private static Stream GetFileOrThrow(List <CsvFileDto> packageFiles, CovidStatisticsFileName fileName)
{
var retVal = packageFiles.SingleOrDefault(x => x.Name == fileName)?.File ??
throw new CovidStatisticsParsingFileNotFoundException(fileName);
return(retVal);
}
public CovidStatisticsParsingFileNotFoundException(CovidStatisticsFileName name)
: base(String.Format("Could not find file with name: {0}", name))
{
}