配置文件appSettings节点和connectionStrings节点操作工具类

public class OperateConfigFile
    {
        private Configuration config;
        #region 有参构造函数
        /// <summary>
        /// 构造函数，有参数(其他应用程序的虚拟路径)
        /// </summary>
        /// <param name="path">其他应用程序的虚拟路径</param>
        public OperateConfigFile(string path)
        {
            config = WebConfigurationManager.OpenWebConfiguration(path);
        }
        #endregion
        #region 无参构造函数
        /// <summary>
        /// 构造函数，无参数
        /// </summary>
        public OperateConfigFile()
        {
            this.config = WebConfigurationManager.OpenWebConfiguration("~");
        }
        #endregion
        #region appSettings节点操作
        #region 读取appSettings节点key对应的值
        /// <summary>
        /// 读取appSettings节点key对应的值
        /// </summary>
        /// <param name="key"></param>
        /// <param name="path"></param>
        /// <returns></returns>
        public static string getValue(string key, string path)
        {
            return ConfigurationManager.AppSettings[key] ?? "";
        }
        #endregion
        #region 创建或更新appSettings节点值
        /// <summary>
        /// 创建或更新appSettings节点值
        /// </summary>
        /// <param name="key"></param>
        /// <param name="value"></param>
        public void updateValue(string key, string value)
        {
            AppSettingsSection appSettings = (AppSettingsSection)config.GetSection("appSettings");
            //不存在就创建
            if (appSettings.Settings[key] == null)
            {
                config.AppSettings.Settings.Add(key, value);
            }
            //存在就更新
            else
            {
                config.AppSettings.Settings[key].Value = value;
            }
            config.Save();
        }
        #endregion
        #region 删除当前或者其他应用程序配置文件中的appSettings节点
        /// <summary>
        /// 定义删除当前或者其他应用程序配置文件中的appSettings节点
        /// </summary>
        /// <param name="key">keyName</param>
        /// <returns>删除成功返回true，删除失败返回false</returns>
        public bool RemoveAppSettingsSection(string key)
        {
            AppSettingsSection appSettings = (AppSettingsSection)config.GetSection("appSettings");
            if (appSettings.Settings[key] != null)
            {
                appSettings.Settings.Remove(key);
                config.Save();
                return true;
            }
            else
            {
                return false;
            }

        }
        #endregion
        #endregion
        #region connectionStrings节点操作
        #region 获取当前或其他应用程序配置文件中connectionStrings节点的所有ConnectionString
        /// <summary>
        /// 定义获取当前或其他应用程序配置文件中connectionStrings节点的所有ConnectionString
        /// </summary>
        /// <returns>返回connectionStrings节点的所有ConnectionString</returns>
        public string[] ALLConnectionStrings()
        {
            ConnectionStringsSection conSection = (ConnectionStringsSection)config.GetSection("connectionStrings");
            ConnectionStringSettingsCollection conCollection = conSection.ConnectionStrings;
            string[] conStrings = new string[conSection.ConnectionStrings.Count];
            int i = 0;
            foreach (ConnectionStringSettings conSetting in conCollection)
            {
                conStrings[i++] = conSetting.ConnectionString;
            }
            return conStrings;
        }
        #endregion
        #region 设置当前或其他应用程序配置文件中ConnectionString节点
        /// <summary>
        /// 定义设置当前或其他应用程序配置文件中ConnectionString节点
        /// </summary>
        /// <param name="name">connectionStrings Name</param>
        /// <param name="ConnectionString">connectionStrings ConnectionString</param>
        /// <param name="providerName">connectionStrings ProviderName</param>
        public void SetConnectionStringsSection(string name, string ConnectionString, string providerName)
        {
            ConnectionStringsSection conSection = (ConnectionStringsSection)config.GetSection("connectionStrings");
            if (conSection.ConnectionStrings[name] != null)
            {
                conSection.ConnectionStrings[name].ConnectionString = ConnectionString;
                conSection.ConnectionStrings[name].ProviderName = providerName;
                this.Save();
            }
            else
            {

                ConnectionStringSettings conSettings = new ConnectionStringSettings(name, ConnectionString, providerName);
                conSection.ConnectionStrings.Add(conSettings);
                this.Save();
            }
        }
        #endregion
        #region 删除当前或其他应用程序配置文件中ConnectionString节点
        /// <summary>
        /// 定义删除当前或其他应用程序配置文件中ConnectionString节点
        /// </summary>
        /// <param name="name">ConnectionStrings Name</param>
        /// <returns>删除成功返回true，删除失败返回false</returns>
        public bool RemoveConnectionStringsSection(string name)
        {
            ConnectionStringsSection conSection = (ConnectionStringsSection)config.GetSection("connectionStrings");
            if (conSection.ConnectionStrings[name] != null)
            {
                conSection.ConnectionStrings.Remove(name);
                this.Save();
                return true;
            }
            else
            {
                return false;
            }
        }
        #endregion


        #endregion
        #region 保存配置文件，并重新赋值config为null
        /// <summary>
        /// 定义保存配置文件的方法
        /// </summary>
        public void Save()
        {
            config.Save();
            config = null;
        }
        #endregion
        #region 清空配置文件
        /// <summary>
        /// 清空配置文件
        /// </summary>
        public void clear()
        {
            this.config.AppSettings.Settings.Clear();
            config.Save();
        }
        #endregion
    }

所发代码为本人项目中所运用，非转载，保证质量