KelvinMapperLookup.cs

KelvinMapperLookup.cs

services.AddSingleton<KelvinConverterMapper>(provider => key =>
{
    switch ((string.IsNullOrEmpty(key) ? " " : key).ToUpper()[0])
    {
        case 'C':
            return provider.GetRequiredService<CentigradeToKelvinMapper>();

        case 'F':
            return provider.GetRequiredService<FahrenheitToKelvinMapper>();

        case 'R':
            return provider.GetRequiredService<RankineToKelvinMapper>();

        case 'K':
            return provider.GetRequiredService<KelvinToKelvinMapper>();
        default:
            return null;
    }
});