What is the ArrayList class in C#?

The ArrayList class represents an ordered collection of objects that can be individually indexed. It's basically a replacement for arrays.

The following are the methods of the Arraylist class-

4

MR.	#Methods and descriptions
1	public virtual int Add(object value); Add an object to the end of the ArrayList.
2	public virtual void AddRange(ICollection c); Add the elements of ICollection Added to the end of the ArrayList.
3	public virtual void Clear(); Remove all elements from ArrayList .
public virtual bool Contains(object item); Judge an element Whether in ArrayList.
5	public virtual ArrayList GetRange(int index, int count); Return An ArrayList that represents a subset of the elements in the source ArrayList.
6	public virtual int IndexOf(object); Return ArrayList or part of it The zero-based index of the first occurrence of a value in .
7	public virtual void Insert(int index , object value); Insert the element into the ArrayList at the specified index.
8	public virtual void InsertRange(int index, ICollection c); will The elements of the collection are inserted into the ArrayList at the specified index.
9	public virtual void Remove(object obj); Remove from ArrayList The first occurrence of a specific object.
10	public virtual void RemoveAt(int index); Delete ArrayList specified index elements at.
11	public virtual void RemoveRange(int index, int count); From ArrayList.
12	public virtual void Reverse(); Reverse ArrayList The order of the elements.
13	public virtual void SetRange(int index, ICollection c); will The elements of the collection are copied to a series of elements in the ArrayList.
14	public virtual void Sort(); Sort elements in ArrayList middle.
15	public virtual void TrimToSize(); strong> Set the capacity to ArrayList the actual number of elements.

Let us see an example of ArrayList -

To sort ArrayList in C#, use Sort() method.

The following is the ArrayList -

ArrayList arr = new ArrayList();
arr.Add(32);
arr.Add(12);
arr.Add(55);
arr.Add(8);
arr.Add(13);

Now use the Sort() method to sort the ArrayList -

arr.Sort();

You can try running the following code to sort the ArrayList in C# -

Example

Real-time demonstration

using System;
using System.Collections;

namespace Demo {
   class Program {

      static void Main(string[] args) {

         ArrayList arr = new ArrayList();

         arr.Add(89);
         arr.Add(34);
         arr.Add(77);
         arr.Add(90);

         Console.Write("List: ");
         foreach (int i in arr) {
            Console.Write(i + " ");
         }

         Console.WriteLine();
         Console.Write("Sorted List: ");
         arr.Sort();
         foreach (int i in arr) {
            Console.Write(i + " ");
         }
         Console.WriteLine();
         Console.ReadKey();
      }
   }
}

Output

List: 89 34 77 90
Sorted List: 34 77 89 90

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