Will the base class constructor be automatically called?

Question

class Person
{
    public int age;
    public Person()
    {
        age = 1;
    }
}

class Customer : Person
{
    public Customer()
    {
        age += 1;
    }
         


        

Answer 1

base() is called by default but it can be used for other purpose such as :

1. base()` method is used to pass the value to the parent class construct or
2. to call the no-arg constructor of parent class .

for example:

Case 1: if parent have parametrized constructor but not default or no-arg constructor.

 class Person
 {

    private string FirstName;
    private string LastName;
    private string EmailAddress;
    private DateTime DateOfBirth;

    public Person(string firstName, string lastName, string emailAddress, DateTime dateOfBirth)
    {
        FirstName = firstName;
        LastName = lastName;
        EmailAddress = emailAddress;
        DateOfBirth = dateOfBirth;

    }
    }
class Employee : Person
{
    private double Salary { get; set; } = 0;

    public Employee(string firstName, string lastName, string emailAddress, DateTime dateOfBirth,double salary)
        :base(firstName,lastName,emailAddress,dateOfBirth)// used to pass value to parent constructor and it is mandatory if parent doesn't have the no-argument constructor.
    {
        Salary = salary;
    }
}

Case 2: when parent have more than one constructor along with default one.

class Person
{

    private string FirstName;
    private string LastName;
    private string EmailAddress;
    private DateTime DateOfBirth;

    public Person()
    {
        // some important intialization's to be done  

    }

    public Person(string firstName, string lastName, string emailAddress, DateTime dateOfBirth)
    {
        FirstName = firstName;
        LastName = lastName;
        EmailAddress = emailAddress;
        DateOfBirth = dateOfBirth;

    }
    }
class PermanentEmployee : Person
{
    public double HRA { get; set; }
    public double DA { get; set; }
    public double Tax { get; set; }
    public double NetPay { get; set; }
    public double TotalPay { get; set; }

    public PermanentEmployee(double hRA, double dA, double tax, double netPay, double totalPay) : base();
    {
        HRA = hRA;
        DA = dA;
        Tax = tax;
        NetPay = netPay;
        TotalPay = totalPay;
    }
}

Here we are calling a no-arg constructor manually by base() to perform some intilizations but doesn'e passed any value.

Hope this will help you.