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.NET Forum / .NET Framework / Compact Framework / May 2008IsNumeric validation Compact Framework 2.0
Hi, are there any function in C# to validate that the value from a textbox to be numeric ? Thanks in advance. Depending on your needs, most of the Parse functions would work: int myval = int.Parse(textBox.Text); float myval = float.Parse(textBox.Text); etc.  SignatureChris Tacke, Embedded MVP OpenNETCF Consulting Giving back to the embedded community http://community.OpenNETCF.com > Hi, are there any function in C# to validate that the value from a textbox > to be numeric ? > > Thanks in advance. Thanks Chirs for your reply, but Parse doesn´t return true or false.... it returns an expection.... I need to get a bool value... > Depending on your needs, most of the Parse functions would work: > [quoted text clipped - 7 lines] >> >> Thanks in advance. 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. SignatureChris Tacke, Embedded MVP OpenNETCF Consulting Giving back to the embedded community http://community.OpenNETCF.com > Thanks Chirs for your reply, but Parse doesn´t return true or false.... it > returns an expection.... [quoted text clipped - 11 lines] >>> >>> Thanks in advance. 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 >I see. That's way more complex then. > [quoted text clipped - 22 lines] >>>> >>>> Thanks in advance. > 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. No TryParse in CF :-( HTH, Serge. http://www.apptranslator.com - Localization tool for your applications On May 8, 7:46 am, "Malani Czornon" <pus...@aol.com> wrote: > 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. Hi, Maybe creating your own control which inherits from TextBox and only allows to input a number value or digit? Dav > Hi, are there any function in C# to validate that the value from a textbox > to be numeric ? > > Thanks in advance. 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.inputmodeedito r.setinputmode.aspx Hope this helps, Cheers, Arun On May 9, 3:21 am, davebythesea <davebythe...@discussions.microsoft.com> wrote: > Hi, > [quoted text clipped - 9 lines] > > - Show quoted text - 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 > May be something like this > [quoted text clipped - 42 lines] > > - Show quoted text - Thanks a lot to all!! I´ll search the best way to do it. 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 > May be something like this > [quoted text clipped - 46 lines] > > - Show quoted text - Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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