Topic K - Looping and Collections

Overview

This topic provides further examples of looping logic, but involves the use of collections. All of these samples make use of the List<T> class to maintain a collection or group of objects.

The List<T> class is a Generic class, meaning that the item in the angled brackets - <T> - is a placeholder for the name of the actual class that is being managed in the List. For example, to have a list of Integers we would declare that as List<int>. Likewise, if we wanted a list of Student objects, it would be declared as List<Student>.

The List<T> class supports a number of methods and properties for working with the collection.

• Add() – Used to add an item to the collection
• [index] – Used to retrieve an item in the collection
• Remove() – Used to remove an item from the collection
• Count – Identifies the number of items in the collection

LOGs

OOP Basics

• Define the term Generics as used in C# and give an example

General Programming Concepts and Terms

• Describe what is meant by a “collection” class and give an example
• List and describe the common methods of collection classes such as the List<T>
• Identify the parts of the foreach statement
• Describe the common situations in which the foreach statement is typically used
• Identify the major benefit of using Generics
• List the major benefits of using collections instead of arrays