Question

How to use array list (ArrayList) in C#

Answer 1

using System;
using System.Collections;
 
class Program
{
    static void Main() {
        ArrayList al = new ArrayList();
        
        al.Add("c#");
        al.Add("c");
        al.Add("java");
        al.Add("php");
        al.Add("python");

        foreach (object item in al) {
           Console.WriteLine(item);
        }
    }
}
 
 
/*
run:
 
c#
c
java
php
python
 
*/

 

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Answer 2

using System;
using System.Collections;
 
class Program
{
    static void Main() {
        ArrayList al = new ArrayList();
        
        al.Add("c#");
        al.Add("c");
        al.Add("java");
        al.Add("php");
        al.Add("python");

        foreach (object item in al) {
           Console.WriteLine(item);
        }
        
        Console.WriteLine("\n");
        
        al.Insert(0, "c++");
        al.Insert(3, "vb.net");
        
        foreach (object item in al) {
           Console.WriteLine(item);
        }
    }
}

 
 
/*
run:
 
c#
c
java
php
python


c++
c#
c
vb.net
java
php
python
 
*/

 

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Answer 3

using System;
using System.Collections;
 
class Program
{
    static void Main() {
        ArrayList al = new ArrayList();
        
        al.Add("c#");
        al.Add("c");
        al.Add("java");
        al.Add("php");
        al.Add("python");

        foreach (object item in al) {
          Console.WriteLine(item);
        }
        
        Console.WriteLine("\n");
        
        al.Remove("java");
        
        foreach (object item in al) {
          Console.WriteLine(item);
        }
    }
}

 
 
/*
run:
 
c#
c
java
php
python


c#
c
php
python
 
*/

 

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Answer 4

using System;
using System.Collections;
 
class Program
{
    static void Main() {
        ArrayList al = new ArrayList();
        
        al.Add("c#");
        al.Add("c");
        al.Add("java");
        al.Add("php");
        al.Add("python");

        foreach (object item in al) {
          Console.WriteLine(item);
        }
        
        Console.WriteLine("\n");
        
        al.RemoveAt(2);
        
        foreach (object item in al) {
          Console.WriteLine(item);
        }
    }
}

 
 
/*
run:
 
c#
c
java
php
python


c#
c
php
python
 
*/

 

70+ SQL courses for beginners and professionals

Answer 5

using System;
using System.Collections;
 
class Program
{
    static void Main() {
        ArrayList al = new ArrayList();
        
        al.Add("c#");
        al.Add("c");
        al.Add("java");
        al.Add("php");
        al.Add("python");

        foreach (object item in al) {
          Console.WriteLine(item);
        }
        
        Console.WriteLine("\n");
        
        al.RemoveRange(1, 3);
        
        foreach (object item in al) {
          Console.WriteLine(item);
        }
    }
}

 
 
/*
run:
 
c#
c
java
php
python


c#
python
 
*/

 

70+ SQL courses for beginners and professionals

Answer 6

using System;
using System.Collections;
 
class Program
{
    static void Main() {
        ArrayList al = new ArrayList();
        
        al.Add("c#");
        al.Add("c");
        al.Add("php");
        al.Add("java");
        al.Add("python");

        foreach (object item in al) {
          Console.WriteLine(item);
        }
        
        Console.WriteLine("\n");
        
        al.Sort();
        
        foreach (object item in al) {
          Console.WriteLine(item);
        }
    }
}

 
 
/*
run:
 
c#
c
php
java
python


c
c#
java
php
python
 
*/

 

70+ SQL courses for beginners and professionals

Answer 7

using System;
using System.Collections;
  
class Program
{
    static void Main() {
        ArrayList al =  new ArrayList{"c#", "c", "php", "java", "python", "vb.net"};

        Console.WriteLine(al.Count);
    }
}
 
  
  
/*
run:
  
6
  
*/

 

70+ SQL courses for beginners and professionals