public static FileFormat GetFileFormatNoUnknown(FilePath imageFilePath, IStringlyTypedPathOperator stringlyTypedPathOperator)
{
var fileFormat = ImageFileFormatOperator.GetFileFormatAllowUnknown(imageFilePath, stringlyTypedPathOperator);
if (fileFormat == FileFormat.Unknown)
{
var fileExtension = stringlyTypedPathOperator.GetFileExtension(imageFilePath.Value);
var message = EnumerationHelper.UnrecognizedEnumerationValueMessage <FileFormat>(fileExtension);
throw new Exception(message);
}
return(fileFormat);
}