List generic collection in C Sharp (C#) - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a List<T> in C#?

A List<T> is a generic collection in C# that stores elements of the same type in a dynamic array. It can grow or shrink as needed.

beginner

How do you add an item to a List<T>?

Use the Add() method. For example: myList.Add(item); adds item to the end of the list.

beginner

How do you access an element at a specific position in a List<T>?

Use the indexer with square brackets. For example: myList[0] accesses the first element.

intermediate

What happens if you try to access an index outside the List<T> range?

An ArgumentOutOfRangeException is thrown because the index is invalid.

beginner

How can you find the number of elements in a List<T>?

Use the Count property. For example: int size = myList.Count;

Which method adds an element to a List<T>?

A Remove()

B Add()

C Insert()

D Clear()

The Add() method appends an element to the end of the List<T>.

How do you get the number of elements in a List<T>?

A Length

B Size

C Capacity

D Count

The Count property returns the number of elements currently in the List<T>.

What type of collection is List<T>?

A Linked list

B Fixed-size array

C Generic dynamic array

D Dictionary

List<T> is a generic collection that uses a dynamic array internally.

What happens if you access myList[10] when myList has 5 elements?

A Throws ArgumentOutOfRangeException

B Returns default value

C Returns null

D Returns last element

Accessing an index outside the valid range throws an ArgumentOutOfRangeException.

Which of these methods removes all elements from a List<T>?

A Clear()

B Remove()

C Delete()

D Drop()

The Clear() method removes all elements from the List<T>.

Explain what a List<T> is and how it differs from a regular array.

Think about flexibility and type safety.

Describe how to add, access, and count elements in a List<T>.

Focus on common operations with List&lt;T&gt;.