索引器：Both Indexer and Switch have two types

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace PTest
{
    class Program
    {
        class WeatherOfWeek
        {
            public string this[int Index]
            {
                get
                {
                    switch (Index)
                    {
                        case 0:
                            {
                                return "Today is cloudy!";
                            }
                        case 5:
                            {
                                return "Today is thundershower!";
                            }
                        default:
                            {
                                return "Today is fine!";
                            }
                    }
                }
            }
            public string this[string Day]
            {
                get
                {
                    string TodayWeather = null;
                    switch (Day)
                    {
                        case "Sunday":
                            {
                                TodayWeather = "Today is cloudy!";
                                break;
                            }
                        case "Friday":
                            {
                                TodayWeather = "Today is thundershower!";
                                break;
                            }
                        default:
                            {
                                TodayWeather = "Today is fine!";
                                break;
                            }
                    }
                    return TodayWeather;
                }
            }
        }

 

        static void Main(string[] args)
        {
            string[] Week = new string[] { "Sunday", "Monday", "Tuesday",
"Wednesday", "Thursday", "Friday", "Staurday"};
            WeatherOfWeek tmpWeatherOfWeek = new WeatherOfWeek();
            for (int i = 0; i < 7; i++)
            {
                Console.WriteLine(tmpWeatherOfWeek[i]);
            }
            foreach (string tmpDay in Week)
            {
                Console.WriteLine(tmpWeatherOfWeek[tmpDay]);
            }
            Console.ReadKey();
        }
    }
}