Specifiy CultureInfo ?

[StefH]

It seems that the writer used in:

handlebarsContext.RegisterHelper(name, (writer, context, arguments) =>
// and
handlebarsContext.RegisterHelper(name, (writer, options, context, arguments) =>

Is always using the current culture ? Is there a way to change this?

[oformaniuk]

You can try to use Action<TextWriter, object> Compile(TextReader template) overload and pass TextWriter with configured IFormatProvider.
Passed TextWriter should then be used in helpers.

[StefH]

@zjklee Thanks for your idea.

At this moment, I solved this by adding extensions method to TextWriter, see this code:
https://github.com/StefH/Handlebars.Net.Helpers/blob/master/src/Handlebars.Net.Helpers/Extensions/TextWriterExtensions.cs