Using ArrayList in C#

Using ArrayList in C#

This example explains how to insert items into array list and fetch them based on type.

ArrayList is used for dynamic length 

Add namespace  System.Collections;

Create an Array List

ArrayList arrayList = new ArrayList();

Add items to an array list

            arrayList.Add(1);
            arrayList.Add(2);
            arrayList.Add(3);
            arrayList.Add(1.1f);
            arrayList.Add(0.5f);

            arrayList.Add("Hello");
            arrayList.Add("World!");

It has integers and float values and string values also/

Get All values from Array List

            Console.WriteLine("Display All Values in Array List");
            foreach (var item in arrayList)
            {
                Console.WriteLine(item);
            }
Output: 1       2       3       1.1     0.5 Hello World!

Get Only Integers from Array List

            Console.WriteLine("Get Only Integers");
            foreach (var item in arrayList.OfType<int>())
            {
               
                Console.Write(item+"\t");
            }

Output:1       2       3

Get Only Float values from Array List

            Console.WriteLine("Get Only float");
            foreach (var item in arrayList.OfType<float>())
            {
               
                Console.Write(item+"\t");
            }

Output:1.1 0.5

Get Only String values from Array List

            Console.WriteLine("Get Only String Values");
            foreach (var item in arrayList.OfType<string>())
            {
               
                Console.Write(item+"\t");
            }

Output:Hello World!

Tags: using ArrayList in C#,C# ArrayList,ArrayList in C#, ArrayList OfType method usage,Insert elements into Array List, Dynamic Array in C#