CSharp_Prog_Guide

Пример 2 Описание

В этом примере объявляется класс, в котором хранятся дни недели. Объявляется метод доступа get, который принимает строку (название дня недели) и возвращает соответствующее целое число. Например, воскресенье возвращает 0, понедельник возвращает 1 и т. д.

Код

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class Program

{

static void Main(string[] args)

{

DayCollection week = new DayCollection();

System.Console.WriteLine(week["Fri"]);

System.Console.WriteLine(week["Made-up Day"]);

}

Output

5

-1

Robust Programming

There are two main ways in which the security and reliability of indexers can be improved:

Be sure to incorporate some type of error-handling strategy to handle the chance of client code passing in an invalid index value. In the first example earlier in this topic, the TempRecord class provides a Length property that enables the client code to verify the input before passing it to the indexer. You can also put the error handling code inside the indexer itself. Be sure to document for users any exceptions that you throw inside an indexer accessor.
Set the accessibility of the get and set accessors to be as restrictive as is reasonable. This is important for the set accessor in particular.

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Содержание