Enum用类来实现

using UnityEngine;
using System.Collections;
using DB = UnityEngine.Debug;

public class EnumAndClass : MonoBehaviour 
{

	// Use this for initialization
	void Start ()
	{
        DB.Log(Week.Monday);
	}


    private sealed class Week
    {
		public static readonly Week Monday = new Week (0);
		public static readonly Week Tuesday = new Week (1);
		public static readonly Week Wednesday = new Week (2);
		public static readonly Week Thurday = new Week (3);
		public static readonly Week Friday = new Week (4);
		public static readonly Week Saturday = new Week (5);
		public static readonly Week Sunday = new Week (6);

        private int _infoType;
        private Week(int infoType)
        {
            _infoType = infoType;
        }

        public override string ToString()
        {
            switch(_infoType)
            {
	        case 0:
				return "星期一";
			case 1:
				return "星期二";
			case 2:
				return "星期三";
			case 3:
				return "星期四";
			case 4:
				return "星期五";
			case 5:
				return "星期六";
			case 6:
				return "星期日";
                default:
                    throw new System.Exception("不正确的星期信息");
            }
        }
    }
}