using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace Consoleapplication3{   public class BaseClass    {        /// <summary>        /// 常量        /// </summary>        public const int Number = 10;        /// <summary>        /// 屬性        /// </summary>        public int ID { get; set; }        /// <summary>        /// 字段        /// </summary>        public string Name;        /// <summary>        /// 方法        /// </summary>        /// <returns></returns>        public void SayHello()        {            Console.WriteLine("我是無返回類型的方法");        }        /// <summary>        /// 索引        /// </summary>        /// <param name="index"></param>        /// <returns></returns>        public int this[int index]        {            get            {                switch (index)                {                    case 0:                        return 0;                        break;                    case 1: return 1;                        break;                    case 2: return 2;                        break;                    case 3: return 3;                        break;                    default: return 10000;                        break;                }            }            set            {                switch (index)                {                    case 0:                        ID = value;                        break;                    case 1: ID = value;                        break;                    case 2: ID = value;                        break;                    case 3: ID = value;                        break;                    default: ID = value;                        break;                }            }        }    }}

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace ConsoleApplication3{    public class MyClass : BaseClass    {        /// <summary>        /// 常量        /// </summary>       new public const int Number = 10;        /// <summary>        /// 屬性        /// </summary>       new public int ID { get; set; }        /// <summary>        /// 字段        /// </summary>        public string Name;        /// <summary>        /// 方法        /// </summary>        /// <returns></returns>        public string SayHello()        {            string str = "hello";            return str;        }        /// <summary>        /// 索引        /// </summary>        /// <param name="index"></param>        /// <returns></returns>        public int this[int index]        {            get            {                switch (index)                {                    case 0:                        return 0;                        break;                    case 1: return 1;                        break;                    case 2: return 2;                        break;                    case 3: return 3;                        break;                    default: return 10000;                        break;                }            }            set            {                switch (index)                {                    case 0:                        ID = value;                        break;                    case 1: ID = value;                        break;                    case 2: ID = value;                        break;                    case 3: ID = value;                        break;                    default: ID = value;                        break;                }            }        }    }}