Is there any IsNumeric in C#?

[Steve Kershaw]

Hello,
I have a need to see if a string is numeric or alphabetic. I understand
that Visual Basic has a method called "IsNumeric(stri ng)" but C#
dosen't appear to have one. Any ideas?

Thanks for your help

Steve

[Juan T. Llibre]

Import Microsoft.Visua lBasic and use it!

if (Microsoft.Visu alBasic.Informa tion.IsNumeric( "5"))
{
//Do Something
}

if (Microsoft.Visu alBasic.Informa tion.IsNumeric( "yadda"))
{
//Do Something
}

Juan T. Llibre, ASP.NET MVP
ASP.NET FAQ : http://asp.net.do/faq/
Foros de ASP.NET en Español : http://asp.net.do/foros/
=============== =============== ========
"Steve Kershaw" <st***********@ yahoo.com> wrote in message
news:11******** **************@ g43g2000cwa.goo glegroups.com.. .

Hello,
I have a need to see if a string is numeric or alphabetic. I understand
that Visual Basic has a method called "IsNumeric(stri ng)" but C#
dosen't appear to have one. Any ideas?

Thanks for your help

Steve

[Dave]

Steve,

Try this:

public static bool IsInteger(strin g theValue)
{
try
{
Convert.ToInt32 (theValue);
return true;
}
catch
{
return false;
}
}
}

"Steve Kershaw" wrote:

Hello,
I have a need to see if a string is numeric or alphabetic. I understand
that Visual Basic has a method called "IsNumeric(stri ng)" but C#
dosen't appear to have one. Any ideas?

Thanks for your help

Steve

[Juan T. Llibre]

From Scott Hanselman's blog at :

http://www.hanselman.com/blog/Explor...mericForC.aspx

Actually, this doesn't really do what IsNumeric does,
as IsNumeric should also return true for floating point numbers.

That code does not return true for floating point numbers,
which -nevertheless- *are* numbers.

That is really more of an "IsInt".

Importing Microsoft.Visua lBasic does the complete job.


Juan T. Llibre, ASP.NET MVP
ASP.NET FAQ : http://asp.net.do/faq/
Foros de ASP.NET en Español : http://asp.net.do/foros/
=============== =============== ========
"Dave" <Da**@discussio ns.microsoft.co m> wrote in message
news:D7******** *************** ***********@mic rosoft.com...

Steve,

Try this:

public static bool IsInteger(strin g theValue)
{
try
{
Convert.ToInt32 (theValue);
return true;
}
catch
{
return false;
}
}
}
"Steve Kershaw" wrote:

Hello,
I have a need to see if a string is numeric or alphabetic. I understand
that Visual Basic has a method called "IsNumeric(stri ng)" but C#
dosen't appear to have one. Any ideas?

Thanks for your help

Steve

[Kevin Spencer]

In the .Net 2.0 CLR, there is an Int32.TryParse( ) method that doesn't throw
an exception, and you can use that. In .Net 1.1, you're pretty much stuck
with the alternatives that the others have already proposed.

--
HTH,

Kevin Spencer
Microsoft MVP
..Net Developer
A watched clock never boils.

"Steve Kershaw" <st***********@ yahoo.com> wrote in message
news:11******** **************@ g43g2000cwa.goo glegroups.com.. .

Hello,
I have a need to see if a string is numeric or alphabetic. I understand
that Visual Basic has a method called "IsNumeric(stri ng)" but C#
dosen't appear to have one. Any ideas?

Thanks for your help

Steve

[Steve C. Orr [MVP, MCSD]]

There is no equivalent for this function in C#. VB.NET has lots of
functions that C# developers have to create manually.
Or, you can import the visual basic namespace and use its IsNumeric function
from within C#.

--
I hope this helps,
Steve C. Orr, MCSD, MVP
http://SteveOrr.net
"Steve Kershaw" <st***********@ yahoo.com> wrote in message
news:11******** **************@ g43g2000cwa.goo glegroups.com.. .

Hello,
I have a need to see if a string is numeric or alphabetic. I understand
that Visual Basic has a method called "IsNumeric(stri ng)" but C#
dosen't appear to have one. Any ideas?

Thanks for your help

Steve