[Wasm] CultureInfo isn't correctly constructed

[pranavkm]

var culture = new CultureInfo("fr-FR");
while (true)
{
    Console.WriteLine($"{culture.Name}: {culture.DisplayName}");
    if (culture == CultureInfo.InvariantCulture)
    {
        break;
    }
    culture = culture.Parent;
}

Output in .NET Core:

fr-FR: French (France)
fr: French
: Invariant Language (Invariant Country)

Output in WASM:

fr-FR: Invariant Language (Invariant Country)
 : Invariant Language (Invariant Country)

The important bit here is that the parent culture (fr) is missing. This affects resx file lookups.

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[pranavkm]

/cc @marek-safar @lewing @mkArtakMSFT

[safern]

I think this is still using wasm globalization implementation in mono right? Not using ICU but Invariant implementation.

[pranavkm]

I'm not a 100% certain. Feel free to untag System.Globalization until they've had a chance to triage this.

[tarekgh]

This looks to me wasm is using the invariant globalization mode which forcing Invariant culture data for all created cultures.

[safern]

Right, so if we ran the same code with Invariant enabled on .NET5.0 we would get the same behavior as on WASM.

[marek-safar]

That's expected and was discussed on the syncs. We are forcing Globalization Invariant Mode for now.