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Some methods are overloaded

The two methods named Equals are defined as overloaded methods in the Object class. (They have the same name and different formal argument lists.)

Some methods are meant to be overridden

Some of these methods are intended to be overridden for various purposes. This includes GetHashCode , and ToString .

Some methods are meant to be used as is

However, some of the methods, such as GetType are intended to be used as is without overriding.

Three distinct forms of polymorphism

From a practical programming viewpoint, polymorphism manifests itself in three distinct forms in C#:

  • Method overloading
  • Method overriding through class inheritance
  • Method overriding through interface inheritance

Method overloading

I will begin the discussion of polymorphism with method overloading, which is the simplest of the three. I will cover method overloading in this module andwill cover polymorphism based on overridden methods using class inheritance and interface inheritance in future modules.

Duplicate method names

C# allows you to have two or more method definitions in the same scope with the same name, provided that they have different formal argument lists. This ismethod overloading .

Compile-time polymorphism

Some authors refer to method overloading as a form of compile-time polymorphism , as distinguished from run-time polymorphism . This distinction comes from the fact that, for each method call, the compiler determines whichmethod (from a group of overloaded methods) will be executed. This decision is made when the program is compiled.

In contrast, with method overriding, the determination of which overridden method to execute isn't made until runtime.

Selection based on the argument list

In practice, with overloaded methods, the compiler simply examines the types, number, and order of the parameters being passed in a method call and selectsthe overloaded method having a matching formal argument list.

Preview

Keeping it short and simple

In these modules on polymorphism, I will explain sample programs that are as short and as simple as I know howto make them, while still illustrating the important points regarding polymorphism. My objective is to make the polymorphicconcepts as clear as possible without having those concepts clouded by other programming issues.

Because of their simplicity, these programs aren't likely to resemble problems that you will encounter in the real world. I will simply ask you totrust me when I tell you that polymorphism has enormous application in real world programming.

A sample program

I will explain a sample program named Polymorph01 to illustrate method overloading. A complete listing of the program is provided in Listing 4 near the end of the module.

Within the class and the hierarchy

Method overloading can occur both within a class definition, and vertically within the class inheritance hierarchy.

In other words, an overloaded method can be inherited into a class that defines other overloaded versions of the method.

The program named Polymorph01 illustrates both aspects of method overloading.

Questions & Answers

what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Xna game studio. OpenStax CNX. Feb 28, 2014 Download for free at https://legacy.cnx.org/content/col11634/1.6
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