回忆一个C#对XML的增删改查操作

好久不用XML了。最近做Silverlight项目，需要通过Web Service访问一些C++的Dll.
使用XML传递数据。正好复习一下XML操作。

大气象

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

using System.Xml;
using System.IO;

namespace HCLoad.Web
{
public partial class TestXml : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
LoadXml();
}
private void LoadXml()
{
XmlDocument xmlDoc = new XmlDocument();
string strXml =
@"<?xml version=""1.0"" encoding=""utf-16"" ?>
<projects>
<project id=""1"">p1</project>
<project id=""2"">
<name>p2</name>
</project>
</projects>";
xmlDoc.LoadXml(strXml);

//Response.Write("<script>alert('" + xmlDoc.OuterXml + "');</script>");//OuterXml是该结点包含的全部内容
//Response.Write(xmlDoc.OuterXml);//直接在浏览器中输出xml文档是空白，因为浏览器无法解析这些标签。

//根据属性值查询
XmlElement theProject = (XmlElement)xmlDoc.DocumentElement.SelectSingleNode("/projects/project[@id='1']");
Response.Write(theProject.InnerText);

//根据子节点值查询
XmlElement theProject2 = (XmlElement)xmlDoc.DocumentElement.SelectSingleNode("/projects/project[name='p2']");
Response.Write(theProject2.InnerText);//注意是查询到name那一层了。

//通过标签名查询，并修改
xmlDoc.GetElementsByTagName("project").Item(0).InnerText = "p11";
//Response.Write("<script>alert('" + xmlDoc.OuterXml + "');</script>");

//增加属性
XmlElement theElement = xmlDoc.DocumentElement.FirstChild as XmlElement;
theElement.SetAttribute("no", "001");
//Response.Write("<script>alert('" + xmlDoc.OuterXml + "');</script>");

//删除结点
//theElement.ParentNode.RemoveChild(theProject);

//删除结点集
XmlNodeList nodeList = xmlDoc.DocumentElement.SelectNodes("/projects/project[@id<3]");
for (int i = 0; i < nodeList.Count; i++)
{
nodeList.Item(i).ParentNode.RemoveChild(nodeList.Item(i));
}
Response.Write("<script>alert('" + xmlDoc.OuterXml + "');</script>");
}
}
}

看到一位新手的笔记：

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