[C#]appSettings节点读取与修改

关键代码：

        public static string GetAppSettingsValue(string key)
        {
            ConfigurationManager.RefreshSection("appSettings");
            return ConfigurationManager.AppSettings[key] ?? string.Empty;
        }
        public static bool UpdateAppSettings(string key, string value)
        {
            var _config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
            if (!_config.HasFile)
            {
                throw new ArgumentException("程序配置文件缺失！");
            }
            KeyValueConfigurationElement _key = _config.AppSettings.Settings[key];
            if (_key == null)
                _config.AppSettings.Settings.Add(key, value);
            else
                _config.AppSettings.Settings[key].Value = value;
            _config.Save(ConfigurationSaveMode.Modified);
            return true;
        }

希望有所帮助！
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