修改外部AppSetting的内容

        /// <summary>
        /// 修改AppSetting
        /// </summary>
        /// <param name="key"></param>
        /// <param name="value"></param>
        public static bool ModifyAppSetting(string appPath, string key, string value)
        {
            try
            {
                System.Configuration.Configuration config =
                            ConfigurationManager.OpenExeConfiguration(appPath);
                config.AppSettings.Settings[key].Value = value;
                config.Save(ConfigurationSaveMode.Minimal);// .Modified);
                return true;
            }
            catch(Exception ex)
            {
                return false;
            }

        }