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Char.IsNumber()

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This message was discovered on ASPFriends.com 'aspngcs' list.

Paul D. Murphy

I remember a thread a while back asking about IsNumeric in C#. The Char
type (something I never really need to use unless parsing for a Split())
exposes a static method IsNumber(); So I think the best way to approach
the IsNumeric might be something like this.

public bool IsNumeric
{
    foreach(System.Char c in System.String.ToCharArray())
    {
        if(!Char.IsNumber(c))
            return false;
    }

    return true;
}

    Paul D. Murphy
    Click here to reveal e-mail address
    "Teamwork is a lot of people doing what I say."

-----Original Message-----
From: Julian Voelcker [mailto:Click here to reveal e-mail address]=20
Sent: Friday, July 12, 2002 5:26 AM
To: aspngcs
Subject: [aspngcs] Re: Daylight Saving Time Problems

On Thu, 11 Jul 2002 11:34:15 -0400, Ryan Trudelle-Schwarz wrote:
[Original message clipped]

No, I don't really want to use that because the client will have to=20
change the times they enter into UTC, which I don't think is=20
satisfactory.

Cheers,

Julian Voelcker
The Virtual World (UK) Limited
Cirencester, United Kingdom

| [aspngcs] member Click here to reveal e-mail address =3D YOUR ID
| http://www.asplists.com/asplists/aspngcs.asp =3D JOIN/QUIT

Reply to this message...

Minh Truong

[Original message clipped]

Of course, this wouldn't work for strings like "2.99", "1E3", "1,000", or
"-2"

Reply to this message...

Remas Wojciechowski

As someone mentioned already, this method will yield faulty results for a
range of numbers. I belong to the fraction of try&catch on double.Parse()
proponents.

Remas
http://www.aspalliance.com/remas

----- Original Message -----
From: "Paul D. Murphy" <Click here to reveal e-mail address>
To: "aspngcs" <Click here to reveal e-mail address>
Sent: Friday, July 12, 2002 4:56 PM
Subject: [aspngcs] Char.IsNumber()

I remember a thread a while back asking about IsNumeric in C#. The Char
type (something I never really need to use unless parsing for a Split())
exposes a static method IsNumber(); So I think the best way to approach
the IsNumeric might be something like this.

public bool IsNumeric
{
foreach(System.Char c in System.String.ToCharArray())
{
if(!Char.IsNumber(c))
return false;
}

return true;
}

Paul D. Murphy
Click here to reveal e-mail address
"Teamwork is a lot of people doing what I say."

-----Original Message-----
From: Julian Voelcker [mailto:Click here to reveal e-mail address]
Sent: Friday, July 12, 2002 5:26 AM
To: aspngcs
Subject: [aspngcs] Re: Daylight Saving Time Problems

On Thu, 11 Jul 2002 11:34:15 -0400, Ryan Trudelle-Schwarz wrote:
[Original message clipped]

No, I don't really want to use that because the client will have to
change the times they enter into UTC, which I don't think is
satisfactory.

Cheers,

Julian Voelcker
The Virtual World (UK) Limited
Cirencester, United Kingdom

| [aspngcs] member Click here to reveal e-mail address = YOUR ID
| http://www.asplists.com/asplists/aspngcs.asp = JOIN/QUIT

| [aspngcs] member Click here to reveal e-mail address = YOUR ID
| http://www.asplists.com/asplists/aspngcs.asp = JOIN/QUIT

Reply to this message...

Ryan Trudelle-Schwarz

Any perf tests to see if that is less intensive then running a regex on
it?
I still belong to the faction of "try/catch only when absolutely
necessary, never as part of the logic" folks ;)

-> -----Original Message-----
-> From: Remas Wojciechowski [mailto:Click here to reveal e-mail address]
->
-> As someone mentioned already, this method will yield faulty results
for a
-> range of numbers. I belong to the fraction of try&catch on
double.Parse()
-> proponents.
->
-> Remas
-> http://www.aspalliance.com/remas
->
-> ----- Original Message -----
-> From: "Paul D. Murphy" <Click here to reveal e-mail address>
->
-> I remember a thread a while back asking about IsNumeric in C#. The
Char
-> type (something I never really need to use unless parsing for a
Split())
-> exposes a static method IsNumber(); So I think the best way to
approach
-> the IsNumeric might be something like this.
->
-> public bool IsNumeric
-> {
-> foreach(System.Char c in System.String.ToCharArray())
-> {
-> if(!Char.IsNumber(c))
-> return false;
-> }
->
-> return true;
-> }
->
-> Paul D. Murphy

---
[This E-mail scanned for viruses by Declude Virus]

Reply to this message...

	System.Char
	System.DateTime
	System.String

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