Is there a GUID.TryParse() in .NET 3.5?

Question

UPDATE

Guid.TryParse is available in .NET 4.0

END UPDATE

Obviously there is no public GUID.TryParse() in .NET CLR 2.0.

So, I was looking into regular expressions [aka googling around to find one] and each time I found one there was a heated argument in the comments section about RegEx A doesn't work, use RegEx B. Then someone would write Regex C yadda yadda

So anyway, What I decided to do was this, but I feel bad about it.

public static bool IsGuid (string possibleGuid) {

    try {
      Guid gid = new Guid(possibleGuid);
      return true;    
    } catch (Exception ex) {
      return false;
    }
}

Obviously I don't really like this since it's been drilled into me since day one to avoid throwing exceptions if you can defensibly code around it.

Does anyone know why there is no public Guid.TryParse() in the .NET Framework?

Does anyone have a real Regular Expression that will work for all GUIDs?

Answer 1

There is no Guid.TryParse in CLR 2.0 and earlier. It will be available starting with CLR 4.0 and Visual Studio 2010.

As to why there wasn't. These types of questions are usually hard to answer correctly. Most likely it was an oversight or a time constraint issue. If you open up mscorlib in reflector you'll see there is actually a method named TryParse on Guid but it's private. It also throws an exception in certain cases so it's not a good equivalent to say Int32.TryParse.