位枚举

    [Flags]
    enum Styles
    {
        white=1,
        yellow=2,
        grean=4,
        blue=8,
        gray=16,
        orange=32,
        pink=64,
        red=128,
        black=256
    }

var style = Styles.white | Styles.yellow | Styles.grean;//组合枚举
            Console.WriteLine(style.ToString());//white,yellow,grean
            Console.WriteLine(((Styles)7).ToString());//white,yellow,grean
            Console.WriteLine((style & Styles.white) != 0?"true":"false");//是否包含指定枚举，true
            //从组合中删除元素，第一种
            if ((style & Styles.white) != 0)
            {
                Console.WriteLine(style ^ Styles.white);//yellow,grean
            }
            //从组合中删除元素，第二种
            Console.WriteLine(style & (~Styles.white));