Recfatoring Switch with Ploymorphism

Question

Hi Experts While reading I have come across that we can refactor Switch statement with OOP Paradigm Ploymorphism. I got some links but quite confusing. Can you explain them with a simple example. Any help appreciated.

Jaganathan Bantheswaran · Answer

You misunderstood the concept here. We can eliminate the switch case by using Polymorphism only where your are following OOP design but NOT in normal Switch usage like you example. If you want to use polymorphism then your methods class structure should be as my example[Should follow OOP].

Shankar M · Answer

Hi Jaganthan Thanks for your prompt reply. Can you Please explain how this can be achieved. how can use Polymorphism in this case to elimimate using Switch statement For Ex: foreach (DataRow dr in dt.Rows) { switch(dr[value].ToString()) { case a : MethodA(); break; case a : MethodB(); break; case a : MethodC(); break; } } Thanks Shankar M

Jaganathan Bantheswaran · Answer

Hi If you are designing an application with OOPs C# & you are using Switch Statement we can replace the switch statement with polymorphism concept. Here is working example using System.IO; using System; class Program { static void Main() { Animal[] ani = new Animal[] { new Dog() new Cat() }; // Using Switch foreach (Animal a in ani) { a.makeSound(); var type = a.GetType(); switch (type.ToString()) { case Dog: a.makeSound(); break; case Cat: a.makeSound(); break; } } //Eliminating Switch foreach(Animal animal in ani) { animal.makeSound(); } } abstract class Animal { public abstract void makeSound(); } class Dog : Animal { public override void makeSound() { Console.WriteLine(Woof!); } } class Cat : Animal { public override void makeSound() { Console.WriteLine(Meow!); } } }