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https://issues.apache.org/jira/browse/LUCENENET-420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13040712#comment-13040712
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Digy commented on LUCENENET-420:
--------------------------------
> because it thinks that "aa" is "å"
In my test case, "Gaard".StartsWith("Gå") also returns false.
I am still not sure, whether it is a Lucene.Net bug, or something that should
be handled by the user.
I'll think about it.
DIGY
> String.StartsWith has culture in it.
> ------------------------------------
>
> Key: LUCENENET-420
> URL: https://issues.apache.org/jira/browse/LUCENENET-420
> Project: Lucene.Net
> Issue Type: Bug
> Components: Lucene.Net Core
> Affects Versions: Lucene.Net 2.9.2, Lucene.Net 2.9.4, Lucene.Net 3.x
> Environment: .NET under (at least) da-DK culture
> Reporter: Niels Kühnel
> Fix For: Lucene.Net 2.9.2, Lucene.Net 2.9.4, Lucene.Net 3.x
>
> Original Estimate: 4h
> Remaining Estimate: 4h
>
> I've been hunting a weird bug for a long time. I finally found it's cause.
> I'm Danish, thus my .NET culture is "da-DK". In this culture "Gaard", doesn't
> start with "Ga" because it thinks that "aa" is "å" (in Danish it was before
> 1948).
> That gives some unexpected results when doing prefix queries.
> The solution is to add StringComparison.InvariantCulture in all StartsWith
> comparisons.
> To verify my claim, try running:
> Thread.CurrentThread.CurrentCulture = CultureInfo.GetCultureInfo("da-DK");
> Assert.IsFalse("Gaard".StartsWith("Ga"));
> Assert.IsTrue("Gaard".StartsWith("Ga", StringComparison.InvariantCulture));
> Cheers,
> Niels Kühnel
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