C# 枚举

命名空间：

　　using System.Runtime.Serialization;

　　using System.Reflection;

1.定义枚举　　

    /// <summary>
    /// 银行简码
    /// </summary>
    [DataContract]
    public enum BankCode
    {
        [EnumMember]
        [Description("中行")]
        boc = 95559,

        [EnumMember] 
        [Description("工行")] 
        icbc = 95588,

        [EnumMember] 
        [Description("交行")] 
        comm = 95566
    }
        

2.将枚举转换为DataTable，并读取枚举的描述(Description)值

        /// <summary>
        /// 将枚举转换为DataTable
        /// </summary>
        /// <param name="source"></param>
        /// <returns></returns>
        public static DataTable ConvertEnumToDataTable(Type source)
        {
            DataTable dt = new DataTable();
            dt.Columns.Add("name");
            dt.Columns.Add("value");
            dt.Columns.Add("Desc");
            foreach (string name in Enum.GetNames(source))
            {
                object enumValue = Enum.Parse(source, name);
                DataRow dr = dt.Rows.Add();
                dr[0] = name;
                dr[1] = (int)enumValue;
                dr[2] = GetEnumDesc(source, name);
            }
            return dt;
        }


        /// <summary>
        /// 读取枚举的Description
        /// </summary>
        /// <param name="source">枚举Type</param>
        /// <param name="enumName">需要读取</param>
        /// <returns></returns>
        public static string GetEnumDesc(Type source,string enumName)
        {
            FieldInfo[] fieldinfo = source.GetFields();
            foreach (FieldInfo item in fieldinfo)
            {
                if (item.Name != enumName) continue;
                Object[] obj = item.GetCustomAttributes(typeof (DescriptionAttribute), false);
                if (obj.Length == 0) continue;
                DescriptionAttribute desc = (DescriptionAttribute) obj[0];
                return desc.Description;
            }
            return enumName;
        }        

    调用示例：DataTable dt = ConvertEnumToDataTable(typeof (BankCode));

3.根据枚举读取枚举值

    A:public void GetBankValue(BankCode bankCode)
    {
            int result = 0;
            switch (bankCode)
            {
                case BankCode.boc:
                    {
                        result = (int)BankCode.boc;
                        break;
                    }
                case BankCode.comm:
                    {
                        result = (int)BankCode.comm;
                        break;
                    }
                case BankCode.icbc:
                    {
                        result = (int)BankCode.icbc;
                        break;
                    }
            }
            return result;
    }

    B:public static int GetBankValue(string bankCode)
    {
            foreach (var item in Enum.GetNames(typeof(BankCode)))
            {
                if (item == bankCode)
                {
                    return (int) Enum.Parse(typeof (BankCode), item);
                }
            }
            return 0;
        }

    A,B两种方法
   其中A方法的略处在于当枚举如增加时，需要更改方法。
   另B方法，则无需更改。