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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

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
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
characteristics of micro business
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 ?
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.
what is the actual application of fullerenes nowadays?
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.
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.
is Bucky paper clear?
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.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
what is the k.e before it land
what is the function of carbon nanotubes?
I'm interested in nanotube
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
what is system testing
what is the application of nanotechnology?
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
anybody can imagine what will be happen after 100 years from now in nano tech world
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
silver nanoparticles could handle the job?
not now but maybe in future only AgNP maybe any other nanomaterials
I'm interested in Nanotube
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
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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