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// Indexers allow you to access items in an array-like fashion.

class Program

{

static void Main(string[] args)

{

Console.WriteLine("***** Fun with Indexers *****\n");

PeopleCollection myPeople = new PeopleCollection();

// Add objects with indexer syntax.

myPeople[0] = new Person("Homer", "Simpson", 40);

myPeople[1] = new Person("Marge", "Simpson", 38);

myPeople[2] = new Person("Lisa", "Simpson", 9);

myPeople[3] = new Person("Bart", "Simpson", 7);

myPeople[4] = 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();

}

}

}

As you can see, indexers behave much like a custom collection supporting the IEnumerator and

IEnumerable interfaces in that they provide access to a container’s subitems. The major difference

of course is that rather than accessing the contents using the foreach construct, you are able to

manipulate the internal collection of sub-objects just like a standard array.

Now for the big question: How do you configure the PeopleCollection class (or any class/

structure) to support this functionality? An indexer is represented as a slightly mangled C# property.

In its simplest form, an indexer is created using the this[] syntax. Here is the required update for

the PeopleCollection class: