Folks,
I need to try and make sure that a given string is a valid numerical
value (not just int, or int32 - it could be float, decimal, what have
you). VB.NET has a neat "IsNumeric" function - too bad C# doesn't have
anything similar. Or does it??
I was thinking about trying to convert the string to Int32, but as I
mentioned - that alone won't be good enough, and I really don't want
to attempt a dozen conversions to find out - nor do I really want to
start parsing the string for numerical characters (since there can be
"+", "-", "." and many more extra character and it's still a valid
numeric).
Any ideas? Thoughts?
Thanks!
Marc
=============== =============== =============== =============== ====
Marc Scheuner May The Source Be With You!
Bern, Switzerland m.scheuner(at)i nova.ch
5  6623 
Two ways. You can either try to convert the string in a try block. If an
exception is thrown, it is not a number.
Alternatively, you can reference the VB.NET assembly (which is located in
the references dialog) and use the IsNumeric function available to VB
developers.
"Marc Scheuner [MVP ADSI]" <m.********@ino va.SPAMBEGONE.c h> wrote in message
news:s7******** *************** *********@4ax.c om... Folks,
I need to try and make sure that a given string is a valid numerical
value (not just int, or int32 - it could be float, decimal, what have
you). VB.NET has a neat "IsNumeric" function - too bad C# doesn't have
anything similar. Or does it??
I was thinking about trying to convert the string to Int32, but as I
mentioned - that alone won't be good enough, and I really don't want
to attempt a dozen conversions to find out - nor do I really want to
start parsing the string for numerical characters (since there can be
"+", "-", "." and many more extra character and it's still a valid
numeric).
Any ideas? Thoughts?
Thanks!
Marc
=============== =============== =============== =============== ====
Marc Scheuner May The Source Be With You!
Bern, Switzerland m.scheuner(at)i nova.ch
> I was thinking about trying to convert the string to Int32, but as I mentioned - that alone won't be good enough, and I really don't want
Here are a few ways:
1. Pick the lowest common denominator. Cast it to a decimal.
2. Use a regex. There are plenty of places you can find the right pattern
if you dont know it.
3. Use a control that does it. In some cases in my windows.forms app I am
using the numeric up down control.
4. Catch the KeyDown event and check the input.
etc..
etc...
JF
Hello Marc, I need to try and make sure that a given string is a
valid numerical value (not just int, or int32 - it
could be float, decimal, what have you). VB.NET has
a neat "IsNumeric" function - too bad C# doesn't have
anything similar. Or does it??
The static Double.TryParse method may be of interest to you.
Hope this helps,
Len
I think the easiest way would be to use a simple regular expression. I
have been using regular expressions and I have found them to be very
easy and extremely powerful and flexible. A great source for learing
them is Mastering Regular Expressions - and O Reily book or get it from www.regexlib.com.
Matt
*** Sent via Developersdex http://www.developersdex.com ***
Don't just participate in USENET...get rewarded for it!
Out of curiosity, what do you want back as the answer? A boolean? An
exception?
--
..tom
remove email address' dashes for replies
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