CODEWITHSUNDEEP
c#arrayspolymorphism
ScreamoIsDead
ScreamoIsDead

Reputation: 367

Cant call method with array argument c#

Im following a tutorial based on SOLID principles but i fail to understand how to actually implement this method, here is the tutorial Link

I faily understand the concept of the code but i cant figure out how to actually call the AreaCalculator.Area method from my Main

How do i call the method to either calculate the Rectangle Area or the Circle Area? based on the code in the tutorial

Area(Circle with 10 radius);
Area(Rectangle with 10 width and 5 height);

Shape.cs

public abstract class Shape
{
    public abstract double Area();
}

Circle.cs

    public class Circle : Shape
    {
        public double Radius { get; set; }
        public override double Area()
        {
            return Radius * Radius * Math.PI;
        }
    }

Rectangle.cs

    public class Rectangle : Shape
    {
        public double Width { get; set; }
        public double Height { get; set; }
        public override double Area()
        {
            return Width * Height;
        }
    }

AreaCalculator.cs

public static double Area(Shape[] shapes)
        {
            double area = 0;
            foreach (var shape in shapes)
            {
                area += shape.Area();
            }

            return area;
        }

Thank you

Upvotes: 0

Views: 109

Answers (2)

Alex
Alex

Reputation: 3345

You need to instantiate instances of each shape and pass those as an array to the AreaCalculator.Area() method. The key take away is the Area method will take any objects that extend Shape.

var circle = new Circle();
circle.Radius = 5;

var rectangle = new Rectangle();
rectangle.Width = 10;
rectangle.Height = 3;

var area = AreaCalculator.Area(new Shape[] {circle, rectangle});

Or more succinctly

AreaCalculator.Area(new Shape[]{
    new Circle() {Radius = 5},
    new Rectangle() {Width = 10, Height = 3}
});

Upvotes: 1

Johnathan Barclay
Johnathan Barclay

Reputation: 20353

var circle = new Circle { Radius = 10 };                  // Create a circle
var rectangle = new Rectangle { Width = 10, Height = 5 }; // Create a rectangle

var shapes = new Shape[] { circle, rectangle };           // Create array of shapes

double area = AreaCalculator.Area(shapes);                // Call Area method with array

If you only need the area of a single shape, the AreaCalculator is unneccesary; simply call the Area method on an individual shape:

double circleArea = circle.Area();
double rectangleArea = rectangle.Area();

Upvotes: 2

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