public  class Bird

    {

        int xdata;

        /// <summary>

        /// 属性的简洁写法，等同于下面的xData方式

        /// </summary>

        public int Data { set; get; }

        /// <summary>

        /// 属性的正常写法

        /// </summary>

        public int xData

        {

            set { xdata = value; }

            get { return xdata; }

        }

        /// <summary>

        /// 属性的递归

        /// </summary>

        public int Type

        {

            set

            {

                if (value < )

                {

                    Type = value + ; //这里会递归调用set

                    Console.WriteLine("value={0}", value);

                }

            }

        }

    }

    class Program

    {

        static void Main(string[] args)

        {

            Bird bd = new Bird();

            bd.Data = ;

            Console.WriteLine("data = {0}", bd.Data);

            bd.Type = ;

        }

    }