode = XmlDoc.SelectSingleNode("//Root");    //声明XmlNode对象
30.        XmlElement objChildNode = XmlDoc.CreateElement("Student"); //创建XmlElement对象
31.        objChildNode.SetAttribute("id", "1");
32.        objRootNode.AppendChild(objChildNode);
33.        //
34.        XmlElement objElement = XmlDoc.CreateElement("Name");//???结点和元素的区别?方法都一样.
35.        objElement.InnerText = "tree1";
36.        objChildNode.AppendChild(objElement);
37.        //保存
38.        XmlDoc.Save(Server.MapPath("../" + xmlFile));
39.    }
40.    protected void XmlDelete(object sender, EventArgs e)
41.    {
42.        string Node = "//Root/Student[Name='tree1']";//Xml是严格区分大小写的.
43.        XmlDoc.SelectSingleNode(Node).ParentNode.RemoveChild(XmlDoc.SelectSingleNode(Node));
44.        //保存
45.        XmlDoc.Save(Server.MapPath("../" + xmlFile));
46.    }
47.    protected void XmlUpdate(object sender, EventArgs e)
48.    {
49.        //XmlDoc.SelectSingleNode("//Root/Student[Name='tree1']/Name").InnerText = "tree2";
50.        XmlDoc.SelectSingleNode("//Root/Student[Name='tree1']").Attributes["id"].Value = "001";
51.        //保存
52.        XmlDoc.Save(Server.MapPath("../" + xmlFile));
53.    }
54.    protected void XmlQuery(object sender, EventArgs e)
55.    {
56.        XmlNodeList NodeList = XmlDoc.SelectNodes("//Root/Student");//查询全部的student节点
57.        //循环遍历节点，查询是否存在该节点
58.        for (int i = 0; i < NodeList.Count; i++)
59.        {
60.            Response.Write(NodeList[i].ChildNodes[0].InnerText);
61.        }
62.
63.        //查询单个节点,//表示全部匹配的元素./表示以此为根的子元素.javascript下的查询也是一样.
64.        string XmlPathNode = "//Root/Student[Name='rock']/Photo";
65.        Response.Write(XmlDoc.SelectSingleNode(XmlPathNode).InnerText);
66.    }
67.}