internal sealed class AboutEnum
    {
        static void Main(string[] args)
        {
            Console.WriteLine("---GetUnderlyingType方法---");
            Console.WriteLine(Enum.GetUnderlyingType(typeof(EColor)));
            EColor c1 = new EColor();
            c1 = EColor.Red;
            Console.WriteLine("---ToString方法---");
            Console.WriteLine(c1.ToString());
            Console.WriteLine("---GetValues方法---");
            EColor[] colors = (EColor[])Enum.GetValues(typeof(EColor));
            foreach (EColor cc in colors)
            {
                Console.WriteLine(cc);
            }
            Console.WriteLine("---GetValues方法---");
            Console.WriteLine(Enum.GetName(typeof(EColor),2));
            Console.WriteLine("---GetNames方法---");
            String[] str = (String[])Enum.GetNames(typeof(EColor));
            foreach (string s in str)
            {
                Console.WriteLine(s);
            }
            Console.WriteLine("---Parse方法---");
            EColor c2 = (EColor)Enum.Parse(typeof(EColor), "1", true);
            Console.WriteLine(c2);
            Console.WriteLine("---IsDefined方法---");
            SetColor((EColor)1);
            // SetColor((EColor)10); //引用异常
            Console.ReadLine();
        }
        public static void SetColor(EColor c)
        {
            if (!Enum.IsDefined(typeof(EColor), c))
            {
                throw (new ArgumentOutOfRangeException("c", c, "不合法的Color value"));
            }
            else
                Console.WriteLine(Enum.GetName(typeof(EColor), c));
        }
    }
    //EColor和调用它的类型AboutEnum处于同级    
    public enum EColor {
        Write,
            Red,
            Blue,
            Yello
        }