IPAddress

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Mark Cooper - 30 Sep 2005 17:45 GMT

Hi

Is there a class with a method in the .NET Framework that will verify if a
string is in the correct dotted format to be an IPAddress. Similar to
inet_addr

nnn.nnn.nnn.nnn

Thank You
Mark

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Jon Skeet [C# MVP] - 30 Sep 2005 17:50 GMT

> Is there a class with a method in the .NET Framework that will verify if a
> string is in the correct dotted format to be an IPAddress. Similar to
> inet_addr
>
> nnn.nnn.nnn.nnn

Have you tried IPAddress.Parse?

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Mark Cooper - 30 Sep 2005 18:20 GMT

Yes but I was hoping to check the string without having to add the overhead
of an exception. The majority of the time it will be a DNS host name not an
IP address.

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Jon Skeet [C# MVP] - 30 Sep 2005 18:46 GMT

> Yes but I was hoping to check the string without having to add the overhead
> of an exception. The majority of the time it will be a DNS host name not an
> IP address.

When you talk about the overhead of the exception, just how many of
these are you doing? See
http://www.pobox.com/~skeet/csharp/exceptions.html

It would be reasonably easy to hard-code a test, and feasible to do as
a regular expression (the tricky bit is rejecting 300.300.300.300 but
allowing 30.30.30.255 etc). The *simplest* way is probably to use
IPAddress.Parse though. Whether this counts as an abuse of exceptions
is a matter of taste IMO. Note that in .NET 2 you'll be able to use
IPAddress.TryParse, which is much more what you're after.

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Jon Skeet - <skeet@pobox.com>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
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Kevin Spencer - 30 Sep 2005 21:53 GMT

The 2.0 Platform has a TryParse for the IPAddress, and a number of other
classes as well. It doesn't throw an exception. Unfortunately, the 1.1
platform does not.

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HTH,

Kevin Spencer
Microsoft MVP
.Net Developer
Big things are made up of
lots of little things.

>> Yes but I was hoping to check the string without having to add the
>> overhead
[quoted text clipped - 12 lines]
> is a matter of taste IMO. Note that in .NET 2 you'll be able to use
> IPAddress.TryParse, which is much more what you're after.

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