c# enum 解析

 public enum OrderPaymentStatus
    {
        /// <summary>
        /// 未支付
        /// </summary>
        [Description("未支付")]
        No=1,
        /// <summary>
        /// 已支付
        /// </summary>
        [Description("已支付")]
        Yes
    }

public static class EnumHelper
    {
        private static Hashtable enumDesciption = EnumHelper.GetDescriptionContainer();

        public static string ToDescription(this Enum value)
        {
            if (value == null)
            {
                return "";
            }
            Type type = value.GetType();
            string name = Enum.GetName(type, value);
            return EnumHelper.GetDescription(type, name);
        }

        public static Dictionary<int, string> ToDescriptionDictionary<TEnum>()
        {
            Type typeFromHandle = typeof(TEnum);
            Array values = Enum.GetValues(typeFromHandle);
            Dictionary<int, string> dictionary = new Dictionary<int, string>();
            foreach (Enum item in values)
            {
                dictionary.Add(Convert.ToInt32(item), item.ToDescription());
            }
            return dictionary;
        }

        public static Dictionary<int, string> ToDictionary<TEnum>()
        {
            Type typeFromHandle = typeof(TEnum);
            Array values = Enum.GetValues(typeFromHandle);
            Dictionary<int, string> dictionary = new Dictionary<int, string>();
            foreach (Enum item in values)
            {
                dictionary.Add(Convert.ToInt32(item), item.ToString());
            }
            return dictionary;
        }

        private static bool IsIntType(double d)
        {
            return (double)(int)d != d;
        }

        private static Hashtable GetDescriptionContainer()
        {
            EnumHelper.enumDesciption = new Hashtable();
            return EnumHelper.enumDesciption;
        }

        private static void AddToEnumDescription(Type enumType)
        {
            EnumHelper.enumDesciption.Add(enumType, EnumHelper.GetEnumDic(enumType));
        }

        private static Dictionary<string, string> GetEnumDic(Type enumType)
        {
            Dictionary<string, string> dictionary = new Dictionary<string, string>();
            FieldInfo[] fields = enumType.GetFields();
            FieldInfo[] array = fields;
            foreach (FieldInfo fieldInfo in array)
            {
                if (fieldInfo.FieldType.IsEnum)
                {
                    object[] customAttributes = fieldInfo.GetCustomAttributes(typeof(DescriptionAttribute), false);
                    dictionary.Add(fieldInfo.Name, ((DescriptionAttribute)customAttributes[0]).Description);
                }
            }
            return dictionary;
        }

        private static string GetDescription(Type enumType, string enumText)
        {
            if (string.IsNullOrEmpty(enumText))
            {
                return null;
            }
            if (!EnumHelper.enumDesciption.ContainsKey(enumType))
            {
                EnumHelper.AddToEnumDescription(enumType);
            }
            object obj = EnumHelper.enumDesciption[enumType];
            if (obj != null && !string.IsNullOrEmpty(enumText))
            {
                Dictionary<string, string> dictionary = (Dictionary<string, string>)obj;
                return dictionary[enumText].Split(‘|‘)[0];
            }
            throw new ApplicationException("不存在枚举的描述");
        }
    }