索引器

1. 类似与数组取值，数组赋值
2. 索引器都可以用函数代替
3. 方便阅读

使用例子

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

namespace _14_索引器
{
    internal class Test
    {
        private string[] name = new string[10];
        public string this[int index]
        {
            get
            {
                return name[index];
            }
            set
            {
                name[index] = value;
            }
        }
    }
}

在Test类内定义字符串数组，定义索引器

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

namespace _14_索引器
{
    internal class Week
    {
        private string[] days = { "Mon", "Tues", "Wed", "Thurs", "Fri", "Sat", "Sun" };

        public int GetDay(string day)
        {
            int i = 0;
            foreach(string temp in days)
            {
                if (temp == day) return i+1;
                i++;
            }
            return -1;

        }
        public int this[string day]
        {
            get
            {
                return GetDay(day);
            }
        }
    }
}

测试

using System;
namespace _14_索引器
{
    internal class Program
    {
        static void Main(string[] args)
        {
            //数组索引
            int[] array = { 34, 67, 432, 4, 32 };
            Console.WriteLine(array[1]);
            //例子1
            Test test = new Test();
            test[0] = "张三";
            test[1] = "李四";

            Console.WriteLine(test[0]);
            Console.WriteLine(test[1]);

            //索引器具体例子，
            Week week = new Week();
            Console.WriteLine(week.GetDay("Thurs"));
            Console.WriteLine(week["Thurs"]);
        }
    }
}