枚舉擴展方法獲取枚舉Description

枚舉擴展方法

 /// <summary>
        /// 擴展方法，獲得枚舉的Description
        /// </summary>
        /// <param name="value">枚舉值</param>
        /// <param name="nameInstend">當枚舉沒有定義DescriptionAttribute,是否用枚舉名代替，默認使用</param>
        /// <returns>枚舉的Description</returns>
        public static string GetDescription(this Enum value, bool nameInstend = true)
        {
            Type type = value.GetType();
            string name = Enum.GetName(type, value);
            if (name==null)
            {
                return null;
            }
            FieldInfo field = type.GetField(name);
            DescriptionAttribute attribute = Attribute.GetCustomAttribute(field, typeof(DescriptionAttribute)) as DescriptionAttribute;
            if (attribute==null&&nameInstend==true)
            {
                return name;
            }
            return attribute==null? null :attribute.Description;
        }

枚舉類

 public enum WeekDay
    {
        [Description("星期一")]
        one=1,
        [Description("星期二")]
        two =2,
        three=3,
        four=4,
        five=5,
        six=6,
        seven=7

    }

測試

           //枚舉測試
            WeekDay w1 = WeekDay.one;
            string strw1 = w1.GetDescription();// strw1= “星期一”

            WeekDay w3 = WeekDay.three;
            string strw2 = w3.GetDescription();// strw3=“three”