打開.Net Framework源代碼隨便看幾個類，就會發現索引器的影子。索引器可以被重載，可以接收一個或者多個參數，但是不可以定義為靜態的。可以用關聯數組的方式訪問索引器。

public class Fruit

{

??????? string peach = "a round juicy fruit that has a soft yellow or red skin and a large hard seed in the center, or the tree that this fruit grows on";

??????? string orange = "a round fruit that has a thick orange skin and is divided into parts inside";

??????? string banana = "a long curved tropical fruit with a yellow skin";

??????? string apple = "a hard round fruit that has red, light green, or yellow skin and is white inside ";

??????? public string this[string fruitName]

??????? {

??????????? get

??????????? {

??????????????? switch (fruitName)

??????????????? {

??????????????????? case "peach":

??????????????????????? return peach;

??????????????????? case "orange":

??????????????????????? return orange;

??????????????????? case "banana":

??????????????????????? return banana;

??????????????????? case "apple":

??????????????????????? return apple;

??????????????????? default:

??????????????????????? throw new Exception("wrong fruit name");

??????????????? }

??????????? }

??????????? set

??????????? {

??????????????? switch (fruitName)

??????????????? {

??????????????????? case "peach":

??????????????????????? peach = value;

??????????????????????? break;

??????????????????? case "orange":

??????????????????????? orange = value;

??????????????????????? break;

??????????????????? case "banana":

??????????????????????? banana = value;

???? ???????????????????break;

??????????????????? case "apple":

??????????????????????? apple = value;

??????????????????????? break;

??????????????????? default:

??????????????????????? throw new Exception("wrong fruit name");

??????????????? }

??????????? }

??????? }

??? }

?? ?class Program

??? {

??????? static void Main(string[] args)

??????? {

??????????? Fruit f = new Fruit();

??????????? //關聯數組的方式訪問get方法

??????????? Console.WriteLine(f["peach"]);

??????????? //關聯數組的方式訪問set方法

??????????? f["peach"] = "I like to eat peach.";

??????????? Console.WriteLine(f["peach"]);

??????????? Console.ReadLine();

??????? }

??? }

執行結果：

轉載于:https://www.cnblogs.com/qiuwuyu/archive/2011/08/15/2138650.html

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