C# XML文件操作

XML文件内容样例

<?xml version="1.0" encoding="utf-8"?>
<DataBaseInfo>
  <Ad>
    <ServerName>172.16.78.198</ServerName>
    <UserName>sa</UserName>
    <UserPwd>1</UserPwd>
    <DataBase>dcdemo</DataBase>
  </Ad>
</DataBaseInfo>

创建XML文件，写入XML文件，读取XML文件

        /// <summary>
        /// 创建XML文件
        /// </summary>
        /// <param name="filename"></param>
        public static void CreateXmlFile(string filename, string Server, string User, string Pwd, string DataBase)
        {
            XmlDocument xmldoc = new XmlDocument();
            XmlNode node;
            node = xmldoc.CreateXmlDeclaration("1.0", "utf-8", null);
            xmldoc.AppendChild(node);
            //创建根节点
            XmlNode root = xmldoc.CreateElement("DataBaseInfo");
            xmldoc.AppendChild(root);

            XmlNode node1 = xmldoc.CreateNode(XmlNodeType.Element, "Ad", null);
            CreateNode(xmldoc, node1, "ServerName", Server);
            CreateNode(xmldoc, node1, "UserName", User);
            CreateNode(xmldoc, node1, "UserPwd", Pwd);
            CreateNode(xmldoc, node1, "DataBaee", DataBase);
            root.AppendChild(node1);
            try
            {
                xmldoc.Save(filename);

            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        /// <summary>
        /// 写入XML文件
        /// </summary>
        /// <param name="file"></param>
        public static void WriteXmlFile(string file, string Server, string User, string Pwd, string DataBase)
        {
            XmlDocument xmdoc = new XmlDocument();
            try
            {
                xmdoc.Load(file);
                XmlNode root = xmdoc.SelectSingleNode("DataBaseInfo");

                if (root != null)
                {
                    XmlNode node = xmdoc.CreateNode(XmlNodeType.Element, "Ad", null);
                    CreateNode(xmdoc, node, "ServerName", Server);
                    CreateNode(xmdoc, node, "UserName", User);
                    CreateNode(xmdoc, node, "UserPwd", Pwd);
                    CreateNode(xmdoc, node, "DataBaee", DataBase);
                    root.AppendChild(node);
                }
                xmdoc.Save(file);

            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        /// <summary>
        /// 创建节点
        /// </summary>
        /// <param name="xmldoc"></param>
        /// <param name="parentnode"></param>
        /// <param name="name"></param>
        /// <param name="value"></param>
        public static void CreateNode(XmlDocument xmldoc, XmlNode parentnode, string name, string value)
        {
            XmlNode node = xmldoc.CreateNode(XmlNodeType.Element, name, null);
            node.InnerText = value;
            parentnode.AppendChild(node);
        }

        /// <summary>
        /// 获取登录到数据库的用户名
        /// </summary>
        public static string GetDBUserName(string DataBaseInfo)
        {
            //string DataBaseInfo = Application.StartupPath;
            DataBaseInfo = DataBaseInfo + "\\DataBase.xml";
            string dbUser = "";
            if (File.Exists(DataBaseInfo))
            {
                XmlDocument xmdoc = new XmlDocument();
                xmdoc.Load(DataBaseInfo);
                //搜索指定的节点
                System.Xml.XmlNodeList nodes = xmdoc.SelectNodes("//Ad");
                if (nodes != null)
                {
                    foreach (System.Xml.XmlNode xn in nodes)
                    {
                        dbUser = xn.SelectSingleNode("UserName").InnerText.ToString();
                    }
                }
            }
            return dbUser;

        }
         /// <summary>
         /// 读取XML文档
         /// </summary>
        public static DataTable GetSelectedProduceInfo(string produceInfo, string produceNum)
        {
            //string produceInfo = Application.StartupPath;
            produceInfo = produceInfo + "\\ProduceInfo.xml";

            DataTable dt = new DataTable();
            if (File.Exists(produceInfo))
            {
                XmlDocument xmdoc = new XmlDocument();
                xmdoc.Load(produceInfo);

                DataRow dr;
                dt.Columns.Add("ProduceNum", typeof(string));//产品编号
                dt.Columns.Add("ProduceName", typeof(string));//产品名称
                dt.Columns.Add("ProduceSelect", typeof(string));//是否被选择
                dt.Columns.Add("ProduceSelectStart", typeof(string));//是否默认启动
                dt.Columns.Add("ProducePath", typeof(string));

                dt.Columns.Add("ProduceModuleStart", typeof(string));
                dr = dt.NewRow();

                System.Xml.XmlNodeList nodes = xmdoc.SelectNodes("//Ad");
                if (nodes != null)
                {
                    foreach (System.Xml.XmlNode xn in nodes)
                    {
                        if (xn.SelectSingleNode("ProduceNum").InnerText.ToString() == produceNum)
                        {
                            dr[0] = xn.SelectSingleNode("ProduceNum").InnerText.ToString();
                            dr[1] = xn.SelectSingleNode("ProduceName").InnerText.ToString();
                            dr[2] = xn.SelectSingleNode("ProduceSelect").InnerText.ToString();
                            dr[3] = xn.SelectSingleNode("ProduceSelectStart").InnerText.ToString();
                            dr[4] = xn.SelectSingleNode("ProducePath").InnerText.ToString();
                            dr[5] = xn.SelectSingleNode("ProduceModuleStart").InnerText.ToString();

                            if (dr != null)
                            {
                                dt.Rows.Add(dr);
                            }
                            break;
                        }
                    }
                }
            }
            return dt;
        }