euumに設定してあるDescription属性を取得する方法

gistfile1.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ComponentModel;
using System.Reflection;

namespace EnumDescriptionSample
{
    class Program
    {
        enum Signal : int
        {
            [Description("赤信号")]
            RED = 1,

            [Description("黄信号")]
            YELLOW = 2,

            //[Description("青信号")]
            BULE = 3
        }

        private string GetEnumDescription(Signal value)
        {
            FieldInfo fi = value.GetType().GetField(value.ToString());

            var attributes = (DescriptionAttribute[])fi.GetCustomAttributes(typeof(DescriptionAttribute), false);

            var desciptionString = attributes.Select(n=>n.Description)
                              .FirstOrDefault();
            if (desciptionString != null)
            {
                return desciptionString;
            }
            return value.ToString();
        }

        static void Main(string[] args)
        {
            var signal = new Program();
            Console.WriteLine(signal.GetEnumDescription(Signal.RED));
            Console.WriteLine(signal.GetEnumDescription(Signal.YELLOW));
            Console.WriteLine(signal.GetEnumDescription(Signal.BULE));
        }
    }
}