IsNumeric validation Compact Framework 2.0

[Malani Czornon]

Hi, are there any function in C# to validate that the value from a textbox
to be numeric ?

Thanks in advance.

 

[Chris Tacke, eMVP]

Depending on your needs, most of the Parse functions would work:

int myval = int.Parse(textBox.Text);
float myval = float.Parse(textBox.Text);

etc.


--

Chris Tacke, Embedded MVP
OpenNETCF Consulting
Giving back to the embedded community
http://community.OpenNETCF.com

 

[Malani Czornon]

Thanks Chirs for your reply, but Parse doesn´t return true or false.... it
returns an expection....
I need to get a bool value...

 

[Chris Tacke, eMVP]

I see. That's way more complex then.

public bool IsInt(string value)
{
try { int.Parse(value); }
catch { return false; }
return true;
}

Close to quantum physics.


--

Chris Tacke, Embedded MVP
OpenNETCF Consulting
Giving back to the embedded community
http://community.OpenNETCF.com

 

[Serge Wautier]

Chris,

Beware of quantum physics. This stuff is way too unstable to be used in a
beginner's program: Catching the exception is somehow measuring it, which
would bring Heisenberg and his uncertainty principle into the game. From
there on, false would no longer be sure whether he's actually as false as
that, which would probably lead to more exceptions being thrown randomly.
You'd probably need to include some statistical physics library into your
program to analyze the spectrum of these exceptions. Monte Carlo would
surely help. And that's where it hurts: Do Monte Carlo implementations
internally use bool results? Better not because they'd start colliding into
these other bools they are evaluating, which might actually lead to a bool
fission reaction. Which by globally destroying the whole binary system would
somehow solve the OP's concern the hard way (lack of any form of computer, I
mean). And all we wanted to do is to know if a string can be converted to an
int. I warned you: Unstable stuff, this quantum physics.

BTW, do you think this could be considered experimental evidence of the
butterfly effect? Someone should give it a try some day.

Serge.
http://www.apptranslator.com

 

[Manoj Kumar]

Hi, are there any function in C# to validate that the value from a textbox
to be numeric ?

Thanks in advance.

Have you tried int.tryParse

int i = -1;
bool isNumeric = int.tryParse(textBox1.Text, out i);

If isNumeric is true then i holds numeric value.

 

[Serge Wautier]

No TryParse in CF :-(

HTH,

Serge.
http://www.apptranslator.com - Localization tool for your applications

Hi, are there any function in C# to validate that the value from a textbox
to be numeric ?

Thanks in advance.

Have you tried int.tryParse

int i = -1;
bool isNumeric = int.tryParse(textBox1.Text, out i);

If isNumeric is true then i holds numeric value.

 

[davebythesea]

Hi,

Maybe creating your own control which inherits from TextBox and only allows
to input a number value or digit?

Dav

 

[Arun]

May be something like this

class NumericTextBox : TextBox
{
protected override void OnKeyPress(KeyPressEventArgs e)
{
base.OnKeyPress(e);
if (Char.IsDigit(e.KeyChar) ||
Char.IsControl(e.KeyChar) ||
(e.KeyChar == '\b'))
{
// Digits/Control commands/backspace are OK
}
else
{
// Swallow this invalid key
e.Handled = true;
return;
}
}
}

or use setinputmode
http://msdn.microsoft.com/en-us/library/microsoft.windowsce.forms.inputmodeeditor.setinputmode.aspx

Hope this helps,
Cheers,
Arun

 

[Arun]

Better use word "Numeric TextBox" and do a google compact framework
group search
http://groups.google.com/advanced_group_search
you will get lots of threads discussed the same topic and few will
really help you.

Cheers,
Arun

 

[Malani Czornon]

Thanks a lot to all!!
I´ll search the best way to do it.

"Arun" <[email protected]> escribió en el mensaje
Better use word "Numeric TextBox" and do a google compact framework
group search
http://groups.google.com/advanced_group_search
you will get lots of threads discussed the same topic and few will
really help you.

Cheers,
Arun

 

[Mayank Parmar]

public static bool isPosInteger(string strInput)
{
Regex rx = new Regex(@"^\d+$");
if (rx.IsMatch(strInput))
{
return true;
}
else
{
return false;
}
}

public static bool isNumeric(string strInput)
{
Regex rx = new
Regex(@"([+-][0-9]+\.[0-9]*)|([0-9]*\.[0-9]+)|([0-9]+)");
if (rx.IsMatch(strInput))
{
return true;
}
else
{
return false;
}
}

public static bool isPosNumber(string strInput, bool required, int
numDecimals)
{
if (required)
{
if (strInput == "" || strInput == null)
{
return false;
}
}
else
{
if (strInput == "" || strInput == null)
{
return true;
}
}
Regex rx = new Regex(@"^(?=.*[0-9].*$)\d{0,}(?:\.\d{0," + numDecimals
+ "})?$");
if (rx.IsMatch(strInput))
{
return true;
}
else
{
return false;
}
}

Please check I have created functions, which one is helpful to you.

Regards,
Mayank Parmar
http://developereye.blogspot.com/