ArrayList:-
Array lists are not strongly type collection. It will store values of different datatypes or same datatype. Array list size will increase or decrease dynamically it can take any size of values from any data type. These Array lists will be accessible with “System.Collections” namespaceArrayList is one of the most flexible data structure from CSharp Collections. ArrayList contains a simple list of values. ArrayList implements the IList interface using an array and very easily we can add , insert , delete , view etc. It is very flexible because we can add without any size information , that is it will grow dynamically and also shrink .
Operations On ArrayList:-
Add :
Add method we use to append Items at the end of an ArrayList
Insert :
Insert method we use Add Item in a specified position in an ArrayList
Remove :
Remove method we use to Item from ArrayList by specifying Item's name
RemoveAt:
RemoveAt method we use to remove an item from a specified position
Sort :
To Sort Items in an ArrayList
Note :- All operation are operate on the Object of ArrayList
Source code Example
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Globalization;
using System.Collections;
Namespace ConsoleDemoApp
{
class Test
{
/* program to implement ArrayList in c# */
public static void Main(string[]
args)
{
int inputNum=0;
Console.Write("\nEnter
number of students to be add: ");
inputNum= int.Parse(Console.ReadLine());
ArrList arList = new
ArrList();
arList.ArrListOperations(inputNum);
Console.ReadKey();
}
}
Public class ArrList
{
public void
ArrListOperations(int inputNum)
{
ArrayList ItemList = new
ArrayList();
for (int i=1;
i<=inputNum; i++)
{
ItemList.Add("Item"+i);
}
// print
Console.Write("\nEntered
Items are: \n");
for (int j = 0; j
<= ItemList.Count-1; j++)
{
Console.Write(ItemList[j].ToString());
Console.Write("\n");
}
//insert an item
ItemList.Insert(3, "Item6");
Console.Write("\nAfter
inserting an item Item6 at 3 index: \n");
for (int j = 0; j
<= ItemList.Count - 1; j++)
{
Console.Write(ItemList[j].ToString());
Console.Write("\n");
}
//sort itemms in an arraylist
ItemList.Sort();
Console.Write("\nAfter
shorting ArrryList: \n");
for (int j = 0; j
<= ItemList.Count - 1; j++)
{
Console.Write(ItemList[j].ToString());
Console.Write("\n");
}
//remove an item
ItemList.Remove("Item1");
Console.Write("\nAfter
Removing item Item1: \n");
for (int j = 0; j
<= ItemList.Count - 1; j++)
{
Console.Write(ItemList[j].ToString());
Console.Write("\n");
}
//remove item from a specified index
ItemList.RemoveAt(3);
// final ArrayList
Console.Write("\n
After Removing item at index 3, items are: \n");
for (int j = 0; j
<= ItemList.Count-1; j++)
{
Console.Write(ItemList[j].ToString());
Console.Write("\n");
}
}
}
}
