Skip to content

Courses
Tutorials
Practice
Contests

C# Data Types
C# Decision Making
C# Methods
C# Delegates
C# Constructors
C# Arrays
C# ArrayList
C# String
C# Tuple
C# Indexers
C# Interface
C# Multithreading
C# Exception

C# | Insert an element into the ArrayList at the specified index

C# | ArrayList whose elements are copies of the specified value

Last Updated : 01 Feb, 2019

Comments

Improve

Suggest changes

Like Article

Like

Report

ArrayList.Repeat(Object, Int32) Method is used to return an ArrayList whose elements are copies of the specified value. Or in other words, this method is used when you want to repeat a specified element in the ArrayList. This method is an O(n) operation, where n is the number of times item should be copied. Syntax:

public static ArrayList Repeat (object item, int count);

Parameters:

item: It is an Object to copy multiple times in the new ArrayList. The value can be null. count: It counts the number of times item should be copied.

Return Value: This method returns an ArrayList with a count number of elements, all of which are copies of the item. Exception: If the value of count is less than zero then this method will give ArgumentOutOfRangeException. Below given are some examples to understand the implementation in a better way: Example 1:

CSharp

// C# program to illustrate the use of  // ArrayList.Repeat(Object, Int32) Method using System; using System.Collections;  class GFG {      // Main method     public static void Main()     {          // Create and repeat the element         // of ArrayList "mylist"          ArrayList mylist = ArrayList.Repeat("GFG", 6);          // Display element         foreach(Object ob in mylist)         {             Console.WriteLine(ob);         }                  // Display and count the total number of element         Console.WriteLine("The count of the item is : {0}", mylist.Count);     } }

Output:

  GFG  GFG  GFG  GFG  GFG  GFG  The count of the item is : 6

Example 2:

CSharp

// C# program to illustrate the use of  // ArrayList.Repeat(Object, Int32) Method using System; using System.Collections;  class GFG {      // Main method     public static void Main()     {          // Create and repeat the          // element of mylist ArrayList         // this will give runtime error         // as count is less than 0         ArrayList mylist = ArrayList.Repeat(43, -1);          // Display element         foreach(Object ob in mylist)         {             Console.WriteLine(ob);         }                  // Display and count the total number of element         Console.WriteLine("The count of the item is : {0}", mylist.Count);     } }

Runtime Error:

Unhandled Exception: System.ArgumentOutOfRangeException: Non-negative number required. Parameter name: count

Reference:

https://docs.microsoft.com/en-us/dotnet/api/system.collections.arraylist.repeat?view=netframework-4.7.2

C# | Insert an element into the ArrayList at the specified index

ankita_saini

Improve

Article Tags :

C#
CSharp-method
CSharp-Collections-Namespace
CSharp-Collections-ArrayList

Similar Reads

C# | Insert an element into the ArrayList at the specified index

ArrayList represents an ordered collection of an object that can be indexed individually. It is basically an alternative to an array. It also allows dynamic memory allocation, adding, searching and sorting items in the list. ArrayList.Insert(Int32, Object) method inserts an element into the ArrayLis

C# | Copying the elements of ArrayList to a new array

ArrayList.ToArray Method is used to copy the elements of the ArrayList to a new array. This method contains two methods in its overload list as follows: ToArray()ToArray(Type)ToArray() This method is used to copy the elements of the ArrayList to a new Object array. The elements are copied using Arra

C# | Remove a range of elements from the ArrayList

ArrayList represents an ordered collection of an object that can be indexed individually. It is basically an alternative to an array. It also allows dynamic memory allocation, adding, searching and sorting items in the list. ArrayList.RemoveRange(Int32, Int32) method is used to remove a range of ele

C# | Copy the elements of collection over a range of elements in ArrayList

ArrayList.SetRange(Int32, ICollection) Method is used to copy the elements of a collection over a range of elements in the ArrayList. Syntax: public virtual void SetRange (int index, System.Collections.ICollection c); Parameters: index: It is a zero-based ArrayList index at which to start copying th

C# | Remove all elements from the ArrayList

ArrayList represents an ordered collection of an object that can be indexed individually. It is basically an alternative to an array. It also allows dynamic memory allocation, adding, searching and sorting items in the list. ArrayList.Clear method is used to remove all the elements from the ArrayLis

C# | Get the number of elements actually contained in the ArrayList

ArrayList represents an ordered collection of an object that can be indexed individually. It is basically an alternative to an array. It also allows dynamic memory allocation, adding, searching and sorting items in the list. ArrayList.Count property gets the number of elements actually contained in

C# | Get or set the number of elements that the ArrayList can contain

ArrayList represents an ordered collection of an object that can be indexed individually. It is basically an alternative to an array. It also allows dynamic memory allocation, adding, searching and sorting items in the list. ArrayList.Capacity property is used to get or set the number of elements th

C# | How to copy the entire ArrayList to a one-dimensional Array

ArrayList.CopyTo Method is used to copy the entire ArrayList to a compatible one-dimensional Array, starting at the beginning of the target array. Syntax: public virtual void CopyTo (Array array); Here, array is the one-dimensional Array which is the destination of the elements copied from ArrayList

C# | Getting a subset of the elements from the source ArrayList

ArrayList.GetRange(Int32, Int32) Method is used to get an ArrayList which will represent a subset of the elements in the source ArrayList. Syntax: public virtual System.Collections.ArrayList GetRange (int index, int count); Parameters: index: It is of Int32 type and represents the zero-based ArrayLi

C# | Copying the Hashtable elements to an Array Instance

Hashtable.CopyTo(Array, Int32) Method is used to copy the elements of a Hashtable to a one-dimensional Array instance at the specified index.Syntax: public virtual void CopyTo (Array array, int arrayIndex); Parameters: array : The one-dimensional Array that is the destination of the DictionaryEntry

Corporate & Communications Address:

A-143, 7th Floor, Sovereign Corporate Tower, Sector- 136, Noida, Uttar Pradesh (201305)

Registered Address:

K 061, Tower K, Gulshan Vivante Apartment, Sector 137, Noida, Gautam Buddh Nagar, Uttar Pradesh, 201305

Advertise with us

Company
About Us
Legal
Privacy Policy
In Media
Contact Us
Advertise with us
GFG Corporate Solution
Placement Training Program

Languages
Python
Java
C++
PHP
GoLang
SQL
R Language
Android Tutorial
Tutorials Archive

DSA
Data Structures
Algorithms
DSA for Beginners
Basic DSA Problems
DSA Roadmap
Top 100 DSA Interview Problems
DSA Roadmap by Sandeep Jain
All Cheat Sheets

Data Science & ML
Data Science With Python
Data Science For Beginner
Machine Learning
ML Maths
Data Visualisation
Pandas
NumPy
NLP
Deep Learning

Web Technologies
HTML
CSS
JavaScript
TypeScript
ReactJS
NextJS
Bootstrap
Web Design

Python Tutorial
Python Programming Examples
Python Projects
Python Tkinter
Python Web Scraping
OpenCV Tutorial
Python Interview Question
Django

Computer Science
Operating Systems
Computer Network
Database Management System
Software Engineering
Digital Logic Design
Engineering Maths
Software Development
Software Testing

DevOps
Git
Linux
AWS
Docker
Kubernetes
Azure
GCP
DevOps Roadmap

System Design
High Level Design
Low Level Design
UML Diagrams
Interview Guide
Design Patterns
OOAD
System Design Bootcamp
Interview Questions

Inteview Preparation
Competitive Programming
Top DS or Algo for CP
Company-Wise Recruitment Process
Company-Wise Preparation
Aptitude Preparation
Puzzles

School Subjects
Mathematics
Physics
Chemistry
Biology
Social Science
English Grammar
Commerce
World GK

GeeksforGeeks Videos
DSA
Python
Java
C++
Web Development
Data Science
CS Subjects

@GeeksforGeeks, Sanchhaya Education Private Limited, All rights reserved

We use cookies to ensure you have the best browsing experience on our website. By using our site, you acknowledge that you have read and understood our Cookie Policy & Privacy Policy

Improvement

Suggest Changes

Help us improve. Share your suggestions to enhance the article. Contribute your expertise and make a difference in the GeeksforGeeks portal.

geeksforgeeks-suggest-icon

Create Improvement

Enhance the article with your expertise. Contribute to the GeeksforGeeks community and help create better learning resources for all.

geeksforgeeks-improvement-icon

Suggest Changes

min 4 words, max Words Limit:1000

Thank You!

Your suggestions are valuable to us.

What kind of Experience do you want to share?

Interview Experiences

Admission Experiences

Career Journeys

Work Experiences

Campus Experiences

Competitive Exam Experiences