xml节点 增删改

首先写个类：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Xml;

/// <summary>
///Class1 的摘要说明
/// </summary>
public class Class1
{
    private XmlDocument xmlDoc;
    private string author;
    private string publisher;
    private string date;
    private string name;
    private string isbn;
    private string price;
    public Class1(string au, string pu, string date, string na, string isbn, string price)
    {
        this.author = au;
        this.publisher = pu;
        this.date = date;
        this.name = na;
        this.isbn = isbn;
        this.price = price;
    }
    /// <summary>
    /// 加载XML文件的方法
    /// </summary>
    /// <param name="xmlfile">XML文件路径</param>
    private void LoadXml()
    {
        xmlDoc = new XmlDocument();
        xmlDoc.Load(System.Web.HttpContext.Current.Server.MapPath("books.xml"));
    }
    public void AddNode()
    {
        //加载文档
        LoadXml();
        //选择根节点
        XmlNode xmldocboot = xmlDoc.SelectSingleNode("books");
        //开始添加节点及节点的属性
        XmlElement ele = xmlDoc.CreateElement("book");
        XmlElement ele1 = xmlDoc.CreateElement("author");
        ele1.InnerText = author;
        XmlElement ele2 = xmlDoc.CreateElement("publisher");
        ele2.InnerText = publisher;
        XmlElement ele3 = xmlDoc.CreateElement("date");
        ele3.InnerText = date;
        XmlElement ele4 = xmlDoc.CreateElement("name");
        ele4.InnerText = name;
        XmlElement ele5 = xmlDoc.CreateElement("isbn");
        ele5.InnerText = isbn;
        XmlElement ele6 = xmlDoc.CreateElement("price");
        ele6.InnerText = price;
        ele.AppendChild(ele1);
        ele.AppendChild(ele2);
        ele.AppendChild(ele3);
        ele.AppendChild(ele4);
        ele.AppendChild(ele5);
        ele.AppendChild(ele6);
        //将节点保存到根节点下
        xmldocboot.AppendChild(ele);
        //保存XML文件的修改-此处要注意
        xmlDoc.Save(System.Web.HttpContext.Current.Server.MapPath("books.xml"));
    }
}

 

添加节点：

Class1 myxml = new Class1(this.TextBox1.Text, this.TextBox4.Text, this.TextBox5.Text, this.TextBox6.Text, this.TextBox2.Text, this.TextBox3.Text);
//执行添加命令
 myxml.AddNode();

更改节点：

XmlNode node = xdoc.DocumentElement.SelectSingleNode("book[name='" + this.DropDownList1.Text + "']");
        XmlElement elem = (XmlElement)node.SelectSingleNode("author");
        elem.InnerText = this.TextBox1.Text;
        elem = (XmlElement)node.SelectSingleNode("publisher");
        elem.InnerText = this.TextBox4.Text;
        elem = (XmlElement)node.SelectSingleNode("date");
        elem.InnerText = this.TextBox5.Text;
        elem = (XmlElement)node.SelectSingleNode("price");
        elem.InnerText = this.TextBox3.Text;
        elem = (XmlElement)node.SelectSingleNode("isbn");
        elem.InnerText = this.TextBox2.Text;
        xdoc.Save(Server.MapPath("books.xml"));
        this.Response.Write("修改成功!");

删除节点：

XmlNode node = xdoc.DocumentElement.SelectSingleNode("book[name='" + this.DropDownList1.Text + "']");
        if (node != null)
        {
            xdoc.DocumentElement.RemoveChild(node);
            this.DropDownList1.Items.RemoveAt(this.DropDownList1.SelectedIndex);
            xdoc.Save(Server.MapPath("books_new.xml"));
        }