Using List<> in C#

Both the List<T> and ArrayList classes have properties very similar to C# arrays. One key advantage of these classes over arrays is that they can grow and shrink as the number of stored objects changes.

The List<T> class is contained with the System.Collections.Generic namespace whilst the ArrayList class is contained within theSystem.Collections namespace.

The syntax for creating a List<T> collection is as follows:

List<type> name = new List<type>();

Step1: Make a new project. Select console application. named the project ListNamed.

Step2: Make a class Person.cs

Type the code

public class Person

    {

        public int age;

        public string name;

        public Person(int age, string name)

        {

            this.age = age;

            this.name = name;

        }

    }

Step3:In Program.cs file type the code like this…

List<Person> people = new List<Person>();

            people.Add(new Person(50, "Ahmed"));

            people.Add(new Person(30, "Saikat"));

            people.Add(new Person(26, "Rumon"));

            people.Add(new Person(24, "Jubayer"));

            people.Add(new Person(25, "Khalid"));

            people.Add(new Person(6, "Ismail"));

            Console.WriteLine("Unsorted list");

            people.ForEach(delegate(Person p)

            { Console.WriteLine(String.Format("{0} {1}", p.age, p.name)); });

            // Find the young

            List<Person> young = people.FindAll(delegate(Person p) { return p.age < 25; });

            Console.WriteLine("Age is less than 25");

            young.ForEach(delegate(Person p)

            { Console.WriteLine(String.Format("{0} {1}", p.age, p.name)); });

            // Sort by name

            Console.WriteLine("Sorted list, by name");

            people.Sort(delegate(Person p1, Person p2)

            { return p1.name.CompareTo(p2.name); });

            people.ForEach(delegate(Person p)

            { Console.WriteLine(String.Format("{0} {1}", p.age, p.name)); });

            // Sort by age

            Console.WriteLine("Sorted list, by age");

            people.Sort(delegate(Person p1, Person p2)

            { return p1.age.CompareTo(p2.age); });

            people.ForEach(delegate(Person p)

            { Console.WriteLine(String.Format("{0} {1}", p.age, p.name)); });

            Console.ReadLine();

Step4:Run the project. You will see the result…