XML文件操作

<?xml version="1.0" standalone="yes"?>
<dbGuest>
  <User>
    <Name>shaoazhd</Name>
    <City>beijing</City>
    <Email>sss@22.net</Email>
    <Message>afsa</Message>
    <STime>2004-7-12 15:07:39</STime>
  </User>
  <User>
    <Name>Guset</Name>
    <City>上海</City>
    <Email>ss@22.net</Email>
    <Message>afsa</Message>
    <STime>2004-7-12 15:07:39</STime>
  </User>
</dbGuest>

 

        private 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;

        }

        private 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();
        }

        private 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)
                {
                    for (int i = 0; i < node.Count; i++)
                    {
                        if (node[i].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();
        }

        private 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();
        }

        private void Bind()
        {
            DataSet ds = new DataSet();
            ds.ReadXml(Server.MapPath(".\\db\\dbGuest.xml"));
            dgShow.DataSource = ds.Tables[0].DefaultView;
            dgShow.DataBind();
            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);

        }