C# 操作XML

XML存储数据的一种文本格式，以节点的方式存储，类似html,只是节点名称可以自己定义。

1.创建XML

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public void fun_createXML() {             XmlNode xmlnode;             XmlElement xmlelem;             XmlDocument xmldoc = new XmlDocument();             //创建根节点             XmlDeclaration xmldecl = xmldoc.CreateXmlDeclaration("1.0", "gb2312", null);             xmldoc.AppendChild(xmldecl);             //创建员工节点容器             xmlelem = xmldoc.CreateElement("", "Employees", "");             xmldoc.AppendChild(xmlelem);             //放三个员工到容器里面             for (int i = 0; i < 3; i++)             {                 //xmldoc.SelectSingleNode()查找某个节点                 xmlnode = xmldoc.SelectSingleNode("Employees");                 //创建节点                 XmlElement xe = xmldoc.CreateElement("node");                 xe.SetAttribute("name", "evan");//设置属性                 xe.SetAttribute("age", "27");                 //创建节点                 XmlElement kemu1 = xmldoc.CreateElement("title");                 kemu1.SetAttribute("id", "title");//设置属性                 kemu1.InnerText = "javascript";//设置文本                 xe.AppendChild(kemu1);//填充到xe节点中                   XmlElement score = xmldoc.CreateElement("score");                 score.InnerText = "86.5";                 xe.AppendChild(score);                   xmlnode.AppendChild(xe);             }             //在项目根目录创建XML文件             xmldoc.Save(Server.MapPath("data3.xml"));         }

2.读取XML

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public void fun_GetXML() {            //System.IO.StreamReader myfile =            //    new System.IO.StreamReader(Server.MapPath("data3.xml"),System.Text.Encoding.Default);            //string mystring = myfile.ReadToEnd();//以文本的方式获取全部文本            //myfile.Close();            XmlDocument xd = new XmlDocument();            xd.Load(Server.MapPath("data3.xml"));            //获取所有子节点            XmlNodeList xnlist = xd.SelectSingleNode("Employees").ChildNodes;            for (int i = 0; i < xnlist.Count; i++) {                XmlElement xe = (XmlElement)xnlist[i];                Response.Write("名字是："+xe.GetAttribute("name")+"</br>");//获取属性名称                //获取子节点                XmlNodeList xn2=xe.ChildNodes;                for (int y = 0; y < xn2.Count; y++)                {                    XmlElement xe2 = (XmlElement)xn2[y];                    if (xe2.Name == "title")//节点名称                    {                        Response.Write("科目是：" + xe2.InnerText + "</br>");                    }                    else {                        Response.Write("分数数：" + xe2.InnerText + "</br>");                    }                }            }        }

3.修改XML

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public void fun_updateXMLText()         {             XmlDocument xd = new XmlDocument();             xd.Load(Server.MapPath("data3.xml"));             //获取所有子节点             XmlNodeList nodelist = xd.SelectSingleNode("Employees").ChildNodes;             //循环子节点             foreach (XmlNode x in nodelist)             {                 //转换                 XmlElement xe = (XmlElement)x;                 if (xe.Name == "NEWnode")                 {//判断节点名称                     xe.InnerText = "bbbbbbbbbb";//修改里面的文本                 }             }             xd.Save(Server.MapPath("data3.xml"));//重新保存           }

4.添加XML

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public void fun_addNodeXML() {             XmlDocument xd = new XmlDocument();             xd.Load(Server.MapPath("data3.xml"));             XmlNode xn = xd.SelectSingleNode("Employees");               XmlElement xe = xd.CreateElement("NEWnode");             xe.InnerText = "NEWnodeTEXT";             xn.AppendChild(xe);               xd.Save(Server.MapPath("data3.xml"));           }

　5.删除XML节点

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XmlDocument xmlDoc=new XmlDocument(); xmlDoc.Load( Server.MapPath("data.xml") ); XmlNodeList xnl=xmlDoc.SelectSingleNode("Employees").ChildNodes; foreach(XmlNode xn in xnl) {     XmlElement xe=(XmlElement)xn;     xe.RemoveAttribute("genre");//删除genre属性       XmlNodeList nls=xe.ChildNodes;//继续获取xe子节点的所有子节点     foreach(XmlNode xn1 in nls)//遍历     {         XmlElement xe2=(XmlElement)xn1;//转换类型         if(xe2.Name=="flag")//如果找到         {             xe.RemoveChild(xe2);//则删除         }     } } xmlDoc.Save( Server.MapPath("data.xml") );