Working With List<> and Operations Performed in List<>

Introduction

The List<> type in the C# language resizes dynamically. Lists are generics and constructed types. We need to use < and > in the List declaration. The List class has many methods and properties. The namespace that we use for the list is System.Collection.Generic. The following steps are used for working with a List.

Step 1: First, open Visual Studio and click on file->new->project and click on the console application.

Step 2: Write the following namespace in the program.

using System.Collections.Generic;

Step 3: Add the following code in your program.

namespace ConsoleApplication3

{

    class Program

    {

        static void Main(string[] args)

        {

            //creation of the list

            List<string> courses = new List<string>();

            // capacity is used to Gets or sets the total number of elements the internal data structure can hold without resizing.

            Console.WriteLine("capacity of courses {0}", courses.Capacity);

            //ADD mathod is usd to add the items in the list.

            courses.Add("MCA");

            courses.Add("BCA");

            courses.Add("MBA");

            courses.Add("BBA");

            courses.Add("MTech");

            courses.Add("BTech");

            courses.Add("Bcom");

            courses.Add("Mcom");

            courses.Add("BSc");

            courses.Add("MSc");

            courses.Add("Diploma");

            //display the items

            foreach (string i in courses)

            {

                Console.WriteLine(i);

            }

            Console.WriteLine("After adding the items the capacity of courses is {0}", courses.Capacity);

            //count property of list is used to find the total number of elements in the list

            Console.WriteLine("The total number of elements presents in the list is:{0}", courses.Count);

            //Remove an item from the list

            courses.Remove("MTech");

            //After remove an item display the list

            Console.WriteLine("Remove the item MTech in the list:");

            foreach (string i in courses)

            {

                Console.WriteLine(i);

            }

            //Remove an item at the specified index location

            courses.RemoveAt(3);

            //After remove an item display the list

            Console.WriteLine("Remove the item from the index location 3 from the list");

            foreach (string i in courses)

            {

                Console.WriteLine(i);

            }

            //  Find whether the item contain in the list or not

            courses.Contains("MCA");

            Console.WriteLine("Item contained:"+courses.Contains("MCA"));//It gives the output in true/false format

        }

    }

}

Step 4 : Now run the program by pressing F5 and the output is as:

Summary: In this article I create the List named courses, add, remove and find items; also use the capacity and count property of the list.