Can't convert Text string to an int32 using Convert.Int32

[Convert TextBox.Text to Int32 Problem]

Need a little help here. I saw some related posts, so here goes... I have some textboxes which are designed for the user to enter a integer value. In "old school C" we just used the atoi function and there you have it. So I enquired and found the Convert class with it's promising ToInt32 method, great... but it doesn't work. The thing keeps throwing Format Exceptions all over the place. What is the "C#" way to do this??? code

int wmin, wsec, x
int hrs, min, sec, miles
miles = Convert.ToInt32 (txtMiles.text)
hrs = Convert.ToInt32 (txtHours.text)
min = Convert.ToInt32 (txtMinutes.tex t)
sec = Convert.ToInt32 (txtSeconds.tex t)
. .

I even tried forcing the values to string by using .... miles = Convert.ToInt32 (txtMiles.text. ToString())
still not working...
Help!

[Justin Rogers]

Re: Can't convert Text string to an int32 using Convert.Int32

The property should be .Text for one. And if the conversion can't take place a
FormatException
is expected. You can try using double.TryParse instead and converting to an
integer. There are
other methods as well (Whidbey has an int.TryParse), and I've developed a
library that does
what you are looking for:

http://weblogs.asp.net/justin_rogers/articles/104504.aspx

--
Justin Rogers
DigiTec Web Consultants, LLC.
Blog: http://weblogs.asp.net/justin_rogers

"Convert TextBox.Text to Int32 Problem" <chris.stueck@c enterpointenerg y.com>
wrote in message news:1F83AE18-14D7-4516-9412-684C829D32B6@mi crosoft.com...[color=blue]
> Need a little help here. I saw some related posts, so here goes... I have[/color]
some textboxes which are designed for the user to enter a integer value. In
"old school C" we just used the atoi function and there you have it. So I
enquired and found the Convert class with it's promising ToInt32 method,
great... but it doesn't work. The thing keeps throwing Format Exceptions all
over the place. What is the "C#" way to do this??? code:[color=blue]
>
> int wmin, wsec, x;
> int hrs, min, sec, miles;
> miles = Convert.ToInt32 (txtMiles.text) ;
> hrs = Convert.ToInt32 (txtHours.text) ;
> min = Convert.ToInt32 (txtMinutes.tex t);
> sec = Convert.ToInt32 (txtSeconds.tex t);
> . . .
>
> I even tried forcing the values to string by using .... miles =[/color]
Convert.ToInt32 (txtMiles.text. ToString());[color=blue]
> still not working....
> Help![/color]

[Jon Skeet [C# MVP]]

Re: Can't convert Text string to an int32 using Convert.Int32

Convert TextBox.Text to Int32 Problem
<chris.stueck@c enterpointenerg y.com> wrote:
[color=blue]
> Need a little help here. I saw some related posts, so here goes... I
> have some textboxes which are designed for the user to enter a
> integer value. In "old school C" we just used the atoi function and
> there you have it. So I enquired and found the Convert class with
> it's promising ToInt32 method, great... but it doesn't work. The
> thing keeps throwing Format Exceptions all over the place. What is
> the "C#" way to do this??? code:
>
> int wmin, wsec, x;
> int hrs, min, sec, miles;
> miles = Convert.ToInt32 (txtMiles.text) ;
> hrs = Convert.ToInt32 (txtHours.text) ;
> min = Convert.ToInt32 (txtMinutes.tex t);
> sec = Convert.ToInt32 (txtSeconds.tex t);
> . . .[/color]

If Convert.ToInt32 (string) is throwing an exception, then your text
presumably isn't a valid integer. Note that unlike atoi, which stops
when it meets the first non-numeric character and returns whatever it's
parsed so far, Convert.ToInt32 (string) and Int32.Parse both require the
whole string to be a valid integer value (although whitespace is
allowed, by default).

If you want to emulate atoi, you'll have to write a method to find the
leading substring of a string which is composed of digits (perhaps
prefixed with '-'), or "0" if such a string would have no digits in.
[color=blue]
> I even tried forcing the values to string by using .... miles =
> Convert.ToInt32 (txtMiles.text. ToString());[/color]

If it wasn't a string before, what was it? I would imagine it was
already a string - calling ToString() on a string isn't going to make
any difference.

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

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

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

[Chris Stueck]

Re: Can't convert Text string to an int32 using Convert.Int32

I went to the weblog.asp.net site. It looks great, how do I compile the library, are there any instructions?