C# 获取 appSettings 公共类

 
    public static class PublicAppSettings
    {
        /// <summary>
        /// 修改AppSettings中配置
        /// </summary>
        /// <param name="key">key值</param>
        /// <param name="value">相应值</param>
        public static bool SetConfigValue(string key, string value)
        {
            try
            {
                Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
                if (config.AppSettings.Settings[key] != null)
                    config.AppSettings.Settings[key].Value = value;
                else
                    config.AppSettings.Settings.Add(key, value);
                config.Save(ConfigurationSaveMode.Modified);
                ConfigurationManager.RefreshSection("appSettings");
                return true;
            }
            catch
            {
                return false;
            }
        }
        /// <summary>
        /// 获取AppSettings中某一节点值
        /// </summary>
        /// <param name="key"></param>
        public static string GetConfigValue(string key)
        {
            Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
            if (config.AppSettings.Settings[key] != null)
                return config.AppSettings.Settings[key].Value;
            else
                return string.Empty;
        }
        /// <summary>
        /// 获取AppSettings中某一节点值
        /// </summary>
        /// <param name="key"></param>
        public static T GetConfigValue<T>(string key)
        {
            try
            {
                Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
                if (config.AppSettings.Settings[key] != null)
                {
                    string value = config.AppSettings.Settings[key].Value;
                    T ret = (T)Convert.ChangeType(value, typeof(T));
                    return ret;
                }
            }
            catch { }
            return default(T);
        }
    }