显示(explicit )与隐式(implicit)转换操作符

    class Program
    {
        static void Main(string[] args)
        {
            /*
             * 不管是显示还是隐式转换,一种类型都只能出现一次
             */

            Console.WriteLine("************************隐式转换************************");

            Parent p = new Parent("wjire", 123);
            string name = p;
            int id = p;
            Console.WriteLine(name);//wjire
            Console.WriteLine(id);//123

            Console.WriteLine("************************显示转换************************");

            double d = (double)p;
            Parent pp = (Parent)999;
            Console.WriteLine(d);//135.3
            Console.WriteLine(pp.Id + ":" + pp.Name);//999:refuge
            Console.ReadKey();
        }
    }

    class Parent
    {
        public string Name { get; set; }

        public int Id { get; set; }

        public Parent(string name, int id)
        {
            this.Name = name;
            this.Id = id;
        }

        public static implicit operator string(Parent p)
        {
            return p.Name;
        }

        public static implicit operator int(Parent p)
        {
            return p.Id;
        }

        public static explicit operator Parent(int id)
        {
            return new Parent("refuge", id);
        }

        public static explicit operator double(Parent p)
        {
            return p.Id * 1.1;
        }
    }