What is the purpose of ArrayList in .NET?

ArrayList is used to store elements of different data types.




Advantage of ArrayList is that its size can grow or shrink dynamically. Here is an example using an ArrayList to store and read list of integers and list of strings:

public class sampleClass {
public static void displayList(ArrayList sampleList) {
foreach(var element in sampleList) {
Console.Write(“ “ + element);
}
}
public static void Main() {
ArrayList intList = new ArrayList();
intList.Add(10);
intList.Add(20);
Console.WriteLine(“Elements of integer list are:”);
displayList(intList);
ArrayList stringList = new ArrayList();
stringList.Add(“Hello!”);
stringList.Add(“Have a Nice Day!”);
Console.WriteLine(“Elements of string list are:”);
displayList(stringList);
}
}

Output of this code will be:

Elements of integer list are: 10 20
Elements of string list are: Hello! Have a Nice Day!

ArrayList has many methods like Clear(), AddRange(<list>), RemoveAt(<index>), Insert(<position, element>) and properties like count. You can use them to manipulate on ArrayList elements.

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