BaseConvert method should handle negative integers and throw exception when wrong data supplied

[AlexOldest]

Test block:
//.....
string s = null;
try
{
s = StringExtensions.BaseConvert("-212", 3, 10);
WriteLine(s);
s = StringExtensions.BaseConvert("312", 3, 10);
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
//.....

[mythz]

Hi Alex,

Cheers for this, can you approve the Contributor License Agreement so we can merge this, thx.

Could you resend this PR without using C# 6 syntax and to use spaces instead of tabs to stick to the existing code style so that the diffs can show exactly what's changed, thx.

[AlexOldest]

Hi Demis,
Thank you for your response. I am new to GitHub but appreciate it very much.
I also appreciate your skill and efforts in creating and supporting ServiceStack.Text library. I intend to learn and use it as a primer when teaching students.
Help me, I have made a change to my first commit, but can't find out how to push it up.

[AlexOldest]

I think that it would be easier to attach a new version of StringExtensions.BaseConvert extension-method
BaseConvert.txt

[mythz]

Hi Alex,

No worries I just applied the changes manually in this commit: b06246a

You can get this change on v4.0.47 MyGet pre-release packages now, or you can wait till tomorrow when we should be deploy the next v4.0.48 official release to NuGet.