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What do you do with invalid data

It usually isn't too difficult to write code to implement a set of rules to validate the incoming data. The hard part is figuring out what to do if theincoming data is not valid. The choices range all the way from flagging the data as invalid as shown in Listing 4 to throwing an exception which, if not properly handled, will cause the program to terminate. The circumstances dictate theaction to be taken.

Program output

The code in Listing 3 calls the setColor method twice. The first call passes a valid string, "Red", as a parameter. The second call passes an invalid string, "Green", as a parameter. This causes the second and third lines of text in Figure 1 to be displayed by the program.

Set, get, and display a property value with a valid value

As mentioned earlier, C# uses a special approach to identify properties. (You will see the code in TargetClass that accomplishes this shortly.) In the meantime, the code in Listing 5 (which is still part of the Main method) first sets, then gets, and finally displays the value of a property named height belonging to the object referenced by the contents of the variable named obj .

Listing 5 . Set, get, and display a property value with a valid value.

obj.height = 20; Console.WriteLine("height: " + obj.height);

Looks can be deceiving

If you compare Listing 5 with Listing 1 , you will see that there is essentially no difference in the syntax of the code in the two listings. The syntax in both listings suggests that a value is beingdirectly assigned to a public instance variable belonging to the object. As we already know, that is true for Listing 1 . However, that is not true for Listing 5 .

A set Accessor method

Although it doesn't look like it, the code in Listing 5 is actually calling a special set Accessor method that hides the implementation behind a public interface. As you will see shortly, this special method contains validation code similarwhat you saw in Listing 4 .

A get Accessor method

Once again, although it doesn't look like it, the last statement in Listing 5 is actually calling a special get Accessor method belonging to the object to get the current value of the property. That method returns the value stored in the property. As before, thereturned value is concatenated with a literal string and passed to the WriteLine method of the Console class for display on the black screen.

The set Accessor and get Accessor methods for the property named height

Returning to the class named TargetClass , the special set Accessor and get Accessor methods for the property named height are shown in Listing 6 .

Listing 6 . The set Accessor and get Accessor methods for the property named height.

private int heightData; public int height{get{ return heightData;}//end get set{//Validating code if(value<84){ heightData = value;}else{ heightData = 0;}//end else }//end set}//end height property

A hidden parameter named value

The value on the right side of the assignment operator in Listing 5 arrives on the set side of the code in Listing 6 as a hidden parameter named value .

Questions & Answers

anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
Introduction about quantum dots in nanotechnology
Praveena Reply
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
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
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
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
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
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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