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Version: 4.0 (next)

Choose explicit and ambient cultures

Pass a CultureInfo directly when an overload accepts one. It makes the language choice visible, keeps concurrent requests isolated, and is easy to test. Set CurrentCulture and CurrentUICulture together at a request, message, or job boundary for APIs that use ambient culture.

Culture names are .NET culture identifiers. A specific culture such as fr-FR can map to neutral fr locale data when that exact regional name is in Humanizer's generated accepted-culture inventory. Built-in registries use this generated map and do not walk arbitrary .NET parents. A caller-created LocaliserRegistry<TLocaliser> retains parent-chain fallback and uses its default only when no registered parent matches.

Example​

using System.Globalization;
using Humanizer;

var french = CultureInfo.GetCultureInfo("fr-FR");
Console.WriteLine(42.ToWords(french));

The output is quarante-deux.

Keep using explicit overloads inside shared services where possible; this prevents one concurrent operation from changing another operation's output.

Establish ambient culture at a boundary​

Some APIs use the ambient culture:

using System.Globalization;
using Humanizer;

var french = CultureInfo.GetCultureInfo("fr-FR");
CultureInfo.CurrentCulture = french;
CultureInfo.CurrentUICulture = french;

Console.WriteLine(42.ToWords());

The output is again quarante-deux.

Keep both ambient cultures consistent​

CurrentCulture and CurrentUICulture serve different .NET concerns, and Humanizer APIs can use either one. Setting only one can produce mixed-language output. Avoid changing ambient culture in a shared request path when an explicit overload exists.

Profile reuse is resolution, not parity proof. If an accepted fr-CA mapping reaches fr, that only identifies where the data came from. It does not establish that French Canadian wording matches every neutral-French choice.

Choose an application fallback​

Use Configurator.IsCultureSupported(culture) before choosing an application fallback. It checks the exact culture name against Humanizer's generated accepted-culture inventory and does not return true merely because an arbitrary parent or the default English localizers could produce output:

var requested = CultureInfo.GetCultureInfo("fr-FR");
var culture = Configurator.IsCultureSupported(requested)
    ? requested
    : CultureInfo.GetCultureInfo("en");

If inherited or direct output is wrong, follow the language correction guide or open a prefilled locale issue.