C# seems to lack function that PHP has

[harrylmh]

I want to check if a string "123" is a number. but C# seems to lack a
method tat does tat. the closest is char.isNumber where you can only
check one character at a time anyway.

Anyone knows a way around this? Or is there a method to do this
already?

Thanks

[Jon Skeet [C# MVP]]

Re: C# seems to lack function that PHP has

harrylmh <minghong@hotpo p.com> wrote:[color=blue]
> I want to check if a string "123" is a number. but C# seems to lack a
> method tat does tat. the closest is char.isNumber where you can only
> check one character at a time anyway.
>
> Anyone knows a way around this? Or is there a method to do this
> already?[/color]

Well, you can try to parse it using Int32.Parse or Convert.ToInt32 , and
catch the exception. Or you can use Double.TryParse with appropriate
options. Or you can use a simple home-grown method which checks for
every character being between 0 and 9 (to get rid of "simple"
violations) and then use either of the other options to check more
complicated things. I've found this hybrid approach to be the fastest
in simple benchmarking scenarios.

--
Jon Skeet - <skeet@pobox.co m>

http://www.pobox.com/~skeet

If replying to the group, please do not mail me too

[Benny Mathew]

Re: C# seems to lack function that PHP has

See if this function helps you..

private bool IsNumeric(strin g strNum)
{
try
{
Double.Parse(st rNum);
return true;
}
catch
{
return false;
}
}

Regards
Benny

harrylmh wrote:[color=blue]
> I want to check if a string "123" is a number. but C# seems to lack a
> method tat does tat. the closest is char.isNumber where you can only
> check one character at a time anyway.
>
> Anyone knows a way around this? Or is there a method to do this
> already?
>
> Thanks[/color]

[Bill P.]

Re: C# seems to lack function that PHP has

You could use a simple regex also:

return (Regex.IsMatch( inputString, "[0-9]"));

HTH,
Bill P.


"harrylmh" <minghong@hotpo p.com> wrote in message
news:pcsob05iv3 bou6dqehjc7ti73 de6cubnk3@4ax.c om...[color=blue]
> I want to check if a string "123" is a number. but C# seems to lack a
> method tat does tat. the closest is char.isNumber where you can only
> check one character at a time anyway.
>
> Anyone knows a way around this? Or is there a method to do this
> already?
>
> Thanks[/color]

[cody]

Re: C# seems to lack function that PHP has

Double.TryParse () will do it.

--
cody

[Freeware, Games and Humor]
www.deutronium.de.vu || www.deutronium.tk
"Bill P." <bill@no.spam.c om> schrieb im Newsbeitrag
news:We3vc.7738 3$mE4.26575@new ssvr25.news.pro digy.com...[color=blue]
> You could use a simple regex also:
>
> return (Regex.IsMatch( inputString, "[0-9]"));
>
> HTH,
> Bill P.
>
>
> "harrylmh" <minghong@hotpo p.com> wrote in message
> news:pcsob05iv3 bou6dqehjc7ti73 de6cubnk3@4ax.c om...[color=green]
> > I want to check if a string "123" is a number. but C# seems to lack a
> > method tat does tat. the closest is char.isNumber where you can only
> > check one character at a time anyway.
> >
> > Anyone knows a way around this? Or is there a method to do this
> > already?
> >
> > Thanks[/color]
>
>[/color]