C#扩展枚举的别名

C#扩展枚举的别名

用途:

1. 提高代码的可读性.
2. 打印到日志系统，方便于调试.

代码:

1. 首先编写一个Attribute

[AttributeUsage(AttributeTargets.Enum | AttributeTargets.Field, AllowMultiple = false, Inherited = false)]
    public class MemberStrAttribute : Attribute
    {
        public MemberStrAttribute(string str)
        {
            MemberStr = str;
        }

        public string MemberStr { get; private set; }
    }

2. 为枚举扩展一个方法来获取自定义属性的特定值

    public static class EnumExtend
    {
        public static string MemberStr(this Enum value)
        {
            FieldInfo fi = value.GetType().GetField(value.ToString());
            MemberStrAttribute[] attrs =
                fi.GetCustomAttributes(typeof(MemberStrAttribute), false) as MemberStrAttribute[];
            if (attrs.Length > 0) return attrs[0].MemberStr;

            return value.ToString();
        }
    }

3. 使用例程和输出

public enum Test
{
    [MemberStr("男的")]
    A,
    [MemberStr("女的")]
    B,
    [MemberStr("不男不女的")]
    C
}

Test test = Test.A;
Console.WriteLine(test.MemberStr());
test = Test.B;
Console.WriteLine(test.MemberStr());
test = Test.C;
Console.WriteLine(test.MemberStr());

男的
女的
不男不女的