need info about how i can create program that user can re-enter data.

Question

1.00/5 (1 vote)

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I need help on how I can allow the user to re-enter data that has been detected as invalid (not exit the program).

for example how can I make this to be re-entered and not exit. :

C#

 Console.Write("Enter Street Number >");
                    vtemp = Console.ReadLine();
                    street_number = vtemp;
                    if (string.IsNullOrEmpty(street_number))
                    {
                        Console.WriteLine("Please enter correct data");
                        return; 
}

Thanks

Posted 19-Aug-12 20:43pm

malakas1821

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Sergey Alexandrovich Kryukov · Answer 1 · 2012-08-19T20:51:00

Solution 1

Of course you can request the same data in the loop until the user meets the input data constraints. That should answer your question.

However, it's pretty ugly and annoying to the users. Most cultured console applications are designed to be used without any interactive input. Instead, all the parameters are entered at once in a command line. If there are too many of them, one or more of the parameters could specify some kind of input file(s) where you put most of input parameters. (There are some notorious exclusions from this no-interactive rule of thumb though.)

If you what to go in this way, you can use my robust easy-to-use command line parsing utility:
Enumeration-based Command Line Utility[^].

You can use another more comprehensive (but perhaps less easy to use for a developer) library I referenced in my article.

Alternatively, you can think to provide more convenient user input through windowed UI, either with System.Windows.Forms or WPF library.

—SA

Posted 19-Aug-12 20:51pm

Sergey Alexandrovich Kryukov

Updated 19-Aug-12 20:53pm

v3

Comments

malakas1821 20-Aug-12 2:57am

can I use for Loop, while or do while Loop to do this ?

Sergey Alexandrovich Kryukov 20-Aug-12 3:10am

Are you a developer or not?! The answer is -- whatever you want.
If in doubt, put some code using "Improve question" and let us help you to fix it if it does not work.
Or did I just wasted my time on you?

I told you -- don't do it, use command line. What prevents you from doing it?

And I just wonder if you voted 1? and, if so, why?

--SA

malakas1821 20-Aug-12 3:13am

Im a programming student for 4 weeks.

Sergey Alexandrovich Kryukov 20-Aug-12 3:17am

That was not my question... :-)

Just follow my advice and accept this answer formally (green button). If you show the code and needs help, we will gladly help you.
--SA

malakas1821 20-Aug-12 3:34am

Sorry but I need to use for,while or do loop to do it.

AmitGajjar 20-Aug-12 3:11am

good answer 5+, even i prefer Window application / WPF instead of command line utility.

Sergey Alexandrovich Kryukov 20-Aug-12 3:21am

Thank you, Amit.
The choice of console utility vs Forms/WPF/Metro/... is not only the matter of preference but the class of the problem and general style. Some utilities are needed to be used in other console-based work, such as batch, builds, etc...
By the way, command line does not mean console-only, is used an absolutely all applications...
--SA

AmitGajjar 20-Aug-12 3:24am

ok, thanks for the information.

**AmitGajjar** · Answer 2 · 2012-08-19T21:08:00

Solution 2

Hi,

You can use do... while loop to do the same. you need to come out from the while loop when you are getting correct date, till you can ask user to enter correct data again and again.

But i prefer you to add some limit say 10 or 20 times to enter invalid data then application should be exit with appropriate message.

Thanks
-Amit Gajjar

Posted 19-Aug-12 21:08pm

AmitGajjar

Updated 19-Aug-12 21:09pm

v2

Comments

malakas1821 20-Aug-12 3:11am

give me an example.

AmitGajjar 20-Aug-12 3:12am

http://msdn.microsoft.com/en-us/library/370s1zax.aspx