private static CatCommandLineOptions ParseOptions(CommandLineOptions commandLineOptions) { if (commandLineOptions == null) { throw new CommandLineException(string.Format(CultureInfo.CurrentCulture, "Option used in invalid context -- {0}", "must specify a option.")); } CatCommandLineOptions targetOptions = new CatCommandLineOptions(); if (commandLineOptions.Arguments.Count >= 0) { foreach (var arg in commandLineOptions.Arguments.Keys) { CatOptionType optionType = CatOptions.GetOptionType(arg); if (optionType == CatOptionType.None) { throw new CommandLineException( string.Format(CultureInfo.CurrentCulture, "Option used in invalid context -- {0}", string.Format(CultureInfo.CurrentCulture, "cannot parse the command line argument : [{0}].", arg))); } switch (optionType) { case CatOptionType.InputFile: targetOptions.InputFile = commandLineOptions.Arguments[arg]; break; case CatOptionType.LineNumber: targetOptions.IsSetLineNumber = true; break; case CatOptionType.Help: targetOptions.IsSetHelp = true; break; case CatOptionType.Version: targetOptions.IsSetVersion = true; break; } } } if (commandLineOptions.Parameters.Count > 0) { if (string.IsNullOrEmpty(targetOptions.InputFile)) { targetOptions.InputFile = commandLineOptions.Parameters.First(); } } return(targetOptions); }