C#中的枚举Enum

namespace EnumTest
{
    enum TrafficLight
    { 
        Red,
        Yellow,
        Green
    }
    class EnumTest
    {
        static void Main(string[] args)
        {
            TrafficLight light1;
            TrafficLight light2;

            light1 = TrafficLight.Green;
            light2 = (TrafficLight)100;

            // error
            // light2 = 100;

            Console.WriteLine(light1);
            Console.WriteLine(light2);
        }
    }
}

OUTPUT:

Traffic light1 isGreen
Traffic light2 is100

注意：

枚举无非是包着外皮的整数值。整数类型可以被派给任何所喜欢的枚举类型。如：(TrafficLight)4。