Can anyone explain this behaviour?
var culture = new CultureInfo("da-DK");
Thread.CurrentThread.CurrentCulture = culture;
"daab".StartsWith("da"); //false
I know that it can be fixed by specifying StringComparison.InvariantCulture. But I'm just confused by the behavior.
I also know that "aA" and "AA" are not considered the same in a Danish case-insensitive comparision, see http://msdn.microsoft.com/en-us/library/xk2wykcz.aspx. Which explains this
String.Compare("aA", "AA", new CultureInfo("da-DK"), CompareOptions.IgnoreCase) // -1 (not equal)
Is this linked to the behavior of the first code snippet?
Like Nappy said, its a feature of the danish language, where "aa" and "å" is still the same. Danish got another two letters, æ and ø, but I am not sure if they can be written using two letters as well.
I think in the second example "aA" is not changed while "AA" is changed to "Å". Just to confuse things even more, "Aa" is considered equal to "AA" and "aa" only when using case-insensitive comparing.