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// Change first person with indexer.

myPeople[0] = new Person("Maggie", "Simpson", 2);

// Now obtain and display each item using indexer.

for (int i = 0; i < myPeople.Count; i++)

{

Console.WriteLine("Person number: {0}", i);

Console.WriteLine("Name: {0} {1}", myPeople[i].FirstName,

myPeople[i].LastName);

Console.WriteLine("Age: {0}", myPeople[i].Age);

Console.WriteLine();

}

}

■

Source Code

The SimpleIndexer project is located under the Chapter 12 subdirectory.

Indexing Objects Using String Values

The current PeopleCollection type defined an indexer that allowed the caller to identify subitems

using a numerical value. Understand, however, that this is not a requirement of an indexer method.

Assume you would rather contain the Person objects using a System.Collections.Generic.

Dictionary rather than an ArrayList. Given that ListDictionary types allow access

to the contained types using a string token (such as a person’s first name), you could define an

indexer as follows:

public class PeopleCollection : IEnumerable

{

private Dictionary listPeople =

new Dictionary();