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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

where we get a research paper on Nano chemistry....?
Maira Reply
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
hey
Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
ya I also want to know the raman spectra
Bhagvanji
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
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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