Microsoft Certified Solutions Developer (MCSD) Certification Practice Test 2026 - Free MCSD Practice Questions and Study Guide

The interface that facilitates the implementation of the iterator pattern in C# is IEnumerable. This interface provides a standardized way to iterate through a collection of objects. By implementing IEnumerable, a class allows its instances to be the target of a foreach loop, which is a syntactical sugar for the more manual iteration process. This interface defines the GetEnumerator method, which returns an IEnumerator that provides the mechanism to navigate through the collection.

When a class implements IEnumerable, it must also implement GetEnumerator, which will return an enumerator that allows clients to iterate through the collection. The enumerator typically provides the functionality to reset the iteration, move to the next element, and access the current element in the collection.

This is crucial for developers looking to create collections that can be traversed in a simple and intuitive manner, adhering to a common pattern that enhances code readability and maintainability.