What is the need for Factory Method
in C# (C Sharp)?

When your application has an abstract base class which is inherited by different derived classes, any derived class can be instantiated and the base class methods can be executed using that derived class instance.




Each derived class overrides the base class methods to provide a different implementation of the method. Now all that you require is a method which decides on which derived class has to be instantiated. This decision making method is known as factory method.

Here is an example:

public abstract class number {
public abstract void displayType();
}
public class oddNo:number {
public override void displayType() { Console.WriteLine(“Odd number”); }
}
public class evenNo:number {
public override void displayType() { Console.WriteLine(“Even number”); }
}
public class testClass {
public static number sampleFactoryMethod(int sampleNo) {
number num;
if(sampleNo%2==0) { num = new evenNo(); }
else { num = new oddNo(); }
return num;
}
public static void Main() {
int data = 11;
number obj = sampleFactoryMethod(data);
obj.displayType();
}
}

Output of this code will be: Odd number

In this example, sampleFactoryMethod makes the decision of which derived class instance has to be created. Hence this method implements the Factory Method Pattern in C#.

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