qr code generator c# example Why Overridden Methods in C#.NET

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Why Overridden Methods
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Overridden methods allow C# to support runtime polymorphism Polymorphism is essential to object-oriented programming for one reason: It allows a general class to specify methods that will be common to all of its derivatives, while allowing derived classes to define the specific implementation of some or all of those methods Overridden methods are another way that C# implements the one interface, multiple methods aspect of polymorphism Part of the key to applying polymorphism successfully is understanding that the base classes and derived classes form a hierarchy that moves from lesser to greater specialization Used correctly, the base class provides all elements that a derived class can use directly Through virtual methods, it also defines those methods that the derived class can implement on its own This allows the derived class flexibility, yet still enforces a consistent interface Thus, by combining inheritance with overridden methods, a base class can define the general form of the methods that will be used by all of its derived classes
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Part I:
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The C# Language
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To better understand the power of virtual methods, we will apply them to the TwoDShape class In the preceding examples, each class derived from TwoDShape defines a method called Area( ) This suggests that it might be better to make Area( ) a virtual method of the TwoDShape class, allowing each derived class to override it, defining how the area is calculated for the type of shape that the class encapsulates The following program does this For convenience, it also adds a name property to TwoDShape (This makes it easier to demonstrate the classes)
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// Use virtual methods and polymorphism using System; class TwoDShape { double pri_width; double pri_height; // A default constructor public TwoDShape() { Width = Height = 00; name = "null"; } // Parameterized constructor public TwoDShape(double w, double h, string n) { Width = w; Height = h; name = n; } // Construct object with equal width and height public TwoDShape(double x, string n) { Width = Height = x; name = n; } // Construct a copy of a TwoDShape object public TwoDShape(TwoDShape ob) { Width = obWidth; Height = obHeight; name = obname; } // Properties for Width and Height public double Width { get { return pri_width; } set { pri_width = value < 0 -value : value; } } public double Height { get { return pri_height; } set { pri_height = value < 0 -value : value; } }
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Inheritance
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public string name { get; set; } public void ShowDim() { ConsoleWriteLine("Width and height are " + Width + " and " + Height); } public virtual double Area() { ConsoleWriteLine("Area() must be overridden"); return 00; } } // A derived class of TwoDShape for triangles class Triangle : TwoDShape { string Style; // A default constructor public Triangle() { Style = "null"; } // Constructor for Triangle public Triangle(string s, double w, double h) : base(w, h, "triangle") { Style = s; } // Construct an isosceles triangle public Triangle(double x) : base(x, "triangle") { Style = "isosceles"; } // Construct a copy of a Triangle object public Triangle(Triangle ob) : base(ob) { Style = obStyle; } // Override Area() for Triangle public override double Area() { return Width * Height / 2; } // Display a triangle's style public void ShowStyle() { ConsoleWriteLine("Triangle is " + Style); } } // A derived class of TwoDShape for rectangles class Rectangle : TwoDShape { // Constructor for Rectangle public Rectangle(double w, double h) : base(w, h, "rectangle"){ }
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PART I PART I PART I
Part I:
The C# Language
// Construct a square public Rectangle(double x) : base(x, "rectangle") { } // Construct a copy of a Rectangle object public Rectangle(Rectangle ob) : base(ob) { } // Return true if the rectangle is square public bool IsSquare() { if(Width == Height) return true; return false; } // Override Area() for Rectangle public override double Area() { return Width * Height; } } class DynShapes { static void Main() { TwoDShape[] shapes = new TwoDShape[5]; shapes[0] shapes[1] shapes[2] shapes[3] shapes[4] = = = = = new new new new new Triangle("right", 80, 120); Rectangle(10); Rectangle(10, 4); Triangle(70); TwoDShape(10, 20, "generic");
for(int i=0; i < shapesLength; i++) { ConsoleWriteLine("object is " + shapes[i]name); ConsoleWriteLine("Area is " + shapes[i]Area()); ConsoleWriteLine(); } } }
The output from the program is shown here:
object is triangle Area is 48 object is rectangle Area is 100 object is rectangle Area is 40 object is triangle Area is 245 object is generic Area() must be overridden Area is 0
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