C#运算符重载

namespace 重载运算符
{
    class Box
    {
        public int length { get; set;}
        public int breadth { get; set;}
        public int height { get; set; }

        /// <summary>
        /// 运算符的重载
        /// </summary>
        /// <param name="box1"></param>
        /// <param name="box2"></param>
        /// <returns></returns>
        public static Box operator + (Box box1,Box box2) {
            Box box = new Box();
            box.length = box1.length + box2.length;
            box.breadth = box1.breadth + box2.breadth;
            box.height = box1.height + box2.height;
            return box;
        }

        public override string ToString()
        {
            return String.Format("长：{0},宽：{1}，高：{2}",length,breadth,height);
        }
    }

  class Program
    {
        static void Main(string[] args)
        {
            Box box1 = new Box();
            box1.height = 5;
            box1.length = 4;
            box1.breadth = 3;
            Box box2 = new Box();
            box2.height = 2;
            box2.length = 3;
            box2.breadth = 2;
            Console.WriteLine(box1+box2);
            Console.ReadKey();
        }
    }
}

长：7，宽：5，高：7