XML读写操作

 

Code
//xml写入
public partial class XML应用_XML写入 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    protected void btnSubmit_Click(object sender, System.EventArgs e)
    {
        DataSet ds = new DataSet("myDs");
        //从XML中读取数据
        ds.ReadXml(Server.MapPath(@".\db\Guest.xml"));
        //以下为添加记录
        DataRow dr = ds.Tables[0].NewRow();
        dr["Name"] = tbName.Text.Trim();
        dr["City"] = tbCity.Text.Trim();
        dr["Email"] = tbEmail.Text.Trim();
        dr["Message"] = tbComments.Text.Trim();
        dr["STime"] = DateTime.Now.ToString();
        ds.Tables[0].Rows.Add(dr);
        //写回XML
        ds.WriteXml(Server.MapPath(".\\db\\Guest.xml"));
        Response.Redirect("view.aspx");

    }
}
//xml读取操
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml;
public partial class XML应用_XML读取 : System.Web.UI.Page
{
     protected void Page_Load(object sender, System.EventArgs e)
    {
        // 在此处放置用户代码以初始化页面
        if (!IsPostBack)
        {
            Bind();
        }

    }
    private void Bind()
    {
        //显示在datagird上
        DataSet ds = new DataSet();
        ds.ReadXml(Server.MapPath(".\\db\\dbGuest.xml"));//取当前路径下DB文件夹下的的dbGuest.xml文件
        //ds.ReadXml(Server.MapPath("db/XMLFile.xml"));//取当前路径下DB文件夹下的的XMLFile.xml文件           
        //ds.ReadXml(Server.MapPath("XMLFile.xml"));  //取当前路径（文件夹）下dbGuest.xml文件
        //ds.ReadXml(Server.MapPath("../OpXMLFile/XMLFile.xml"));//取当前路径（文件夹）外的dbGuest.xml文件
        //ds.ReadXml(Server.MapPath("../XMLBU/DB/XMLFile.xml"));//取不是当前路径下而是XMLBU/DB下的XMLFile.xml
        dgShow.DataSource = ds.Tables[0].DefaultView;
        dgShow.DataBind();//datagrid

        //把姓名绑定在dropdownlist
        XmlDocument doc = new XmlDocument();
        doc.Load(Server.MapPath(".\\db\\dbGuest.xml"));
        XmlNodeList elemList = doc.GetElementsByTagName("Name");
        ddlName.Items.Clear();
        for (int i = 0; i < elemList.Count; i++)
            ddlName.Items.Add(elemList[i].InnerXml);//获取或者设置代表该节点的字节点的标记

    }

   

    protected void btnQuery_Click(object sender, System.EventArgs e)
    {
        XmlDocument doc = new XmlDocument();
        doc.Load(Server.MapPath(".\\db\\dbGuest.xml"));
        lbEmail.Text = doc.SelectSingleNode("//User[Name='" + ddlName.SelectedItem.Text + "']").ChildNodes.Item(2).InnerText;

    }

    protected void btnChange_Click(object sender, System.EventArgs e)
    {
        XmlDocument xmlDoc = new XmlDocument();
        xmlDoc.Load(Server.MapPath(".\\db\\dbGuest.xml"));
        XmlNodeList nodeList = xmlDoc.SelectSingleNode("dbGuest").ChildNodes;//获取dbGuest节点的所有子节点
        foreach (XmlNode xn in nodeList)//遍历所有子节点
        {
            XmlElement xe = (XmlElement)xn;//将子节点类型转换为XmlElement类型

            XmlNodeList node = xe.GetElementsByTagName("Name");
            if (node.Count > 0)
            {

                if (node[0].InnerText == ddlName.SelectedItem.Text)
                {
                    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 == "Email")//如果找到
                        {
                            xe2.InnerText = tbNewMail.Text;//则修改
                            break;//找到退出来就可以了
                        }
                    }
                    break;
                }
            }

        }
        xmlDoc.Save(Server.MapPath(".\\db\\dbGuest.xml"));
        Bind();
    }

    protected void btnDelete_Click(object sender, System.EventArgs e)
    {
        XmlDocument xmlDoc = new XmlDocument();
        xmlDoc.Load(Server.MapPath(".\\db\\dbGuest.xml"));
        XmlNodeList xnl = xmlDoc.SelectSingleNode("dbGuest").ChildNodes;

        foreach (XmlNode xn in xnl)
        {
            XmlElement xe = (XmlElement)xn;
            XmlNodeList node = xe.GetElementsByTagName("Name");
            if (node.Count > 0)
            {

                if (node[0].InnerText == ddlName.SelectedItem.Text)
                    xe.RemoveAll();//删除该节点的全部内容
                break;
            }
        }

        xmlDoc.Save(Server.MapPath(".\\db\\dbGuest.xml"));
        Bind();
    }

    protected void btnAdd_Click(object sender, System.EventArgs e)
    {
        XmlDocument xmlDoc = new XmlDocument();
        xmlDoc.Load(Server.MapPath(".\\db\\dbGuest.xml"));
        XmlNode root = xmlDoc.SelectSingleNode("dbGuest");//查找<dbGuest>
        XmlElement xe1 = xmlDoc.CreateElement("User");//创建一个<User>节点
        XmlElement xesub1 = xmlDoc.CreateElement("Name");
        xesub1.InnerText = "Guset";//设置文本节点
        xe1.AppendChild(xesub1);//添加到<User>节点中
        XmlElement xesub2 = xmlDoc.CreateElement("City");
        xesub2.InnerText = "上海";
        xe1.AppendChild(xesub2);
        XmlElement xesub3 = xmlDoc.CreateElement("Email");
        xesub3.InnerText = "ss@22.net";
        xe1.AppendChild(xesub3);

        root.AppendChild(xe1);//添加到<dbGuest>节点中
        xmlDoc.Save(Server.MapPath(".\\db\\dbGuest.xml"));
        Bind();
    }
}

 

转载于:https://www.cnblogs.com/hubcarl/archive/2009/03/27/1423524.html