public class ConfigurationRef    {        /// <summary>        /// 根据键值获取配置文件        /// </summary>        /// <param name="key">键值</param>        /// <returns></returns>        public static string GetConfig(string key)        {            string val = string.Empty;            if (WebConfigurationManager.AppSettings.AllKeys.Contains(key))                val = WebConfigurationManager.AppSettings[key];            return val;        }        /// <summary>        /// 获取所有配置文件        /// </summary>        /// <returns></returns>        public static Dictionary<string, string> GetConfig()        {            Dictionary<string, string> dict = new Dictionary<string, string>();            foreach (string key in WebConfigurationManager.AppSettings.AllKeys)                dict.Add(key, WebConfigurationManager.AppSettings[key]);            return dict;        }        /// <summary>        /// 根据键值获取配置文件        /// </summary>        /// <param name="key">键值</param>        /// <param name="defaultValue">默认值</param>        /// <returns></returns>        public static string GetConfig(string key, string defaultValue)        {            string val = defaultValue;            if (WebConfigurationManager.AppSettings.AllKeys.Contains(key))                val = WebConfigurationManager.AppSettings[key];            if (val == null)                val = defaultValue;            return val;        }        /// <summary>        /// 写配置文件,如果节点不存在则自动创建        /// </summary>        /// <param name="key">键值</param>        /// <param name="value">值</param>        /// <returns></returns>        public static bool SetConfig(string key, string value)        {            try            {                Configuration conf = WebConfigurationManager.OpenWebConfiguration("~");                if (!conf.AppSettings.Settings.AllKeys.Contains(key))                    conf.AppSettings.Settings.Add(key, value);                else                    conf.AppSettings.Settings[key].Value = value;                conf.Save();                return true;            }            catch { return false; }        }        /// <summary>        /// 写配置文件(用键值创建),如果节点不存在则自动创建        /// </summary>        /// <param name="dict">键值集合</param>        /// <returns></returns>        public static bool SetConfig(Dictionary<string, string> dict)        {            try            {                if (dict == null || dict.Count == 0)                    return false;                Configuration conf = WebConfigurationManager.OpenWebConfiguration("~");//ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);                foreach (string key in dict.Keys)                {                    if (!conf.AppSettings.Settings.AllKeys.Contains(key))                        conf.AppSettings.Settings.Add(key, dict[key]);                    else                        conf.AppSettings.Settings[key].Value = dict[key];                }                conf.Save();                return true;            }            catch { return false; }        }    }