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How to implement Open Closed principle using C#?
Software entities like classes, modules and functions should be open for extension but closed for modifications.
Definition − The Open Close Principle states that the design and writing of the code should be done in a way that new functionality should be added with minimum changes in the existing code. The design should be done in a way to allow the adding of new functionality as new classes, keeping as much as possible existing code unchanged.
Example
Code Before Open Closed Principle
using System;
using System.Net.Mail;
namespace SolidPrinciples.Open.Closed.Principle.Before{
public class Rectangle{
public int Width { get; set; }
public int Height { get; set; }
}
public class CombinedAreaCalculator{
public double Area (object[] shapes){
double area = 0;
foreach (var shape in shapes){
if(shape is Rectangle){
Rectangle rectangle = (Rectangle)shape;
area += rectangle.Width * rectangle.Height;
}
}
return area;
}
}
public class Circle{
public double Radius { get; set; }
}
public class CombinedAreaCalculatorChange{
public double Area(object[] shapes){
double area = 0;
foreach (var shape in shapes){
if (shape is Rectangle){
Rectangle rectangle = (Rectangle)shape;
area += rectangle.Width * rectangle.Height;
}
if (shape is Circle){
Circle circle = (Circle)shape;
area += (circle.Radius * circle.Radius) * Math.PI;
}
}
return area;
}
}
}Code After OpenClosed Principle
namespace SolidPrinciples.Open.Closed.Principle.After{
public abstract class Shape{
public abstract double Area();
}
public class Rectangle: Shape{
public int Width { get; set; }
public int Height { get; set; }
public override double Area(){
return Width * Height;
}
}
public class Circle : Shape{
public double Radius { get; set; }
public override double Area(){
return Radius * Radius * Math.PI;
}
}
public class CombinedAreaCalculator{
public double Area (Shape[] shapes){
double area = 0;
foreach (var shape in shapes){
area += shape.Area();
}
return area;
}
}
}
Updated on: 05-Dec-2020
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