C# 索引器
1 using System; 2 using System.Collections.Generic; 3 using System.Text; 4 namespace Index 5 { 6 class sample<T> //这个类告诉我们如何使用客户端代码索引器 7 { 8 private T[] arr = new T[100]; 9 public T this[int i] //索引器的签名由其形参的数量和类型组成。 10 { 11 get { return arr[i];} 12 set { arr[i] = value;} 13 } 14 } 15 class IndexerClass 16 { 17 private int[] arr = new int[100]; //定义数组 18 public int this[int index] //索引器声明 19 { 20 get 21 { 22 if (index < 0 || index >100) return 0; 23 return arr[index]; 24 } 25 set 26 { 27 if (!(index < 0 || index > 100)) arr[index] = value; 28 } 29 } 30 } 31 class String_index 32 { 33 string[] days = { "Sun", "Mon", "Tues", "Wed", "Thurs", "Fri", "Sat" }; 34 private int GetDay(string testday) 35 { 36 int i = 0; 37 foreach(string day in days) 38 { 39 if (day == testday) return i; 40 i++; 41 } 42 return -1; 43 } 44 public int this[string day] 45 { 46 get{ return GetDay(day); } 47 } 48 } 49 class Program 50 { 51 static void Main(string[] args) 52 { 53 sample<string> string_value = new sample<string>(); 54 string_value[0] = "Hello world"; 55 System.Console.WriteLine(string_value[0]); 56 57 IndexerClass test = new IndexerClass(); 58 //调用索引器初始化第2、4个数据 59 test[3] = 123; 60 test[5] = 1024; 61 for (int i = 0; i <= 10; i++ ) 62 { System.Console.WriteLine("数据为#{0} = {1}", i, test[i]);} 63 String_index week = new String_index(); 64 System.Console.WriteLine("这是一周的第{0}天", week["Tues"]); 65 Console.ReadKey(); 66 } 67 } 68 }
来源：http://blog.csdn.net/seawaywjd/article/details/7061155
