enum value map to string

EnumExtensions.cs

        /// <summary>
        /// http://stackoverflow.com/questions/2787506/cast-string-to-enum-with-enum-attribute
        /// todo: http://www.cnblogs.com/smalldust/archive/2006/04/25/384657.html 利用缓存优化
        /// </summary>
        /// <param name="value"></param>
        /// <returns></returns>
        public static string GetDescription(this Enum value)
        {
            if (value == null)
            {
                throw new ArgumentNullException("value");
            }

            string description = value.ToString();
            FieldInfo fieldInfo = value.GetType().GetField(description);
            DescriptionAttribute[] attributes =
               (DescriptionAttribute[])
             fieldInfo.GetCustomAttributes(typeof(DescriptionAttribute), false);

            if (attributes != null && attributes.Length > 0)
            {
                description = attributes[0].Description;
            }
            return description;
        }