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

Simple example to template method pattern will be an abstract base class whose methods are implemented in its derived class. This example is demonstrated below:

abstract class baseClass {
public abstract void abstractMethod1();
public void templateMethod() {
Console.WriteLine(“Executing template method…”);
abstractMethod1();
}
}
class derivedClass:baseClass {
public override void abstractMethod1() {
Console.WriteLine(“abstractMethod1 is implemented by derivedClass”);
}
}
class testClass {
baseClass obj = new derivedClass();
obj.templateMethod();
}
Output of this code will be:
Executing template method…
abstractMethod1 is implemented by derivedClass

In this example, templateMethod is implemented by baseClass but the method abstractMethod1 is not implemented by baseClass. It is expected to be implemented by the derived class of baseClass. That is where template method pattern is utilized.

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