已知有一個XML文件（bookstore.xml）如下：
<?xml version="1.0" encoding="gb2312"?>
<bookstore>
<book genre="fantasy" ISBN="2-3631-4">
<title>Oberon's Legacy</title>
<author>Corets, Eva</author>
<price>5.95</price>
</book>
</bookstore>
1、往<bookstore>節點中插入一個<book>節點：
XmlDocument xmlDoc=new XmlDocument();
xmlDoc.Load("bookstore.xml");
XmlNode root=xmlDoc.SelectSingleNode("bookstore");//查找<bookstore>
XmlElement xe1=xmlDoc.CreateElement("book");//創建一個<book>節點
xe1.SetAttribute("genre","李贊紅");//設置該節點genre屬性
xe1.SetAttribute("ISBN","2-3631-4");//設置該節點ISBN屬性
XmlElement xesub1=xmlDoc.CreateElement("title");
xesub1.InnerText="CS從入門到精通";//設置文本節點
xe1.AppendChild(xesub1);//添加到<book>節點中
XmlElement xesub2=xmlDoc.CreateElement("author");
xesub2.InnerText="候捷";
xe1.AppendChild(xesub2);
XmlElement xesub3=xmlDoc.CreateElement("price");
xesub3.InnerText="58.3";
xe1.AppendChild(xesub3);
root.AppendChild(xe1);//添加到<bookstore>節點中
xmlDoc.Save("bookstore.xml");
//================
結果為：
<?xml version="1.0" encoding="gb2312"?>
<bookstore>
<book genre="fantasy" ISBN="2-3631-4">
<title>Oberon's Legacy</title>
<author>Corets, Eva</author>
<price>5.95</price>
</book>
<book genre="李贊紅" ISBN="2-3631-4">
<title>CS從入門到精通</title>
<author>候捷</author>
<price>58.3</price>
</book>
</bookstore>
?
2、修改節點：將genre屬性值為“李贊紅“的節點的genre值改為“update李贊紅”，將該節點的子節點<author>的文本修改為“亞勝”。
XmlNodeList nodeList=xmlDoc.SelectSingleNode("bookstore").ChildNodes;//獲取bookstore節點的所有子節點
foreach(XmlNode xn in nodeList)//遍歷所有子節點
{
XmlElement xe=(XmlElement)xn;//將子節點類型轉換為XmlElement類型
if(xe.GetAttribute("genre")=="李贊紅")//如果genre屬性值為“李贊紅”
{
xe.SetAttribute("genre","update李贊紅");//則修改該屬性為“update李贊紅”
XmlNodeList nls=xe.ChildNodes;//繼續獲取xe子節點的所有子節點??
foreach(XmlNode xn1 in nls)//遍歷
{
XmlElement xe2=(XmlElement)xn1;//轉換類型
if(xe2.Name=="author")//如果找到
{
xe2.InnerText="亞勝";//則修改
break;//找到退出來就可以了
}
}
break;
}
}
xmlDoc.Save("bookstore.xml");//保存。
?
//=================
最后結果為：
<?xml version="1.0" encoding="gb2312"?>
<bookstore>
<book genre="fantasy" ISBN="2-3631-4">
<title>Oberon's Legacy</title>
<author>Corets, Eva</author>
<price>5.95</price>
</book>
<book genre="update李贊紅" ISBN="2-3631-4">
<title>CS從入門到精通</title>
<author>亞勝</author>
<price>58.3</price>
</book>
</bookstore>
?
3、刪除 <book genre="fantasy" ISBN="2-3631-4">節點的genre屬性，刪除 <book genre="update李贊紅" ISBN="2-3631-4">節點。
XmlNodeList xnl=xmlDoc.SelectSingleNode("bookstore").ChildNodes;
foreach(XmlNode xn in xnl)
{
XmlElement xe=(XmlElement)xn;
if(xe.GetAttribute("genre")=="fantasy")
{
xe.RemoveAttribute("genre");//刪除genre屬性
}
else if(xe.GetAttribute("genre")=="update李贊紅")
{
xe.RemoveAll();//刪除該節點的全部內容
}
}
xmlDoc.Save("bookstore.xml");
?
//====================
最后結果為：
<?xml version="1.0" encoding="gb2312"?>
<bookstore>
<book ISBN="2-3631-4">
<title>Oberon's Legacy</title>
<author>Corets, Eva</author>
<price>5.95</price>
</book>
<book>
</book>
</bookstore>
4、顯示所有數據。
XmlNode xn=xmlDoc.SelectSingleNode("bookstore");
XmlNodeList xnl=xn.ChildNodes;
foreach(XmlNode xnf in xnl)
{
XmlElement xe=(XmlElement)xnf;
Console.WriteLine(xe.GetAttribute("genre"));//顯示屬性值
Console.WriteLine(xe.GetAttribute("ISBN"));
XmlNodeList xnf1=xe.ChildNodes;
foreach(XmlNode xn2 in xnf1)
{
Console.WriteLine(xn2.InnerText);//顯示子節點點文本
}
}
另有：
using System;
using System.IO;
using System.Web;
using System.Text;
using System.Xml;
using System.Collections;
namespace ShopWeb.Class
{
?/// <summary>
?/// Log 的摘要說明。
?/// </summary>
?public class Log
?{
??private XmlDocument xmlLog=new XmlDocument();
??private HttpContext context=HttpContext.Current;
??private string? xmlPath="";
??/// <summary>
??/// 構造函數
??/// </summary>
??/// <param name="XmlPath"></param>
??public Log(string XmlPath)
??{
???
???xmlPath=XmlPath;
???xmlLog.Load(context.Server.MapPath(XmlPath));
??}
??/// <summary>
??/// 增加一個節點，該節點由子節點構成
??/// </summary>
??/// <param name="HTChilds"></param>
??/// <param name="ParentName"></param>
??/// <returns></returns>
??public bool AddNodeByChild(Hashtable HTChilds ,string ParentName)
??{
???try
???{
????XmlNode Parent=xmlLog.CreateElement(ParentName);
??????????????? XmlNode Child;
????IDictionaryEnumerator myEnumerator=HTChilds.GetEnumerator();
???
????while(myEnumerator.MoveNext())
????{
?????Child=xmlLog.CreateElement(myEnumerator.Key.ToString());
?????Child.InnerText=myEnumerator.Value.ToString();
?????Parent.AppendChild(Child);
?????xmlLog.DocumentElement.AppendChild(Parent);
????}
????xmlLog.Save(context.Server.MapPath(xmlPath));
????return true;
???}
???catch
???{
????return false;
???}
???
??}
??/// <summary>
??///? 增加一個節點 該節點由屬性構成
??/// </summary>
??/// <param name="htAttributes"></param>
??/// <param name="NodeName"></param>
??/// <returns></returns>
??public bool AddNodeByAttribute(Hashtable htAttributes,string NodeName)
??{
??try
?? {
???XmlNode AddNode=xmlLog.CreateElement(NodeName);
???IDictionaryEnumerator myEnumerator=htAttributes.GetEnumerator();
???XmlAttribute atr;
???while(myEnumerator.MoveNext())
???{
????atr=xmlLog.CreateAttribute(myEnumerator.Key.ToString());
????atr.InnerText=myEnumerator.Value.ToString();
????AddNode.Attributes.Append(atr);
????xmlLog.DocumentElement.AppendChild(AddNode);
???}
???xmlLog.Save(context.Server.MapPath(xmlPath));
???return true;
??}
??catch
??{
???return false;
??}
??}
??/// <summary>
??/// 或得指定查詢節點得子節點數目
??/// </summary>
??/// <param name="QueryPath"></param>
??/// <returns></returns>
??public int ChildCount(string QueryPath)
??{
???try
???{
????XmlNode ResultNodes=xmlLog.SelectSingleNode(QueryPath);
????return ResultNodes.ChildNodes.Count;
???}
???catch
???{
????return -1;
???}
???
??}
???? /// <summary>
???? ///? 刪除指定路徑的節點
???? /// </summary>
???? /// <param name="QueryPath"></param>
???? /// <returns></returns>
??public bool DelelteNode(string QueryPath)
??{
???try
???{
????XmlNodeList ResultNodes=xmlLog.SelectNodes(QueryPath);
????for(int i=0;i<ResultNodes.Count;i++)
????{
?????XmlNode ParentNode=ResultNodes[i].ParentNode;
?????ParentNode.RemoveChild(ResultNodes[i]);
????}
????xmlLog.Save(context.Server.MapPath(xmlPath));
????return true;
???}
???catch
???{
????return false;
???}
???
??}
???? /// <summary>
???? /// 查詢節點
???? /// </summary>
???? /// <param name="QueryPath"></param>
???? /// <returns></returns>
??public XmlNodeList QueryNode(string QueryPath)
??{
???try
???{
????XmlNodeList ResultNodes=xmlLog.SelectNodes(QueryPath);
????return ResultNodes;
???}
???catch
???{
????return null;
???}
???
??}
?}
}