Char.IsLetter returns True for masculine ordinal character

Char.IsLetter returns True for masculine ordinal character by AlchemistMatt

Closed

as By Design Help for as By Design

Type:	Bug
ID:	773980
Opened:	12/10/2012 5:24:35 PM
Access Restriction:	Public

Workaround(s)

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User(s) can reproduce this bug

I have found that Char.IsLetter() returns True for the masculine ordinal character, described at http://en.wikipedia.org/wiki/Ordinal_indicator. The Char.GetUnicodeCategory() function reports it is a LowercaseLetter, but I would think it should be reported as a symbol. I have tested this in both .NET 4.0 and .NET 4.5.

Of course, this could be "by design"; I'll let you respond.

Details (expand)

.NET Framework 4.5

Run this code (note that you need to enter the ordinal indicator in the first two commands, not the degree sign).

' Ordinal Indicator
Console.WriteLine(Char.IsLetter("º"c))
Console.WriteLine(Char.GetUnicodeCategory("º"c).ToString)

' Degree Sign
Console.WriteLine(Char.IsLetter("°"c))
Console.WriteLine(Char.GetUnicodeCategory("°"c).ToString())

English

Windows 7

English

Running the above code returns "True" and "LowercaseLetter" for the ordinal indicator. It returns "False" and "OtherSymbol" for the degree sign.

Running the above code should return "False" and "OtherSymbol" for both symbols.

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Posted by Microsoft on 2/21/2013 at 7:49 AM

Thank you for your feedback. This issue is actually by-design.

We are following the Unicode standard. It defined Lo (Other_Letter) as lowercase.

Regards,
Immo Landwerth
.NET Framework team

Posted by Microsoft on 12/10/2012 at 8:32 PM

Thanks for your feedback.

We are rerouting this issue to the appropriate group within the Visual Studio Product Team for triage and resolution. These specialized experts will follow-up with your issue.

Posted by Microsoft on 12/10/2012 at 5:51 PM

Thank you for your feedback, we are currently reviewing the issue you have submitted. If this issue is urgent, please contact support directly(http://support.microsoft.com)