Reverse the order of the elements in the entire ArrayList or in the specified range in C#

CsharpServer Side ProgrammingProgramming

To reverse the order of the elements in the entire ArrayList, the code is as follows −

Example

 Live Demo

using System;
using System.Collections;
public class Demo {
   public static void Main(String[] args) {
      ArrayList list1 = new ArrayList();
      list1.Add("A");
      list1.Add("B");
      list1.Add("C");
      list1.Add("D");
      list1.Add("E");
      list1.Add("F");
      list1.Add("G");
      list1.Add("H");
      list1.Add("I");
      Console.WriteLine("Elements in ArrayList1...");
      foreach (string res in list1) {
         Console.WriteLine(res);
      }
      ArrayList list2 = new ArrayList();
      list2.Add("A");
      list2.Add("B");
      list2.Add("C");
      list2.Add("D");
      list2.Add("E");
      list2.Add("F");
      list2.Add("G");
      list2.Add("H");
      list2.Add("I");
      Console.WriteLine("Elements in ArrayList2...");
      foreach (string res in list2) {
         Console.WriteLine(res);
      }
      ArrayList list3 = new ArrayList();
      Console.WriteLine("Current capacity of ArrayList3: " + list3.Capacity);
      list3 = list2;
      Console.WriteLine("Current capacity of ArrayList3 (Updated) " + list3.Capacity);
      Console.WriteLine("Is ArrayList3 equal to ArrayList2? = "+list3.Equals(list2));
      Console.WriteLine("Count of elements in ArrayList2 = " + list2.Count);
      list2.Reverse();
      Console.WriteLine("Elements in ArrayList2...Reversed");
      foreach (string res in list2) {
         Console.WriteLine(res);
      }
   }
}

Output

This will produce the following output −

Elements in ArrayList1...
A
B
C
D
E
F
G
H
I
Elements in ArrayList2...
A
B
C
D
E
F
G
H
I
Current capacity of ArrayList3: 0
Current capacity of ArrayList3 (Updated) 16
Is ArrayList3 equal to ArrayList2? = True
Count of elements in ArrayList2 = 9
Elements in ArrayList2...Reversed
I
H
G
F
E
D
C
B
A

Example

Let us see another example −

 Live Demo

using System;
using System.Collections;
public class Demo {
   public static void Main(String[] args) {
      ArrayList list = new ArrayList();
      list.Add("Andy");
      list.Add("Gary");
      list.Add("Katie");
      list.Add("Amy");
      Console.WriteLine("Elements in ArrayList...");
      foreach (string res in list) {
         Console.WriteLine(res);
      }
      string[] strArr = { "John", "Jacob" };
      list.AddRange(strArr);
      Console.WriteLine("Elements in ArrayList...UPDATED");
      foreach(String str in list) {
         Console.WriteLine(str);
      }
      list.Reverse(1, 3);
      Console.WriteLine("Elements in ArrayList2...Reversed 3 elements beginning from index 1");
      foreach (string res in list) {
         Console.WriteLine(res);
      }
   }
}

Output

This will produce the following output −

Elements in ArrayList...
Andy
Gary
Katie
Amy
Elements in ArrayList...UPDATED
Andy
Gary
Katie
Amy
John
Jacob
Elements in ArrayList2...Reversed 3 elements beginning from index 1
Andy
Amy
Katie
Gary
John
Jacob
raja
Published on 11-Dec-2019 07:54:22
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