c# 操作临时数据---XML操作

 class Config
    {
        static string path;
        /// <summary>
        /// 配置文件的路径
        /// </summary>
        public static string Path
        {
            get { return path; }
            set { path = value; }
        }
        private XmlDocument xml;
        private static Config instance;

        /// <summary>
        /// 单件实例
        /// </summary>
        public static Config Instance
        {
            get
            {
                if (instance == null)
                    instance = new Config();
                return instance;
            }
        }

        private Config()
        {
            items = new Hashtable();
            xml = new XmlDocument();
            if (!System.IO.File.Exists(path))
            {
                xml.AppendChild(xml.CreateXmlDeclaration("1.0", "utf-8", null));
                xml.AppendChild(xml.CreateElement("Config"));
                try
                {
                    string dir = System.IO.Path.GetDirectoryName(path);
                    if (!System.IO.Directory.Exists(dir))
                        System.IO.Directory.CreateDirectory(dir);
                }
                catch { }
            }
            else
            {
                try
                {
                    xml.Load(path);
                }
                catch (XmlException)
                {
                    //如果 Xml 读取失败， 则重新创建
                    xml.AppendChild(xml.CreateXmlDeclaration("1.0", "utf-8", null));
                    xml.AppendChild(xml.CreateElement("Config"));
                }
            }
        }

        /// <summary>
        /// 储存
        /// </summary>
        public void Save()
        {
            foreach (object key in items.Keys)
            {
                XmlNode node = xml.DocumentElement.SelectSingleNode("Item[@Name='" + key.ToString() + "']");
                if (node == null)
                {
                    node = xml.CreateElement("Item");
                    XmlAttribute att = xml.CreateAttribute("Name");
                    att.Value = key.ToString();
                    node.Attributes.Append(att);
                    xml.DocumentElement.AppendChild(node);
                }
                node.InnerText = items[key].ToString();
            }

            xml.Save(path);
            items.Clear();
        }

        /// <summary>
        /// 读取和存储
        /// </summary>
        /// <param name="index"></param>
        /// <returns></returns>
        public string this[string key]
        {
            get
            {
                if (items.Contains(key))
                {
                    return items[key].ToString();
                }
                else
                {
                    XmlNode node = xml.DocumentElement.SelectSingleNode("Item[@Name='" + key + "']");
                    if (node == null)
                        return null;
                    return node.InnerText;
                }
            }
            set
            {
                items[key] = value;
            }
        }

        /// <summary>
        /// 储存值的链表
        /// </summary>
        private Hashtable items;
    }

读取xml内容：

 Config.Path = Path.Combine(Environment.CurrentDirectory, "config.xml");
 runTime = Convert.ToDateTime(Config.Instance["RunTime"]); //获取每日运行时间
 todayDone = Config.Instance["TodayDone"]; //获取今日是否完成的标识

写入：

 #region 修改配置文件
        public static bool ChangeConfig(string AppKey, string AppValue)
        {
            Config.Instance[AppKey] = AppValue;
            Config.Instance.Save();
            return true;
        }
        #endregion

ChangeConfig("TodayDone", "");