C# Constructors

What is a Constructor?

A constructor is a special method in C# used to initialize objects of a class. It is automatically called when an object is created. Constructors typically set initial values for the object's fields or perform setup tasks.

Key Points About Constructors

• Constructor has the same name as the class.
• It does not have a return type, not even void.
• Automatically called when an object is created.
• A class can have multiple constructors with different parameters (constructor overloading).
• Ensures that the object starts in a valid state.

Types of Constructors in C#

• Default Constructor: No parameters. Sets default values.
• Parameterized Constructor: Takes arguments to initialize the object.
• Static Constructor: Initializes static members. Called once before the first object.

Example: Parameterized Constructor

using System;

class Car
{
    public string Model;
    public string Color;

    // Constructor
    public Car(string model, string color)
    {
        Model = model;
        Color = color;
        Console.WriteLine("Car object created!");
    }

    public void DisplayInfo()
    {
        Console.WriteLine($"Model: {Model}, Color: {Color}");
    }
}

class Program
{
    static void Main()
    {
        // Creating an object calls the constructor
        Car myCar = new Car("BMW", "Red");
        myCar.DisplayInfo();
    }
}

    

Output

Car object created!
Model: BMW, Color: Red