XML创建和读取

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Text;
using System.Data;
using System.Data.SqlClient;
using System.Xml;
using System.Xml.Linq;

namespace LinqDemo
{
    public partial class LinqToXML : System.Web.UI.Page
    {
        public string SQLCONN = System.Configuration.ConfigurationManager.AppSettings["SQLCONN"].ToString();
        protected void Page_Load(object sender, EventArgs e)
        {
            string Message = string.Empty;
            if (HttpContext.Current.Request.HttpMethod == "POST")
            {
                string Command = Request["HdCommand"].ToString();
                switch (Command)
                {
                    case "CreateXML":
                        Message=CreateXML();
                        break;
                    case "ReadXML":
                        Message = ReadXML(Server.MapPath("XML/UserInfos.xml"));
                        break;
                    default:
                        break;
                }
            }
            Response.Write(Message);
        }

        #region //创建一个新的XML文件
        public string CreateXML()
        {
            string Message = string.Empty;
            try
            {
                SqlConnection conn = new SqlConnection(SQLCONN);
                conn.Open();
                string SQL = "select * from UsersInfo where User_State=1";
                SqlCommand cmd = new SqlCommand(SQL, conn);
                SqlDataReader dr = cmd.ExecuteReader();

                //XmlDocument实例化一个XML文档对象xmls
                XmlDocument xmls = new XmlDocument();
                //创建一个XML文件的根节点"root"元素
                XmlElement root = xmls.CreateElement("root");
                //添加节点属性
                //root.SetAttribute("imageWidth", "680");
                //root.SetAttribute("imageHeight", "345");
                xmls.AppendChild(root); //将根节点添加到xmlsXML文件中
                while (dr.Read())
                {
                    //创建一个XML文件的节点"root"元素
                    XmlElement UserInfo = xmls.CreateElement("UserInfo");
                    UserInfo.SetAttribute("ID", dr["ID"].ToString());
                    root.AppendChild(UserInfo);//将UserInfo节点添加到root节点下

                    //用户帐号
                    XmlElement UserCodeMenu = xmls.CreateElement("UserCode");
                    UserCodeMenu.InnerText = dr["User_Code"].ToString();
                    UserInfo.AppendChild(UserCodeMenu); //将UserCode节点添加到UserInfo节点下

                    //用户姓名
                    XmlElement UserNameMenu = xmls.CreateElement("UserName");
                    UserNameMenu.InnerText = dr["User_Name"].ToString();
                    UserInfo.AppendChild(UserNameMenu);//将UserName节点添加到UserInfo节点下

                    //用户性别
                    XmlElement UserSexMenu = xmls.CreateElement("UserSex");
                    UserSexMenu.InnerText = dr["User_Sex"].ToString();
                    UserInfo.AppendChild(UserSexMenu);//将UserSex节点添加到UserInfo节点下

                    //用户年龄
                    XmlElement UserAgeMenu = xmls.CreateElement("UserAge");
                    UserAgeMenu.InnerText = dr["User_Age"].ToString();
                    UserInfo.AppendChild(UserAgeMenu);//将UserAge节点添加到UserInfo节点下

                    //用户联系电话
                    XmlElement UserTelMenu = xmls.CreateElement("UserTel");
                    UserTelMenu.InnerText = dr["User_Tel"].ToString();
                    UserInfo.AppendChild(UserTelMenu);//将UserTel节点添加到UserInfo节点下

                    //用户邮箱
                    XmlElement UserEmaiMenu = xmls.CreateElement("UserEmail");
                    UserEmaiMenu.InnerText = dr["User_Email"].ToString();
                    UserInfo.AppendChild(UserEmaiMenu);//将UserEmail节点添加到UserInfo节点下

                    //用户地址
                    XmlElement UserAddressMenu = xmls.CreateElement("UserAddress");
                    UserAddressMenu.InnerText = dr["User_Address"].ToString();
                    UserInfo.AppendChild(UserAddressMenu);//将UserAddress节点添加到UserInfo节点下

                    //用户状态
                    XmlElement UserStateMenu = xmls.CreateElement("UserState");
                    UserStateMenu.InnerText = dr["User_State"].ToString();
                    UserInfo.AppendChild(UserStateMenu);//将UserState节点添加到UserInfo节点下

                    //用户创建时间
                    XmlElement CreateTimeMenu = xmls.CreateElement("CreateTime");
                    CreateTimeMenu.InnerText = dr["Create_Time"].ToString();
                    UserInfo.AppendChild(CreateTimeMenu);//将CreateTime节点添加到UserInfo节点下
                }
                conn.Close();
                xmls.Save(Server.MapPath("XML/UserInfos.xml"));
                Message = "创建成功！";
            }
            catch
            {
                Message = "创建失败！";
            }
            return Message;
        }
        #endregion

        #region //读取XML文件信息
        public string ReadXML(string XMLFileName)
        {
            StringBuilder str = new StringBuilder();
            //XmlDocument实例化一个XML文档对象xmls
            XmlDocument xmls = new XmlDocument();
            //XML文档对象xmls的Load方法去加载要去读的XML文件
            xmls.Load(XMLFileName);
            //根据元素标签去读取数据
            XmlNodeList userlist = xmls.GetElementsByTagName("UserInfo");
            for (int i = 0; i < userlist.Count; i++)
            {
                str.Append("用户帐号："+userlist[i].ChildNodes[0].InnerText+"-");
                str.Append("用户姓名：" + userlist[i].ChildNodes[1].InnerText + "-");
                str.Append("性别：" + userlist[i].ChildNodes[2].InnerText + "-");
                str.Append("年龄：" + userlist[i].ChildNodes[3].InnerText + "-");
                str.Append("联系电话" + userlist[i].ChildNodes[4].InnerText + "-");
                str.Append("邮箱：" + userlist[i].ChildNodes[5].InnerText + "-");
                str.Append("地址：" +userlist[i].ChildNodes[6].InnerText+"-");
                str.Append("状态：" +userlist[i].ChildNodes[7].InnerText+"-");
                str.Append("创建时间：" +userlist[i].ChildNodes[8].InnerText+" | ");
            }
            return str.ToString();
        }
        #endregion

        #region //Linq to XML 读取XML文件信息
        public string LinqReadXML(string XMLFileName)
        {
            StringBuilder str = new StringBuilder();
            XElement doc = XElement.Load(XMLFileName);
            var UserInfos = from item in doc.Descendants("UserCode") select item.Value;
            foreach (var item in UserInfos)
                str.Append(item);
            return str.ToString();
        }
        #endregion
    }
}