Converting input strings to integers

"Russell Jones" <arj1@northstate.net> wrote:
>Look at the various integer types' Parse method. Or see the Convert.ToInt32
>method (also see Convert to convert to other integer types). Or feel free
to
>import the VB namespace and use CInt (and other VB commands) directly.
>
>"Dave" <dave_doknjas@yahoo.ca> wrote in message
>news:3f319a37$1@tnews.web.dev-archive.com...
>>
>> Is there a standard .NET way to convert input strings to their closest
>integer
>> equivalent? In VB.NET I basically do a "CInt" and it takes care of most
of
>> the problem (except for null values).
>>
>> My first (pathetic non-working) attempt is the following - it currently
>fails
>> on non-numeric input or non-integer numbers. Am I totally out to lunch?
Or
>> will I need to convert to a char array and look at each character, etc?
>I'm
>> willing to methodically go through that process, so I don't expect anyone
>> to write that code for me, but I have a hunch I'm going down the wrong
>track
>> on this. And of course I've named it "CInt" as any VB diehard would have
>> done :)
>>
>> public static int CInt(object oValue)
>> {
>> if (oValue == null || System.Convert.IsDBNull(oValue))
>> {
>> //default null to 0:
>> return 0;
>> }
>>
>> string sString = oValue.ToString().Trim();
>> if (sString == "")
>> {
>> //default empty string to 0:
>> return 0;
>> }
>>
>> return int.Parse(sString, NumberStyles.Any);
>> }
>>
>
I'm currently using the int type's Parse method from within my routine, but
the problem is (and also with the Convert namespace) is that I'll have to
resort to catching exceptions in this process and I'd rather not do that
as part of normal logic.

Import the VB namespace? *** GASP ***
Ok, maybe, if I have to.

"Len Weaver" <len.weaver@meritsoft.net> wrote:
>Hello Dave,
>
>> Is there a standard .NET way to convert input strings to their closest
>integer
>> equivalent? In VB.NET I basically do a "CInt" and it takes care of
>most of
>> the problem (except for null values).
>
> Try the static Double.TryParse method.
>
>using System.Globalization;
>
>bool success;
>int intValue;
>double doubleValue;
>string x = "1234";
>
>success = Double.TryParse( x, NumberStyles.Integer,
> CultureInfo.CurrentCulture,
> out doubleValue )
>
>if( success ) intValue = (int)doubleValue;
>
> If it can't perform the conversion it will return false, which is
>better than throwing an exception.
>
>Hope this helps,
>Len
>
>
Perfect!! Thanks Len!
I couldn't find anything relevant for the int type, so I didn't even bother
to look at the double type. This is exactly the kind of thing I was looking
for.

You could also use the IsNumeric method, but that would also require importing VB.