Asp.Net /C# when is Å equal to A? (and É equal to E)

Question

i'm paging countries in an alfabet, so countries starting A-D, E-H etc. But i also want to list åbrohw at the a, and ëpollewop at the e. I tried string.startswith providing a stringcompare option, but it doesn't work...

i'm running under the sv-SE culture code, if that matters...

Michel

Isn't "How to remove diacritic marks from characters" a better title? Just suggesting this, don't want to modify a good title into something slightly better. — Wim ten Brink, Sep 15 '09 at 14:31

score 6 · Accepted Answer · edited May 23 '17 at 10:09

6

See How do I remove diacritics (accents) from a string in .NET? for the solution to create a version without the diacritics, which you can use for the comparisons (while still displaying the version with the diacritics).

edited May 23 '17 at 10:09

Community

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answered Sep 15 '09 at 14:30

bdukes

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score 4 · Answer 2 · answered Sep 15 '09 at 14:31

Oh yes, the culture matters. If you run the following:

List<string> letters = new List<string>() { "Å", "B", "A" };

Thread.CurrentThread.CurrentCulture = CultureInfo.GetCultureInfo("sv-SE");
letters.Sort();
Console.WriteLine("sv-SE:")
letters.ForEach(s => Console.WriteLine(s));   

Thread.CurrentThread.CurrentCulture = CultureInfo.GetCultureInfo("en-GB");
letters.Sort();
Console.WriteLine("en-GB:")
letters.ForEach(s => Console.WriteLine(s));

...you get the following output:

sv-SE:
A
B
Å
en-GB:
A
Å
B

+1 as I was going to answer - just use a culture that considers "A" and "Å" to be the same letter. — Rex M, Sep 15 '09 at 14:37

score 1 · Answer 3 · answered Sep 15 '09 at 14:27

1

Try using range selection instead of precise matching.

A: (firstLetter <= A)
B: (firstLetter > A) AND (firstLetter <= B)
...

answered Sep 15 '09 at 14:27

score 1 · Answer 4 · answered Sep 15 '09 at 14:29

You would have to give a specific culture for sorting or write your own comparer for that. Default sorting order for Swedish puts å, ä, ö at the end.

Most likely you would like to decompose letters with diacritics and sort them as if they wouldn't have a diacritic mark.

Asp.Net /C# when is Å equal to A? (and É equal to E)

4 Answers4