CA1305 fxcop for String Interpolation on .NET 4.5

[saxenark]

VS2015

$"Enabled Check for {feature.ToString()}"

This code shows the following warning on Code Analysis

Warning CA1305 Because the behavior of 'string.Format(string, object)' could vary based on the current user's locale settings, replace this call in 'FeatureController.IsFeatureEnabled(FeatureEnum, Dictionary<string, string>)' with a call to 'string.Format(IFormatProvider, string, params object[])'. If the result of 'string.Format(IFormatProvider, string, params object[])' will be displayed to the user, specify 'CultureInfo.CurrentCulture' as the 'IFormatProvider' parameter. Otherwise, if the result will be stored and accessed by software, such as when it is persisted to disk or to a database, specify 'CultureInfo.InvariantCulture'.

Question is, how do I handle this warning in .NET 4.5 while sticking with string interpolation. I know 4.6 does have FormattableString which can help resolve this warning.

[haakoo]

I'm also seeing this warning for code where I don't understand why. The following code results in this warning when compiled for .Net Framework 4.6.1

public static class Class1
{
    public static string Method(string someValue)
    {
        return $"A string with {someValue} embedded in it.";
    }
}

Warning CA1305 Because the behavior of 'string.Format(string, object)' could vary based on the current user's locale settings, replace this call in 'Class1.Method(string)' with a call to 'string.Format(IFormatProvider, string, params object[])'. If the result of 'string.Format(IFormatProvider, string, params object[])' will be displayed to the user, specify 'CultureInfo.CurrentCulture' as the 'IFormatProvider' parameter. Otherwise, if the result will be stored and accessed by software, such as when it is persisted to disk or to a database, specify 'CultureInfo.InvariantCulture'. NetFramework

Why get a warning when you embed a string? Is this a bug in the analyser, or am I missing something?

Working minimal example over at haakoo/WarningCA1305Bug.

[mavasani]

This is a dupe of dotnet/roslyn#8884 (comment)