Enumerators and Iterators - Illustrated C# 2005 - page 463

The IEnumerable Interface
The IEnumerable interface has only a single member, method GetEnumerator , which returns an
enumerator for the object.
Figure 20-4 shows class MyClass , which has three items to enumerate, and implements the
IEnumerable interface by implementing the GetEnumerator method.
Figure 20-4. The GetEnumerator method returns an enumerator object for the class.
The following code shows the form for the declaration of an enumerable class.
using System.Collections;
Implements the IEnumerable interface
↓
class MyClass : IEnumerable
{
public IEnumerator GetEnumerator { ... }
... ↑
} Returns an object of type IEnumerator
The following code gives an example of an enumerable class that uses enumerator class
ColorEnumerator from the previous example. Remember that ColorEnumerator derives from
IEnumerator .
using System.Collections;
class MyColors: IEnumerable
{
string[] Colors = { "Red", "Yellow", "Blue" };
public IEnumerator GetEnumerator()
{
return new ColorEnumerator(Colors) ;
} ↑
}