Winform配置文件读写操作

前言

在项目当中为了增加软件的灵活性及可配置性，配置文件在程序当中起着不可替代的作用。下面介绍一下最近用的比较多的方式。

config文件的操作

数据库连接字符串

1.获取连接字符串

 public static string GetConnectionStrings(string connectionName)
        {
            string file = Application.ExecutablePath;
            Configuration config = ConfigurationManager.OpenExeConfiguration(file);
            string connectionString = config.ConnectionStrings.ConnectionStrings[connectionName].ConnectionString.ToString();
            return connectionString;
        }

2.更新连接字符串

        ///<summary>
        ///更新连接字符串
        ///</summary>
        ///<param name="newName">连接字符串名称</param>
        ///<param name="newConString">连接字符串内容</param>
        ///<param name="newProviderName">数据提供程序名称</param>
        public static void UpdateConnectionStringsConfig(string newName, string newConString, string newProviderName)
        {
            //指定config文件读取
            string file = System.Windows.Forms.Application.ExecutablePath;
            Configuration config = ConfigurationManager.OpenExeConfiguration(file);

            bool exist = false; //记录该连接串是否已经存在
            //如果要更改的连接串已经存在
            if (config.ConnectionStrings.ConnectionStrings[newName] != null)
            {
                exist = true;
            }
            // 如果连接串已存在，首先删除它
            if (exist)
            {
                config.ConnectionStrings.ConnectionStrings.Remove(newName);
            }
            //新建一个连接字符串实例
            ConnectionStringSettings mySettings =
                new ConnectionStringSettings(newName, newConString, newProviderName);
            // 将新的连接串添加到配置文件中.
            config.ConnectionStrings.ConnectionStrings.Add(mySettings);
            // 保存对配置文件所作的更改
            config.Save(ConfigurationSaveMode.Modified);
            // 强制重新载入配置文件的ConnectionStrings配置节
            ConfigurationManager.RefreshSection("connectionStrings");
        }

        //返回config文件中AppSettings配置节的value值
        public static string GetAppConfig(string strKey)
        {
            string file = Application.ExecutablePath;
            Configuration config = ConfigurationManager.OpenExeConfiguration(file);
            foreach( string key in config.AppSettings.Settings.AllKeys)
            {
                if (key == strKey)
                {
                    return config.AppSettings.Settings[strKey].Value.ToString();
                }
            }
            return null;
        }

键值对配置

1.在配置节增加一对键值对

        /// <summary>
        /// 在appSettings配置节增加一对键值对
        /// </summary>
        /// <param name="newKey">键</param>
        /// <param name="newValue">值</param>
        public static void AddAppConfig(string newKey, string newValue)
        {
            string file = System.Windows.Forms.Application.ExecutablePath;
            Configuration config = ConfigurationManager.OpenExeConfiguration(file);
            bool exist = false;
            foreach (string key in config.AppSettings.Settings.AllKeys)
            {
                if (key == newKey)
                {
                    exist = true;
                }
            }
            if (exist)
            {
                config.AppSettings.Settings.Remove(newKey);
            }
            config.AppSettings.Settings.Add(newKey, newValue);
            config.Save(ConfigurationSaveMode.Modified);
            ConfigurationManager.RefreshSection("appSettings");
        }

2.获取配置节中键值对的值

        /// <summary>
        /// 返回config文件中AppSettings配置节的value值
        /// </summary>
        /// <param name="strKey">键</param>
        /// <returns></returns>
        public static string GetAppConfig(string strKey)
        {
            string file = Application.ExecutablePath;
            Configuration config = ConfigurationManager.OpenExeConfiguration(file);
            foreach( string key in config.AppSettings.Settings.AllKeys)
            {
                if (key == strKey)
                {
                    return config.AppSettings.Settings[strKey].Value.ToString();
                }
            }
            return null;
        }