C# constructor | Types of constructor
In the earlier tutorial, we discuss class and object in C# . The constructor is a special member function of class. Member functions are those members that provide functionality for manipulating the data in the class. We can declare a method that has the same name as the containing class and does not have any return type even void.
There are two types of constructor
• Default constructor
• Custom constructor/ parameterized constructor
C# Static constructor
A static constructor will be executed only once as opposed to the constructor return so far which are instance constructor that is executed whenever an object of that class I created. And use static is a keyword.
If a class contains nothing but static method and properties the class itself can become static. A static class is functionally the same as creating a class with a private static constructor and instance of the class can never be created.
Let's create an example of a contractor in C# programming.
C# Custom constructor/ parameterized constructor-
The parameterized constructor contains the parameters is known the parameterized constructor or custom constructor. It is used to provide a different value to different objects. We can create distinct objects of the class and use different values.
Let's create an example of C# custom constructor or parameterized constructor.
using System;
namespace TriangleApplication {
public class Triangle{
public double b; // base of a Triangle
public double h; // Height of a Triangle
public double ar;
public Triangle() {
Console.WriteLine("The Object is being created");
}
public void area(double b,double h)
{
ar = h*b/2;
}
public double getarea() {
return ar;
}
public static void Main(string[] args) {
Triangle trngle = new Triangle();
// Set Triangle base and heigh values
trngle.area(2.0,6.0);
Console.WriteLine("Area of a triangle : {0}", trngle.getarea());
}
}
}
Output -
The object is being created Area of a triangle: 6
In the above C# example, we created a constructor with the same name as the class.
C# Default constructor : Non parameterized constructor -
A default constructor does not contain any argument(s )is known as default constructor or Non parameterized constructor .
It invoked at the time of creating an object.
C# default constructor example-
using System;
namespace RectangleApplication {
public class Rectangle{
public double w; // Width of a Rectangle
public double h; // Height of a Rectangle
public double ar;
public Rectangle() {
Console.WriteLine("The Object is being created");
}
public void area()
{
w=5.0;
h=3.0;
ar = w*h;
}
public double getarea() {
return ar;
}
public static void Main(string[] args) {
Rectangle rect = new Rectangle();
rect.area();
Console.WriteLine("Area of Rectangle A=wl: {0}", rect.getarea());
}
}
}
Output -
The Object is being created Area of Rectangle A=wl: 15
