constructor and destructor in c# with example

constructor and destructor in c# with example

A constructor looks like a special method having no return type and its name is the same as the class name.

If we do not declare a constructor explicitly for a class, the compiler will create a default constructor at run time.

Access modifiers of the constructor can be public, private, protected, internal and extern.

A public constructor is called when the class is instantiated.

 A private constructor prevents the creation of the object of the class. It is used in classes having only static members.

A class having an internal constructor cannot be instantiated outside of the assembly.

A protected constructor of a base class can only be called from the derived class within a derived class constructor.

When a constructor having an extern modifier, the constructor is said to be an external constructor, because the same does not provide any actual implementation.

Follow The example constructor and destructor in c# with example.

using System;

class Person {

 public string firstName;

 public string lastName;

 public int age;

 public Person() {

  Console.WriteLine("Object is being created");

 }

 ~Person() {

  Console.WriteLine("Object is being deleted");

 }

 public string fullName() {

  string str = firstName + " " + lastName;

  return str;

 }

 public void setAge(int num) {

  age = num;

 }

}

class Program {

 static void Main(string[] args) {

  Person person1 = new Person();

  person1.firstName = "Thomas";

  person1.lastName = "Gates";

  person1.setAge(25);

  Console.WriteLine("Full Name : {0}", person1.fullName());

  Console.WriteLine("Age : {0}", person1.age);

 }

}