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C# Inheritance

March 30, 2017

We generally apply the concept of inheritance to implement a IS-A relationship. For example to implement a relationship that says an Apple is a Fruit or Earth is a cosmic object. We use inheritance very carefully so that it does not lead to long complex/un-maintainable object hierarchies, but to implement very specific object hierarchies with least coupling as possible. Below is simple to show how we implement Inheritance in C# –

Parent Class – VisibleObject
using System;
 
namespace Inheritance
{
    public class VisibleObject
    {
        public string Visibility { get; set; }
 
        public void Copy()
        {
            Console.WriteLine("The Object was Copied");
 
        }
 
        public void Move()
        {
            Console.WriteLine("The object was moved");
        }
    }
}
 
Child Class – Verbiage
Note how we use the ‘:’ operator to inherit parent class
using System;
 
namespace Inheritance
{
    public class Verbiage : VisibleObject
    {
        public float FontSize { get; set; }
 
        public string Font { get; set; }
 
        public string Text { get; set; }
        public void AddHtml(Verbiage verbiage)
        {
            string html = "<html><body><div style=\"visibility: " + 
                   verbiage.Visibility + "\"><font type=\"" + 
                   verbiage.Font + "\" size=\"" + verbiage.FontSize + "\">" + 
                   verbiage.Text + "</font></div></body></html>";
            Console.WriteLine("Added HTML! {0}", html);
        }
    }
}
 
Usage – 
 
Note how the parent property and methods are accessed via the child object
namespace Inheritance
{
    class Program
    {
        static void Main(string[] args)
        {
            var verbiage = new Verbiage();
 
            //sets parent property
            verbiage.Visibility = "hidden";
            
            verbiage.Font = "Arial";
 
            verbiage.FontSize = 12;
 
            verbiage.Text = "Best Website on the internet!";
 
            verbiage.AddHtml(verbiage);
 
            //calls parent methods
            verbiage.Copy();
            verbiage.Move();
 
        }
    }
}
 

 

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