OrderBy with Swedish letters

Question

I have a list of my custom class Customer and I want to sort them alphabetically by Title. So I wrote

myList = myList.OrderByDescending(x => x.Title).ToList<Customer>();

Now the problem is that this method doesn't support the Swedish way of sorting the letters å, ä, ö. They should appear at the end after the letter z but they don't.

So I made a workaround method that replaces the Swedish letters before the ordering and then changes them back afterwords. It looks like this but it is quite slow. Can somebody think of a better way?

private List<Customer> OrderBySwedish(List<Customer> myList)
    {
        foreach (var customer in myList)
        {
            customer.Title = customer.Title.Replace("å", "zzz1").Replace("ä", "zzz2").Replace("ö", "zzz3").Replace("Å", "Zzz1").Replace("Ä", "Zzz2").Replace("Ö", "Zzz3");
        }

        myList= myList.OrderBy(x => x.Title).ToList<Customer>();

        foreach (var customer in myList)
        {
            customer.Title = customer.Title.Replace("zzz1", "å").Replace("zzz2", "ä").Replace("zzz3", "ö").Replace("Zzz1", "Å").Replace("Zzz2", "Ä").Replace("Zzz3", "Ö");
        }
        return myList;
    }

Answer 1

You can use culture specific StringComparer , see here .

CultureInfo culture = new CultureInfo("sv-SE");
var result = myList.OrderByDescending(x => 
               x.Title, StringComparer.Create(culture, false));

Answer 2

将Thread.CurrentCulture属性设置为正确的区域性。

Answer 3

I my case: _My sorting list have value was encoded. This make my order incorrect. Add decoded solving my problems !

Answer 4

The workaround I found for a somewhat similar problem was to have a secondary field that held the converted version of the data.
In my case, we had person.Name and person.SearchName , where SearchName was Name converted to have no diacritics.

But this was only the best approach (AFAIK) because we wanted a speedy db search/filtering and then instantiating only the relevant results.
If you already have the objects in memory I would advise going with one of the other approaches; and not this one.