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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 is math number
Tric Reply
x-2y+3z=-3 2x-y+z=7 -x+3y-z=6
Sidiki Reply
Need help solving this problem (2/7)^-2
Simone Reply
x+2y-z=7
Sidiki
what is the coefficient of -4×
Mehri Reply
-1
Shedrak
the operation * is x * y =x + y/ 1+(x × y) show if the operation is commutative if x × y is not equal to -1
Alfred Reply
An investment account was opened with an initial deposit of $9,600 and earns 7.4% interest, compounded continuously. How much will the account be worth after 15 years?
Kala Reply
lim x to infinity e^1-e^-1/log(1+x)
given eccentricity and a point find the equiation
Moses Reply
12, 17, 22.... 25th term
Alexandra Reply
12, 17, 22.... 25th term
Akash
College algebra is really hard?
Shirleen Reply
Absolutely, for me. My problems with math started in First grade...involving a nun Sister Anastasia, bad vision, talking & getting expelled from Catholic school. When it comes to math I just can't focus and all I can hear is our family silverware banging and clanging on the pink Formica table.
Carole
I'm 13 and I understand it great
AJ
I am 1 year old but I can do it! 1+1=2 proof very hard for me though.
Atone
hi
Adu
Not really they are just easy concepts which can be understood if you have great basics. I am 14 I understood them easily.
Vedant
find the 15th term of the geometric sequince whose first is 18 and last term of 387
Jerwin Reply
I know this work
salma
The given of f(x=x-2. then what is the value of this f(3) 5f(x+1)
virgelyn Reply
hmm well what is the answer
Abhi
If f(x) = x-2 then, f(3) when 5f(x+1) 5((3-2)+1) 5(1+1) 5(2) 10
Augustine
how do they get the third part x = (32)5/4
kinnecy Reply
make 5/4 into a mixed number, make that a decimal, and then multiply 32 by the decimal 5/4 turns out to be
AJ
how
Sheref
can someone help me with some logarithmic and exponential equations.
Jeffrey Reply
sure. what is your question?
ninjadapaul
20/(×-6^2)
Salomon
okay, so you have 6 raised to the power of 2. what is that part of your answer
ninjadapaul
I don't understand what the A with approx sign and the boxed x mean
ninjadapaul
it think it's written 20/(X-6)^2 so it's 20 divided by X-6 squared
Salomon
I'm not sure why it wrote it the other way
Salomon
I got X =-6
Salomon
ok. so take the square root of both sides, now you have plus or minus the square root of 20= x-6
ninjadapaul
oops. ignore that.
ninjadapaul
so you not have an equal sign anywhere in the original equation?
ninjadapaul
hmm
Abhi
is it a question of log
Abhi
🤔.
Abhi
I rally confuse this number And equations too I need exactly help
salma
But this is not salma it's Faiza live in lousvile Ky I garbage this so I am going collage with JCTC that the of the collage thank you my friends
salma
Commplementary angles
Idrissa Reply
hello
Sherica
im all ears I need to learn
Sherica
right! what he said ⤴⤴⤴
Tamia
hii
Uday
hi
salma
hi
Ayuba
Hello
opoku
hi
Ali
greetings from Iran
Ali
salut. from Algeria
Bach
hi
Nharnhar
A soccer field is a rectangle 130 meters wide and 110 meters long. The coach asks players to run from one corner to the other corner diagonally across. What is that distance, to the nearest tenths place.
Kimberly Reply
Jeannette has $5 and $10 bills in her wallet. The number of fives is three more than six times the number of tens. Let t represent the number of tens. Write an expression for the number of fives.
August Reply
What is the expressiin for seven less than four times the number of nickels
Leonardo Reply
How do i figure this problem out.
how do you translate this in Algebraic Expressions
linda Reply
why surface tension is zero at critical temperature
Shanjida
I think if critical temperature denote high temperature then a liquid stats boils that time the water stats to evaporate so some moles of h2o to up and due to high temp the bonding break they have low density so it can be a reason
s.
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris 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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