public class ConfigOperator  {    #region 從配置文件獲取Value    /// <summary>    /// 從配置文件獲取Value    /// </summary>    /// <param name="key">配置文件中key字符串</param>    /// <returns></returns>    public static string GetValueFromConfig(string key)    {      try      {        Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);        //獲取AppSettings的節點         AppSettingsSection appsection = (AppSettingsSection)config.GetSection("appSettings");        return appsection.Settings[key].Value;      }      catch      {        return "";      }    }    #endregion    #region 設置配置文件    /// <summary>    /// 設置配置文件    /// </summary>    /// <param name="key">配置文件中key字符串</param>    /// <param name="value">配置文件中value字符串</param>    /// <returns></returns>    public static bool SetValueFromConfig(string key, string value)    {      try      {        //打開配置文件         Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);        //獲取AppSettings的節點         AppSettingsSection appsection = (AppSettingsSection)config.GetSection("appSettings");        appsection.Settings[key].Value = value;        config.Save();        return true;      }      catch      {        return false;      }    }    #endregion