String sort change in .NET 5.0

[RussKie]

Running the following sample yields different results in .NET 5.0 compared to .NET Framework and .NET Core:

List<string> list = new List<string>() { "current/2", "current_2" };
list.Sort();

foreach (string s in list)
{
	Console.WriteLine(s);
}

.NET Framework / .NET Core:

current/2
current_2

.NET 5.0:

current_2
current/2

@GrabYourPitchforks is this known? I've searched through the repo but couldn't find anything obvious.

[gfoidl]

See Globalization APIs use ICU libraries on Windows and the issues here regarding ICU.

[RussKie]

Thank you, I kind of suspected it may be related.

[GrabYourPitchforks]

@gfoidl's answer is correct. By default, string.CompareTo (used by List<T>.Sort) defaults to the linguistic StringComparer.CurrentCulture. I don't know much about your scenario, but I suspect you probably wanted a non-linguistic comparer. Try calling List<T>.Sort(IComparer<T>) and pass StringComparer.Ordinal or StringComparer.OrdinalIgnoreCase if you want non-linguistic behavior.

(Note: using StringComparer, not the StringComparison enum.)

[RussKie]

Thank you