System.Globalization.CultureNotFoundException UnitsNet.ToString() on system that Culture information is not available

[PRIMETSS]

When .ToString() is called via DotNet #7 App on a UnitsNet Type on a system that either does not have Culture support with the
export DOTNET_SYSTEM_GLOBALIZATION_INVARIANT='1' environment variable set (required to run dotnet on PI) in Culture Invariant mode.

Unhandled exception. System.TypeInitializationException: The type initializer for 'UnitsNet.UnitAbbreviationsCache' threw an exception. ---> System.Globalization.CultureNotFoundException: Only the invariant culture is supported in globalization-invariant mode. See https://aka.ms/GlobalizationInvariantMode for more information. (Parameter 'name') en-US is an invalid culture identifier. at System.Globalization.CultureInfo..ctor(String name, Boolean useUserOverride) at UnitsNet.UnitAbbreviationsCache..cctor() --- End of inner exception stack trace --- at UnitsNet.UnitAbbreviationsCache.get_Default() at UnitsNet.UnitFormatter.GetFormatArgs[TUnitType](TUnitType unit, Double value, IFormatProvider culture, IEnumerable1 args)
at UnitsNet.QuantityFormatter.ToStringWithSignificantDigitsAfterRadix[TUnitType](IQuantity1 quantity, IFormatProvider formatProvider, Int32 number) at UnitsNet.QuantityFormatter.Format[TUnitType](IQuantity1 quantity, String format, IFormatProvider formatProvider)
at UnitsNet.Temperature.ToString(String format, IFormatProvider provider)
at UnitsNet.Temperature.ToString(String format)
at UnitsNet.Temperature.ToString()`

On OpenWRT SNAPShot (r22514) (Busybox Linux-musl ARM64) running on a Raspberry PI CM4 install latest DotNet SDK Version: 7.0.202 an ' System.Globalization.CultureNotFoundException' is thrown.

Expected behavior

string temp = sensorAht20.GetTemperature().ToString("F2")

Expected to return a 2 decimal places Temperature, eg '22.2' on system where Culture is not available.

https://learn.microsoft.com/en-us/dotnet/core/runtime-config/globalization

[tmilnthorp]

Thanks for the info. This is an oversight in our fallback mechanism.

@angularsen I wonder if #1210 would be the best fix here.

[angularsen]

@tmilnthorp Yes I think we can solve it as part of that feature, maybe make a note to test this scenario.

[aradalvand]

Same issue here.
Any time frame as to when #1210 is likely to be merged?

[pgrawehr]

@PRIMETSS Just curious: Why do you need that in the first place? Culture support works just fine on the Raspberry Pi (at least for me), so this setting seems unnecessary. Or is it the container you're using?

[PRIMETSS]

To get DotNet 7/8 (Core) runtime to currently function on OpenWRT Busybox musl-linux using package icu71 you need to set export DOTNET_SYSTEM_GLOBALIZATION_INVARIANT='1'

This package has now updated to icu72 recently, and have not checked if this removed that 'workaround' but from memory I think I still had same issue after.

[angularsen]

Will try to make some progress this weekend.

[angularsen]

A possible fix is merged in #1266 , it would be good if you have the chance to build it locally and try it out. I have a few other fixes before I'm ready to publish a new nuget.

[angularsen]

#1266 is out in Release UnitsNet/5.22.0 · angularsen/UnitsNet