Re: [aus-dotnet] IsDate function

[Shane Norris]

That sounds like a black smudge against the exceptions way of error
handling to me. In the olden days of error codes there would be no
questions about passing something through a parser and if it succeeded
then it was valid. It just seems a little broken to me that you should
have to write your own mini parser to see if its gonna make it through
the real deal. - Not that I don't prefer try/catch in my code instead
of the old way of if/then/else/if/then/if/else/else/if/...

 anyhow just an observation... Shane


On Tue, 21 Sep 2004 16:38:52 +1000, jmplun <jmplun@xxxxxxxxxxxxxx> wrote:
> Actually it is very bad form to use an exception to determine whether
> something is a date or not.
> For one thing it is a lot slower than doing a comparison.
> Another, exceptions are for just that, if you are doing a check to see
> if something is a date or not, then it shouldn't be an exception.
> 
> Look at regExp and use that to identify a valid date
> E.g.
> 
> http://www.google.com/search?hl=en&ie=UTF-8&q=regexp+.Net+date
> 
> Jarrad
> 
> 
> 
> -----Original Message-----
> From: dotnet-owner@xxxxxxxxxxx [mailto:dotnet-owner@xxxxxxxxxxx] On
> Behalf Of Sean Malloy
> Sent: Tuesday, September 21, 2004 4:24 PM
> To: 'dotnet@xxxxxxxxxxx'
> Subject: RE: [aus-dotnet] IsDate function
> 
> > This is very slow if the input param is null
> 
> if the input param being null makes it slow, why don't you place a check
> for that first, if null return false or something?
> 
> C# version (yelch VB)
> 
> bool IsDate(string input)
> {
>        if (input == null || input.Length == 0)
>                return false;
> 
>        try
>        {
>                DateTime.Parse(input);
>                return true;
>        }
>        catch (FormatException)
>        {
>                return false;
>        }
> }
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> 
> 
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