C# XMLOperate

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Xml;



using System.IO;

using System.Windows.Forms;



namespace ResultsManage

{

    class XMLOperate

    {

        private string m_configPath = Application.StartupPath + @"\DatabaseConfig.xml";

        private string vertion = "1.0";

        private string encoding = "UTF-8";

        private string standalone = "no";

        private string comment = "database config";



        private XmlDocument xmlDoc = null;



        private static XMLOperate XmlOp = null;

        public static XMLOperate GetInstance()

        {

            if (null == XmlOp)

            {

                XmlOp = new XMLOperate(null);

            }

            return XmlOp;

        }



        public string _Vertion

        {

            set

            {

                vertion = value;

            }



            get

            {

                return vertion;

            }

        }



        public string _Encoding

        {

            set

            {

                encoding = value;

            }



            get

            {

                return encoding;

            }

        }



        public string _Standalone

        {

            set

            {

                standalone = value;

            }



            get

            {

                return standalone;

            }

        }



        public string _Comment

        {

            set

            {

                comment = value;

            }



            get

            {

                return comment;

            }

        }



        public string _ConfigPath

        {

            get

            {

                return m_configPath;

            }

        }

        

        #region  

        public XMLOperate(string xmlPath)

        {

            if (!string.IsNullOrEmpty(xmlPath))

            {

                m_configPath = xmlPath;

            }

            xmlDoc = new XmlDocument();

        }

        #endregion





        // configxml 

        public void CreateConfigXml()

        {

            xmlDoc.CreateXmlDeclaration(vertion, encoding, standalone);

            xmlDoc.CreateComment(comment);



            XmlElement rootEle = xmlDoc.CreateElement("Connection");

            xmlDoc.AppendChild(rootEle);



            XmlElement ele = xmlDoc.CreateElement("Server");

            rootEle.AppendChild(ele);

            ele = xmlDoc.CreateElement("Instance");

            rootEle.AppendChild(ele);

            ele = xmlDoc.CreateElement("Database");

            rootEle.AppendChild(ele);

            ele = xmlDoc.CreateElement("UserName");

            rootEle.AppendChild(ele);

            //ele = xmlDoc.CreateElement("Password");

            //rootEle.AppendChild(ele);

            ele = xmlDoc.CreateElement("Vertion");

            rootEle.AppendChild(ele);



            xmlDoc.Save(m_configPath);



            // XML ,<?xml version="1.0" encoding="utf-8"?>

//            xmlDoc.LoadXml(@"<?xml version=""1.0"" encoding=""utf-8""?>

//                <Connection>

//                </Connection>");

//            XmlNode root = xmlDoc.SelectSingleNode("Connection");

        }



        // 

        public bool IsExist()

        {

            if(!File.Exists(m_configPath))

            {

                return false;

            }

            return true;

        }



        // 、 xml 

        public bool UpdateConfigInfo(string server, string instance, string database, string username, string password, string version)

        {

            if (!IsExist())

            {

               return false;

            }

            XmlNode root = xmlDoc.SelectSingleNode("Connection");

            XmlNode xnd = root.SelectSingleNode("Server");

            xnd.InnerText = server;

            xnd = root.SelectSingleNode("Instance");

            xnd.InnerText = instance;

            xnd = root.SelectSingleNode("Database");

            xnd.InnerText = database;

            xnd = root.SelectSingleNode("UserName");

            xnd.InnerText = username;

            //xnd = root.SelectSingleNode("Password");

            //xnd.InnerText = password;

            xnd = root.SelectSingleNode("Vertion");

            if (!string.IsNullOrEmpty(version))

            {

                xnd.InnerText = version;

            }

            

            xmlDoc.Save(m_configPath);

            return true;

        }



        /// <summary>

        ///  

        /// </summary>

        /// <returns></returns>

        public string ReadConfigInfo(string item)

        {

            if (!IsExist())

            {

                MessageBox.Show(" ！", " ：", MessageBoxButtons.OK, MessageBoxIcon.Warning);

                return null;

            }



            xmlDoc.Load(m_configPath);

            XmlNode root = xmlDoc.SelectSingleNode("Connection");

            XmlNode xnd = root.SelectSingleNode(item);

            return xnd.InnerText;

        }



    }

}