public FourBandResistorCalculator(IFourColorCodeBandsViewModel colorCodeBandsViewModel) =>
public IActionResult Calculate(string bandAColor, string bandBColor, string bandCColor, string bandDColor
, [FromServices] IOhmValueCalculator fourBandResistorCalculator
, [FromServices] IFourColorCodeBandsViewModel fourColorCodeBandsViewModel) =>
Json(fourBandResistorCalculator.CalculateOhmValue(bandAColor, bandBColor, bandCColor, bandDColor)
.ToFormattedOhms(bandDColor, fourColorCodeBandsViewModel));
public static string ToFormattedOhms(this decimal?decimalValue, string bandDColor, IFourColorCodeBandsViewModel fourColorCodeBandsViewModel)
{
// if no value then just return null
if (!decimalValue.HasValue)
{
return(null);
}
// if there is no selected bandDColor, then just return default of plus minus 20%
if (string.IsNullOrWhiteSpace(bandDColor))
{
return(string.Concat(decimalValue.ToFormattedDecimalString(), WhiteSpaceString, OhmsString, WhiteSpaceString, TwentyPercentPlusMinusToleranceString));
}
// try to get band D color from input; if not found, then throw exception since the user tried to submit -- this should not occur
var bandDcolor = fourColorCodeBandsViewModel.BandDAvailableColors.FirstOrDefault(x => string.Equals(x.Name, bandDColor, StringComparison.OrdinalIgnoreCase));
if (bandDcolor == null)
{
throw new InvalidOperationException($"{bandDColor} is not an available color for Band D.");
}
// return the fully formatted string
return(string.Concat(decimalValue.ToFormattedDecimalString(), WhiteSpaceString, OhmsString, WhiteSpaceString, bandDcolor.Tolerance.Value.ToString(PercentFormatString)));
}
public IActionResult Index([FromServices] IFourColorCodeBandsViewModel viewModel) => View(viewModel);