Enum 扩展

项目中，用到枚举值，并且增加中英文描述。

一般的[Description]属性，无法满足中英文，所以进行了简单扩展。

继承DescriptionAttribute，增加了英文描述descriptionEN

public class BaseDescriptionAttribute : DescriptionAttribute
        {
            public BaseDescriptionAttribute(string descriptionCN)
                : base(descriptionCN)
            {
            }
            public BaseDescriptionAttribute(string descriptionCN, string descriptionEN)
                : base(descriptionCN)
            {
                this.descriptionEN = descriptionEN;
            }

            private string descriptionEN;

            public string DescriptionEN
            {
                get { return descriptionEN; }
                set { descriptionEN = value; }
            }

        }

增加一个操作类：public static class EnumOperate

GetBaseDescription：操作BaseDescriptionAttribute

GetDescription：操作DescriptionAttribute

EnumToDictionary：获取枚举值的key和value

GetEnumItems：获取枚举的相关信息（key，value，中文描述，英文描述）

public static class EnumOperate
    {

        /// <summary>
        /// 扩展方法，获得枚举的Description
        /// </summary>
        /// <param name="value">枚举值</param>
        /// <param name="nameInstead">当枚举值没有定义DescriptionAttribute，是否使用枚举名代替，默认是使用</param>
        /// <returns>枚举的Description</returns>
        public static EnumItem GetBaseDescription(this Enum value, Boolean nameInstead = true)
        {
            EnumItem e = new EnumItem();

            Type type = value.GetType();
            string name = Enum.GetName(type, value);
            if (name == null)
            {
                return null;
            }

            FieldInfo field = type.GetField(name);
            BaseDescriptionAttribute attribute = Attribute.GetCustomAttribute(field, typeof(BaseDescriptionAttribute)) as BaseDescriptionAttribute;

            if (attribute == null && nameInstead == true)
            {
                e.DescriptionCN = name;
                e.DescriptionEN = name;
                return e;
            }
            else
            {
                e.DescriptionCN = attribute.Description;
                e.DescriptionEN = attribute.DescriptionEN;
                return e;
            }

        }

        /// <summary>
        /// 扩展方法，获得枚举的Description
        /// </summary>
        /// <param name="value">枚举值</param>
        /// <param name="nameInstead">当枚举值没有定义DescriptionAttribute，是否使用枚举名代替，默认是使用</param>
        /// <returns>枚举的Description</returns>
        public static string GetDescription(this Enum value, Boolean nameInstead = 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 && nameInstead == true)
            {
                return name;
            }
            return attribute == null ? null : attribute.Description;
        }

        /// <summary>
        /// 把枚举转换为键值对集合
        /// 枚举转换为键值对集合
        ///  Dictionary<Int32, String> dic = EnumUtil.EnumToDictionary(typeof(Season), e => e.GetDescription());
        /// </summary>
        /// <param name="enumType">枚举类型</param>
        /// <param name="getText">获得值得文本</param>
        /// <returns>以枚举值为key，枚举文本为value的键值对集合</returns>
        public static Dictionary<Int32, String> EnumToDictionary(Type enumType, Func<Enum, String> getText)
        {
            if (!enumType.IsEnum)
            {
                throw new ArgumentException("传入的参数必须是枚举类型！", "enumType");
            }
            Dictionary<Int32, String> enumDic = new Dictionary<int, string>();
            Array enumValues = Enum.GetValues(enumType);
            foreach (Enum enumValue in enumValues)
            {
                Int32 key = Convert.ToInt32(enumValue);
                String value = getText(enumValue);
                enumDic.Add(key, value);
            }
            return enumDic;
        }

        /// <summary>
        /// 获取枚举的相关信息
        /// </summary>
        /// <param name="e">枚举的类型</param>
        /// <returns></returns>
        public static List<EnumItem> GetEnumItems(Type e)
        {
            List<EnumItem> itemList = new List<EnumItem>();
            foreach (Enum v in Enum.GetValues(e))
            {
                EnumItem item = new EnumItem();
                // TODO: 遍历操作
                item.EnumKey = Convert.ToInt32(v);
                item.EnumValue = v.ToString();
                item.DescriptionCN = GetBaseDescription(v).DescriptionCN;
                item.DescriptionEN = GetBaseDescription(v).DescriptionEN;
                itemList.Add(item);
            }
            return itemList;

        }

        public class EnumItem
        {
            public int EnumKey { get; set; }
            public string EnumValue { get; set; }
            public string DescriptionCN { get; set; }
            public string DescriptionEN { get; set; }
        }
    }

一些基本方法，参考了 http://www.cnblogs.com/lyl6796910/p/3958768.html

实际运用：

获取某个枚举类的全部信息

static void Main(string[] args)
        {
            var q = EnumOperate.GetEnumItems(typeof(WMS_Invoicing));

            Console.ReadLine();

        }

public enum WMS_Invoicing
        {
            //入库
            [TestApp.Program.BaseDescription("In","InEn")]
            Input = 1,

            //出库
            [TestApp.Program.BaseDescription("Out", "OutEn")]
            Output = 2,

            //修正
            [TestApp.Program.BaseDescription("Corrected", "123")]
            Corrected = 3,

            //损耗
            [TestApp.Program.BaseDescription("Loss", "haha")]
            Loss = 4,

        }