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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

find the 15th term of the geometric sequince whose first is 18 and last term of 387
Jerwin Reply
I know this work
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
how do they get the third part x = (32)5/4
kinnecy Reply
can someone help me with some logarithmic and exponential equations.
Jeffrey Reply
sure. what is your question?
okay, so you have 6 raised to the power of 2. what is that part of your answer
I don't understand what the A with approx sign and the boxed x mean
it think it's written 20/(X-6)^2 so it's 20 divided by X-6 squared
I'm not sure why it wrote it the other way
I got X =-6
ok. so take the square root of both sides, now you have plus or minus the square root of 20= x-6
oops. ignore that.
so you not have an equal sign anywhere in the original equation?
is it a question of log
I rally confuse this number And equations too I need exactly help
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Commplementary angles
Idrissa Reply
im all ears I need to learn
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what is a good calculator for all algebra; would a Casio fx 260 work with all algebra equations? please name the cheapest, thanks.
Kevin Reply
a perfect square v²+2v+_
Dearan Reply
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Abdirahman Reply
algebra 2 Inequalities:If equation 2 = 0 it is an open set?
Kim Reply
or infinite solutions?
The answer is neither. The function, 2 = 0 cannot exist. Hence, the function is undefined.
Embra Reply
if |A| not equal to 0 and order of A is n prove that adj (adj A = |A|
Nancy Reply
rolling four fair dice and getting an even number an all four dice
ramon Reply
Kristine 2*2*2=8
Bridget Reply
Differences Between Laspeyres and Paasche Indices
Emedobi Reply
No. 7x -4y is simplified from 4x + (3y + 3x) -7y
Mary Reply
how do you translate this in Algebraic Expressions
linda Reply
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
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
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
bamidele 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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