读取、显示、插入xml文件

xml文件格式为：

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.IO;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

using System.Xml;

namespace test2016_2_21

{

    public partial class FrmXml : Form

    {

        string dbtype = "";

        string server = "";

        string login = "";

        string password = "";

        XmlDocument xmlDoc = new XmlDocument();

        string xml = @"DBConfig.xml";

        public FrmXml()

        {

            InitializeComponent();

            this.LoadData();

        }

        private void LoadData()

        {

            xmlDoc.Load("DBConfig.xml");

            StreamReader sr = new StreamReader(xml);

            this.richTextBox1.Text = sr.ReadToEnd();

            sr.Close();  

        }

        private void button1_Click(object sender, EventArgs e)

        {

            dbtype = this.tbDBType.Text;

            server = this.tbServer.Text;

            login = this.tbLogin.Text;

            password = this.tbPassword.Text;

            if (dbtype.Length != 0 && server.Length != 0 && login.Length != 0 && password.Length != 0)

            {

                

                this.InsertNode();

                this.LoadData();

            }

            else

            {

                MessageBox.Show("请输入完整信息");

            }

        }

        

        public void InsertNode()

        {

            Console.WriteLine("insert");

            XmlNode root = xmlDoc.SelectSingleNode("Config");//查找

            XmlElement xel = xmlDoc.CreateElement("DB");//创建一个db结点

            xel.SetAttribute("type", dbtype);//设置他的type属性

            XmlElement xelsbu1 = xmlDoc.CreateElement("Server");//创建一个server结点

            xelsbu1.InnerText = server;//设置他的文本

            xel.AppendChild(xelsbu1);//添加到db的子节点

            XmlElement xelsbu2 = xmlDoc.CreateElement("Login");

            xelsbu2.InnerText = login;

            xel.AppendChild(xelsbu2);

            XmlElement xelsbu3 = xmlDoc.CreateElement("Password");

            xelsbu3.InnerText = password;

            xel.AppendChild(xelsbu3);

            root.AppendChild(xel);

            xmlDoc.Save("DBConfig.xml");

            

        }

    }

}